recommended sealants, gaskets, and tapes · forth in the tables below. typical product data values...

Type Manufacturer Product Names

3MSt. Paul, MN

1.800.831.0658Vent Tape

General Electric CompanyHuntersville, NC1.866.275.4372

Pecora CorporationHarleysville, PA800.523.6688

Silicone

GE SilPruf® SCS2700

GE SilPruf® SCS2000

Pecora 895 NST

Tape 394

Tape 3294

Tape 440 TapeTremco

Ashland, OH800.321.6357

TremcoAshland, OH800.321.6357

Gasket

Silicone DenseRubber Extrusions -

70 Durometer

EPDM DenseRubber Extrusions

RecommendedSealants, Gaskets, and Tapes

for Polycarbonate

We recommend verifying your sealant, gasket, or tape choice with your project manager to ensure that it will meet your speci�c project needs.

260 Hudson River Road [email protected] GE is a registered trademark of General Electric Company and is used Waterford, NY 12188 siliconeforbuilding.com under license by Momentive Performance Materials Inc. Rev. 020719

Silicone Sealant for Plastic Applications Information on GE SilPruf* SCS2700 Low-Modulus Silicone Sealant SCS2700 is a versatile, ready-to-use single-component silicone sealant that offers more flexibility than is available in most typical sealants passing with up to +100% movement in extension and -50% movement in compression via the ASTM C719 cyclic fatigue movement ability test. It is useful in a variety of sealing, bonding and weatherproofing applications and especially notable is the low-modulus (softer and more flexible) characteristic of the cured silicone rubber which does not appreciably harden nor soften from -40°C/°F to 120°C/250°F. This soft adhesive is particurlarly helpful for bonding dissimilar materials with differing coeffecients of thermal expansion (CTEs) and moreso for plastic materials which have significantly higher CTEs than many other materials. Commercialized in 1999, this product is formulated with 100% silicone polymer, is inherently UV resistant and needs no special precautions against freeze/thaw, salt water, natural weathering or direct sunlight and will not crack, split or harden over time. SCS2700 can be applied in temperatures below freezing for winter repair projects and on surfaces up to 35°C/122°F in summer conditions. Instructions for surface preparation, use and installation can be found on the product datasheet; see www.siliconeforbuildign.com

Compatibility SCS2700 is tested as compatible to polycarbonate and does not lend to stress crazing or cracking of these materials.

Available Colors SCS2700 is available in 8 standard colors including white, black and 3 shades of grey. For a full list of color options see www.siliconeforbuilding.com and navigate to the SCS2700 landing page or product datasheet.

260 Hudson River Road [email protected] GE is a registered trademark of General Electric Company and is used Waterford, NY 12188 siliconeforbuilding.com under license by Momentive Performance Materials Inc. Rev. 020719

Suitable Substrates SCS2700 attains primerless bonds to, and is compatible with the following materials: Material Also known as Adhesion Comments Acrylonitrile Butadiene Styrene ABS, CYCOLAC™ primerless 10457 Acrylonitrile Styrene Acrylate ASA/PC, Geloy* primerless 07626 Chlorinated Polyvinyl Chloride CPVC primerless 06591, 10320 Expanded Polyvinyl Chloride Sintra primerless 10320 High-density Polyethylene HDPE SS80 primer 10320 Modified Polyphenylene Oxide PPO, NORYL™ test SS80 Polybutylene Terephthalate PBT, VALOX™ primerless 10320 Polyethylene Terephthalate PETG, PET primerless 06591 Polycarbonate, plain Makrolon®, Lexan* primerless Compatible, 10272 Polycarbonate, coated for UV resist Makrolon®, Lexan* primerless Compatible, 10272 Polycarbonate, coated for mar-resist Makrolon®, Lexan* primerless Compatible, 10290 Poly(methyl methacrylate) PMMA acrylic, Plexiglas, Lucite primerless 06591 Polystyrene PS primerless 10320 Polyvinyl chloride PVC, vinyl (rigid) primerless 06591, 07099, 10294 Polyetherimide Resins PEI, ULTEM™ test SS80 Polyester/Fiberglass composites Gel Coat primerless Vinylester/Fiberglass composites Gel Coat primerless Epoxy/Fiberglass composites Gel Coat primerless THE MATERIALS, PRODUCTS AND SERVICES OF MOMENTIVE PERFORMANCE MATERIALS INC. AND ITS SUBSIDIARIES AND AFFILIATES (COLLECTIVELY “SUPPLIER”), ARE SOLD SUBJECT TO SUPPLIER’S STANDARD CONDITIONS OF SALE, WHICH ARE INCLUDED IN THE APPLICABLE DISTRIBUTOR OR OTHER SALES AGREEMENT, PRINTED ON THE BACKOF ORDER ACKNOWLEDGMENTS AND INVOICES, AND AVAILABLE UPON REQUEST. ALTHOUGH ANY INFORMATION, RECOMMENDATIONS, OR ADVICE CONTAINED HEREIN IS GIVEN IN GOOD FAITH, SUPPLIER MAKES NO WARRANTY OR GUARANTEE, EXPRESS OR IMPLIED, (i) THAT THE RESULTS DESCRIBED HEREIN WILL BE OBTAINED UNDER END- USE CONDITIONS, OR (ii) AS TO THE EFFECTIVENESS OR SAFETY OF ANY DESIGN INCORPORATING ITS PRODUCTS, MATERIALS, SERVICES, RECOMMENDATIONS OR ADVICE. EXCEPT AS PROVIDED IN SUPPLIER’S STANDARD CONDITIONS OF SALE, SUPPLIER AND ITS REPRESENTATIVES SHALL IN NO EVENT BE RESPONSIBLE FOR ANY LOSS RESULTING FROM ANY USE OF ITS MATERIALS, PRODUCTS OR SERVICES DESCRIBED HEREIN. Each user bears full responsibility for making its own determination as to the suitability of Supplier’s materials, services, recommendations, or advice for its own particular use. Each user must identify and perform all tests and analyses necessary to assure that its finished parts incorporating Supplier’s products, materials, or services will be safe and suitable for use under end- use conditions. Nothing in this or any other document, nor any oral recommendation or advice, shall be deemed to alter, vary, supersede, or waive any provision of Supplier’s standard Conditions of Sale or this Disclaimer, unless any such modification is specifically agreed to in a writing signed by Supplier. No statement contained herein concerning a possible or suggested use of any material, product, service or design is intended, or should be construed, to grant any license under any patent or other intellectual property right of Supplier covering such use or design, or as a recommendation for the use of such material, product, service or design in the infringement of any patent or other intellectual property right.

SCS2000 SilPruf *Silicone Sealant & Adhesive

GE Silicones Technical Data SheetFOR INDUSTRIAL USE ONLY

Product Description

GE SCS2000 is a one-component, high-strength, neutral cure silicone sealant & adhesive for use in structural glazing and on a wide variety of materials in new or remedial weatherproofing applications. SCS2000 sealant is supplied as a paste and upon cure, produces a durable, formed-in-place silicone rubber joint sealant.

Key Features and Typical Benefits

Performance• Silicone Durability—Cured silicone rubber exhibits excellent

long term resistance to natural weathering including: extreme temperatures, ultraviolet radiation, rain and snow, with negligible change in elasticity.

• Strength Properties—SilPruf silicone’s combination of high tensile strength, high tear strength and the capacity to absorb high deformations (elongation) make this product an outstanding candidate for protective glazing designs and seismic applications

• Low VOC—Significantly lower than the U.S. Green Building Council’s Leadership in Energy and Environmental Design (L.E.E.D.) program’s requirements. Neutral cure byproduct with low odor.

• ±50% Movement Capacity—Can accommodate 50% movement in both extension and compression and has excellent recovery after cycling.

Application• Adhesion—Primerless adhesion to many substrates and

finishes. May be considered a candidate for use with numerous construction-related materials, including: glass, polycarbonate, vinyl, numerous plastics, treated and untreated wood, fluoropolymer and powder coated paints, conversion-coated and anodized aluminum, EIFS, brick, terra-cotta, ceramic and porcelain materials, concrete and natural stones. Some finishes or substrates may require a primer.

• Thermal Stability (cured state)—Once cured, the material remains elastic over a range of -55°F (-48°C) to 300°F (149°C) and up to 400°F (204°C) under intermittent short-term exposure.

• Stable Consistency (uncured state)—Supplied as a lightweight paste, the consistency of which remains relatively unchanged over a wide temperature range. The paste is able to be easily gunned and tooled under hot and cold conditions.

• Extended Work Life—Designed to allow the user sufficient time for placement and tooling.

• Low Sag or Slump—Useful for application to horizontal, vertical or overhead surfaces.

Product Compatibility• Full adhesive and chemical compatibility with GE sealants’

silicone elastomeric coatings (SilShield*) product family and silicone pre-cured weatherstrip (UltraSpan*) product family.

• Compatible with these GE sealants insulating glass products: IGS3703, IGS3713, IGS3723, IGS3743.

• Compatible with these GE sealants weatherproofing products: SCS2700, SCS9000, SCS2800, US1100, SEC2400, SEC2500.

• Compatible with these GE sealants structural products SSG4000, SSG4000AC, SSG4800J, SSG4400, SSG4000E, SSG4600.

*SilPruf, Silshield and UltraSpan are trademarks of Momentive Performance Materials Inc. Page 1 of 8

Property Value(1) Test Method

Hardness, Durometer 24 ASTM D2240 (Type A Indentor)

Ultimate Tensile Strength 341 psi (2.35 MPa) ASTM D412

Ultimate Elongation 715% ASTM D412,

Tensile at 50% Elongation 47.0 psi (0.32 MPa) ASTM C1184

Tensile at 100% Elongation 73.2 psi (0.50 MPa)) ASTM C1184

Ultimate Tensile Strength 140.5 psi (0.97 MPa) ASTM C1135

Ultimate Elongation 353% ASTM C1135

Tear Strength; die B 76.8 ppi ASTM D624

Shear Strength (@ 1/4” thickness) 121.4 psi (0.84 MPa) ASTM C961

Peel Strength (average) (21-day cure @ 75°F (21°C) 56.6 pli ASTM C794 50% RH)

Joint Movement Capability ±50% ASTM C719

Service Temperature Range -55°F to +250°F (after cure) (-48°C to 121°C )

Weathering and U.V. Resistance Excellent GE 20 yr. study

Cure Time (1/4”or 6 mm deep section) @ 75°F (24°C) 3-4 days 50% RH

Full Cure (most common bead sizes) 10-14 days

*SilPruf is a trademark of Momentive Performance Materials Inc. Page 2 of 8

SCS2000 SilPruf* Silicone Sealant & Adhesive

Technical Data Sheet

Potential ApplicationsSCS2000 sealant is recommended for the following applications:

Weatherproo¤ng• Between dissimilar or similar materials in either new or remedial

glazing and sealing applications

• Around window perimeters and punched openings

Structural Glazing• With sufficient project review

Protective Glazing• Successfully tested in protective glazing designs, may be

considered a candidate for such applications

Adhesive• Applied in panel stffener applications

• Useful for adhering US1100 and UST2200 UltraSpan pre-cured silicone weatherstrip product line

PackagingSCS2000 sealant is available in the following con¤gurations:

• 10.1 fl oz (299 ml) plastic caulking cartridges

• 20 fl oz (591.5 ml) foil sausage packs

• 2 gallon (7.6 L) plastic pails

• 5 gallon (18.9 L) plastic pails

ColorsSCS2000 sealant is available in 13 standard colors, and can be custom colored.

Grade . . . . . . . . . . . . . . . . . . . . . . ColorSCS2002 . . . . . . . . . . . . . . . . . . . . WhiteSCS2003 . . . . . . . . . . . . . . . . . . . . BlackSCS2004 . . . . . . . . . . . . . . . . . . . . LimestoneSCS2007 . . . . . . . . . . . . . . . . . . . . Medium GreySCS2008 . . . . . . . . . . . . . . . . . . . . Light GreySCS2009 . . . . . . . . . . . . . . . . . . . . Aluminum GreySCS2010 . . . . . . . . . . . . . . . . . . . . Dark GreySCS2020 . . . . . . . . . . . . . . . . . . . . Precast WhiteSCS2097 . . . . . . . . . . . . . . . . . . . . BronzeSCS2040 . . . . . . . . . . . . . . . . . . . . Earth ToneSCS2041 . . . . . . . . . . . . . . . . . . . . Red BrickSCS2046 . . . . . . . . . . . . . . . . . . . . ChampagneSCS2100.0148 . . . . . . . . . . . . . . Sandy Beige

Typical Physical PropertiesTypical property values of SCS2000 as supplied and cured are set forth in the tables below. Typical product data values should not be used as speci¤cations. Assistance with speci¤cations is available by contacting MPM at +1 (877) 943-7325.

Property Value(1) Test Method

Consistency Paste

Polymer 100% silicone

VOC 20 g/l WPSTM C1454

Work Life (tooling time) 30-40 minutes

Tack Free Time 3-4 hours ASTM C679 (@ 72°F, 50% RH)

Sag/Slump 0.1” max. ASTM D2202

(1) Typical properties are average data and are not to be used as or to develop specifications.

Typical Properties – Supplied

Typical Properties – Cured

InstallationSealants may not adhere or maintain long-term adhesion to substrates if the surface is not prepared and cleaned properly before sealant application. Using proper materials and following prescribed surface preparation and cleaning procedures is vital for sealant adhesion. IN ALL CASES IT IS IMPORTANT TO CONFIRM THE ACCEPTIBILITY OF EACH SEALANT-SUBSTRATE COMBINATION WITH A LAB OR SITE ADHESION TEST PRIOR TO PROCEEDING WITH PROJECT INSTALLATION. MPM can provide lab and ¤eld adhesion testing information and suggestions to user upon request.




Installation—continued

Surface PreparationPorous Materials (concrete, masonry, brick, stone, etc.)

• Joints must be clean, dry and sound prior to application of the sealant. All contaminants, impurities, or other adhesion inhibitors (such as moisture/frost, oils, concrete form release agents, old sealants, asphalt and other surface treatments, etc.) must be removed from the surfaces to which the sealant is intended to adhere.

• Clean where necessary by wire brush, mechanical abrading, grinding, sanding, saw cutting, blast cleaning (sand or water), or a combination of these methods to provide a stable clean surface for sealant application.

• Remove dust and other remaining loose particles with a soft bristle brush or by using an oil-free air blow.

• Polished stone surfaces and smooth sawn edges can be cleaned using a solvent dampened rag (allow sufficient time for solvent to evaporate prior to application of the sealant). When handling solvents, refer to manufacturer’s MSDS for information on handling, safety and personal protective equipment.

• Cleaning of surfaces should be done within 1 to 2 hours of when the sealant is to be applied.

• Since porous materials can absorb and retain moisture, it is important to confirm that substrates are dry prior to application of the sealant.

Non-Porous Materials (glass, metals, plastics, ceramics, etc.)

• Clean by using a two-rag wipe technique → wet one rag with solvent and wipe the surface with it, then use the second rag to wipe the wet solvent from the surface BEFORE it evaporates (allowing the solvent to dry on the surface without immediately wiping with a second cloth can negate the cleaning procedure because the contaminants may simply be re-deposited as the solvent dries). In all cases where used, solvents should be wiped dry with a clean, white cloth or other lint-free wiping materials. Change the cleaning rags frequently, as they become dirty. It is easier to see the dirt accumulating on the rag if white rags are used. Do not dip used cleaning rags into the cleaning solvent as this can contaminate the solvent (cleaning with contaminated solvent can result in sealant adhesion issues). Always use clean solvent-resistant containers for solvent use and storage.

• When cleaning deep, narrow structural glazing cavities, wrap the cleaning cloth around a clean, narrow-blade putty knife. This permits force to be applied to the cleaned surface.

• Isopropyl Alcohol (IPA) is a commonly-used solvent and has proven useful for most non-porous substrates encountered in architectural construction applications. Xylene and Toluene have also been found useful on many substrates. When handling solvents, refer to manufacturer’s MSDS for information on handling, safety and personal protective equipment.

• Architectural coatings, paints and plastics should be cleaned with a solvent approved by the manufacturer of the product or which does not harm or alter the finish.


• Difficult or nearly impossible to see on a joint substrate, frost is likely to develop on substrates when temperatures drop near the freezing point. Since frost and moisture will interfere with proper sealant adhesion, it is important to confirm that substrates are dry prior to application of the sealant.

Exterior Insulation and Finish Systems (EIFS)

• The use of an appropriate silicone primer is required on all EIFS substrates. Consult MPM Technical Services for sealant- primer-substrate recommendations.

• Confirm with the EIFS supplier which finish the sealant should be applied to (i.e., base coat or base coat with EIFS primer).

• All EIFS surfaces must be clean, dry and sound and in an acceptable condition to receive sealant. Confirm with the EIFS supplier or project architect or consultant, what joint conditions are considered acceptable for sealant installation to proceed. If unacceptable conditions are found, cease installation of sealant until corrections are made.

• To clean EIFS, lightly abrade the joint surfaces using a synthetic brush or pad and then remove dust and other remaining loose particles with a soft bristle brush or using an oil-free air blow.


• Since EIFS materials can absorb and retain moisture, it is important to confirm that the EIFS materials are dry prior to application of the sealant.

PrimingSCS2000 sealant attains primerless adhesion to many commonly encountered construction materials. However, some materials with variable surface characteristics may require the use of a primer to help obtain durable long-term adhesion. Prior to use, trial applications should be made to check adhesion to the specific materials to be used on the project. See the GE sealants primer datasheets for product specific information on use and priming instructions. PRIMER APPLICATION IS NOT A SUBSTITUTE FOR SURFACE PREPARATION. Consult MPM Technical Services for sealant-primer-substrate recommendations.

CAUTION: Primers may contain solvents. When handling solvents, refer to manufacturer’s MSDS for information on handling, safety and personal protective equipment.





MaskingThe use of masking tape is recommended where appropriate to ensure a neat job and to protect adjoining surfaces from over- application of sealant. Masking tape can prevent contact of sealant with adjoining surfaces that otherwise would be permanently marred or damaged by such contact or by cleaning methods required to remove sealant systems. When tooling, use care not to spread the sealant over the face of the substrates adjacent to the joint or masking as the silicone can be extremely difficult to remove on rough or porous substrates. Do not allow masking tape to touch clean surfaces to which the silicone sealant is to adhere (adhesive on masking tape can interfere with adhesion of silicone). Masking tape should be removed immediately after tooling the sealant and before the sealant begins to skin over (tooling time).

Sealant Application – WEATHERSEALING • Apply sealant in a continuous operation, horizontally in one

direction and vertically from the bottom to the top of the joint opening, applying a positive pressure adequate to properly fill and seal the joint width.

• Tool or strike the sealant with a concave tool applying light pressure to spread the material against the back-up material and the joint surfaces to ensure a void-free application.

• In glazing applications, tool the sealant at the sill so that precipitation and cleaning solutions will not pool.

• Excess sealant should be cleaned from glass, metal and plastic surfaces while still uncured. On porous surfaces the excess sealant should be allowed to progress through the initial cure or set-up. It should then be removed by abrasion or other mechanical means.

• Due to the smooth consistency of SCS2000 sealant, tooling agents such as water, soap, or detergent solutions are not necessary or recommended. Dry tooling is recommended.

• Sealant is best applied when the temperature is above 40°F (4°C) as frost or moisture are less likely to be present on the surfaces to be sealed. However, SCS2000 sealant can be applied in colder temperatures; refer to the MPM technical bulletin “Cold Weather Sealing Guidelines” for additional information.

• Application of SCS2000 sealant is not recommended to be applied to substrates when surface temperatures are surfaces above 50°C (122°F).

• The cure rate of this product is dependent upon temperature and the availability of atmospheric moisture. Under Standard Conditions (relative humidity of 50 ± 5% at an air temperature of 73.4 ±2°F [23 of ±1°C]) this material can attain a cured thickness of 2-3 mm per 24 hours (assuming ample access to atmospheric moisture). As temperature decreases, the cure rate slows down

(and vice versa). Low moisture environments will also reduce the cure rate. Near-confined spaces which limit the overall access to atmospheric moisture will cure only from that surface which has access to the atmosphere. Colder temperatures can significantly increase cure times and can open the possibility of sealant irregularities if joint movement occurs while sealant is not fully cured. The following reference provides additional information on Movement-During-Cure of sealant joints: ASTM C1193 - Standard Guide for Use of Joint Sealants; section 12.5.

Sealant Application – STRUCTURAL GLAZING • Apply the sealant by pushing the bead ahead of the nozzle and

making sure that the entire cavity is filled. Tooling should be done neatly, forcing the sealant into contact with the sides of the joint, thus helping to eliminate any internal voids and assuring good substrate contact.

• SCS2000 sealant should not be applied in totally confined spaces since the sealant requires exposure to air a to cure properly and develop typical properties. In a typical SSG cavity, cure depths up to 3/4” (19 mm) from an air interface will generally cure satisfactorily and reach maximum properties within several days. Cure depths > 3/4” (19 mm) may take significantly longer time to cure and when applied in a single application may not cure satisfactorily. Consult MPM technical services for additional information on depth of cure for this product.

Method of ApplicationSCS2000 sealant is easily dispensed directly from cartridges and foil sausage packs using standard caulking guns or from 2 gallons pails using standard bulk caulking gun equipment. The sealant may also be dispensed from 55 gallon drums with pumping equipment.

Joint Designs and Dimensions— Weathersealing ApplicationsJoint Movement—The dimensions of joints in typical construction applications change daily as a result of solar heat gain and building sway, and throughout the year due to seasonal changes. The movement in a sealant bead installed on the sun-side of a building or during the hottest portion of the day will be almost entirely in extension during the cold season or cycle; while the movement of a bead installed during the coldest condition will be almost entirely in compression during the hotter season or cycle. In addition to these above movements, the designer should consider the effect of construction tolerances in his/her project to minimize the occurrence of over-sized or under-sized joints during construction. All moving (dynamic) joints must be designed so as not to allow three-sided adhesion of the sealant to occur (reference ASTM C1193). Three-sided adhesion hinders the ability of the sealant to extend and compress freely as desired and can lead to early joint failure.





Joint Designs and Dimensions— Weathersealing Applications—continuedJoint Width—When using SCS2000 sealant, the designed joint width must be at least twice the total anticipated joint movement. For example, if the total anticipated movement in an expansion joint in which SCS2000 sealant is to be installed is 1/4” (6 mm), the designed joint width must be at least 1/2” (12 mm). The designer may want to consider additional width to accommodate construction tolerances (reference ASTM C1472). Large panels or lites should allow a minimum width of 1/4” (6 mm) for the sealant bead, mostly to allow for a proper installation (very small/ narrow beads become di®cult to install and can accommodate less movement). Glazing of plastic or larger-sized metal panels may require larger than usual joint widths due to the greater movement potential (higher coe®cients of thermal expansion). Consult with MPM Technical Services for recommendations on large or unusual applications.

Butt Joints—A thin installation of silicone sealant can better accommodate more movement than a deep installation, as the deeper bead will result in additional stress being imposed on both the sealant and the bonding surfaces during joint movement.

Figure 1 illustrates the general guidelines for installation of SCS2000 sealant into a typical butt joint con¤guration of widths up to 2” (5 cm).

1.) The recommended sealant pro¤le is an hourglass shape with the depth of the sealant over the crown of the backer rod to be no thinner than 1/8” (3 mm) and no thicker than 3/8” (10 mm), and

2.) A minimum of 1/4” (6 mm) of adhesive bonding contact must be made to all surfaces to which the sealant is intended to adhere.

When used in joints exceeding 2” (5 cm) in width:

3.) The recommended sealant pro¤le is an hourglass shape with the depth of the sealant over the crown of the backer rod to be no thinner than 1/4” (6 mm) and no thicker than 3/8” (10 mm), and

4.) A minimum of 3/8” (10 mm) of adhesive bonding contact must be made to all surfaces to which the sealant is intended to adhere.

Figure 1JOINT WIDTH

DEPTH OVER CROWN OF BACKER 3 mm (1/8”) MINTO 10 mm (3/8”) MAX

6 mm (1/4”)MINIMUM ADHESION CONTACT

Joint Backer Materials

Backer materials, typically backer rod, provide the following bene¤ts to aide in the correct application of SCS2000 sealant.

1.) To control and provide the desired sealant depth.

2.) Create a formed joint cavity that allows for the desired hourglass sealant shape.

3.) Provide a ¤rm backup which helps attain full wetting of the substrates when the sealant is tooled.

4.) Act as a bond breaker to eliminate adhesion on the backside of a joint (three-sided adhesion).

Non-gassing polyethylene, polyole¤n or polyurethane foam rod is the recommended back-up material for use with SCS2000 sealant. If the joint is too shallow to allow foam rod, use a polyethylene tape (as a bond breaker to eliminate three-sided adhesion). On EIFS and porous substrate applications, a closed cell backer rod is recommended (open cell backer materials absorb and hold water which can affect long-term sealant adhesion on these materials). Backer rod should be 25-50% greater (con¤rm with manufacturer of backer rod as to type selected) than the width of the joint, thereby providing continuous pressure against the joint walls, and expanding and contracting with the joint movement without pushing the sealant out of the joint during the compression cycle or falling away during the extension cycle. Rubber backup materials may stain the sealant and are not recommended, unless tested and veri¤ed for compatibility.

Joint Designs and Dimensions— Structural Glazing Applications

• Silicone contact width and thickness (see Figure 2) will vary by project with the design wind load and glass size.

• Contact Width can be calculated using the following formula: [Design Wind Load (PSF) x Longest Short Span of Glass or Panel (Ft.)] divided by 480.





Joint Designs and Dimensions— Structural Glazing Applications—continued• A minimum sealant thickness of 1/4” (6 mm) between substrates

is required to accommodate thermal expansion and contraction (see Figure 3) of most systems and should be used in order to assure that sealant can be injected into the structural cavity obtaining full contact with both the glass and metal surfaces while remaining free of air voids. Greater joint thickness may be required to accommodate movement in some larger-sized SSG systems. MPM can be contacted to assist in determination of proper joint thickness to accommodate expected movement in structurally glazed applications.

Soliciting Manufacturers Suggestions

Required materials for submission:

• Architectural and shop drawings for review and comment.

• Design wind load requirement(s) for project.

• Glass or panel sizes.

• Production samples of metal, glass, gaskets, spacers and setting blocks with type and manufacturer identi¤ed.

• Specification and/or identification of paint or finish to which SCS2000 sealant is intended to adhere (i.e., 215-R1 anodized or if paint; manufacturer, ¤nish system and ID#).

Recommendations & information provided after review:

• Determination as to whether the submitted joint dimensions meet the minimum design criteria necessary for the use of SCS2000 sealant.

• Short-term adhesion data using (typically) ASTM C794, C1635, ISO 8340, ISO 8339, ISO 10591 and/or ASTM C1135 test method. Other test methods may be requested for a nominal charge.

• Short-term compatibility test results on gaskets, spacers and setting blocks and other accessories per ASTM C1087 or MPM plant standard test method for compatibility.

• Information regarding suggested primers, when required.

Momentive Performance Materials will not:• Design sealant joints.

• Provide comments on the structural integrity of overall framing system(s).

The design professional has ¤nal responsibility for the determination of structural sealant joint dimensions based on project conditions, design wind load(s), glass or panel sizes, anticipated thermal, seismic or other movement of the system.

The ASTM C1401 Standard Guide for Structural Sealant Glazing provides a thorough overview of design topics and information for use in SSG systems.

Figure 2

STRUCTURAL SILICONE

CONTACT WIDTH

DEPTH

THICKNESS

HORIZONTAL SECTION

Figure 3: Movement from thermal expansion and contraction and/or glass rotation

Applicable StandardsSCS2000 sealant meets or exceeds the requirements of the following speci¤cations:

American Society for Testing & Materials International• ASTM C920 Standard Specification for Elastomeric Joint

Sealants; Type S, Grade NS, Class 50, Use A, G, M, O, NT

• ASTM C1184 Standard Specification for Structural Silicone Sealants;

Type S, Use G & O

U.S. Federal Speci�cations: (widely referenced but cancelled Sept. 1996)• TT-S-001543A Sealing Compound: Silicone Rubber Base (for

Caulking, Sealing & Glazing in Buildings and Other Structures)

• TT-S-00230C Sealing Compound: Elastomeric Type, Single Component (for Caulking, Sealing & Glazing in Buildings and Other Structures)

Canadian General Standards Board (currently inactive)CGSB-19.13-M87 Sealing Compound, One-Component, Elastomeric, Chemical Curing

SCS2000 sealant carries SWR Institute validation @ ±50% movement.




Technical ServicesAdditional technical information and literature is available from MPM Laboratory facilities and application engineering are available upon request from MPM. Any technical advice furnished by MPM or any representative of MPM concerning any use or application of any sealant is believed to be reliable but MPM makes no warranty, expressed or implied, of suitability for use in any application for which such advice is furnished.

LimitationsCustomers must evaluate Momentive Performance Materials (MPM) products and make their own determination as to fitness of use in their particular applications.

SCS2000 sealant is not recommended:

• For use underwater or in other applications where the product will be in continuous contact with water.

• For use in food contact applications.

• When painting of the cured sealant is desired (unless appropriate specialized paint products are used).

• For structural adhesion on bare metals or surfaces subject to corrosion (i.e., mill aluminum, bare steel, etc.).

• When using colors other than black for structural glazing applications, contact Momentive Technical Services prior to use.

SCS2000 sealant should not be applied or used:

• In structural glazing applications unless Momentive Performance Materials (MPM) has reviewed shop drawings for applicability and has performed adhesion and compatibility tests on project substrates, spacer materials and all accompanying accessories. Review and testing is done on a project-by-project basis. No blanket approval is given by MPM for structural glazing applications. Structural glazing industry guidelines (ASTM C1401) suggest that drawings and details are to be reviewed by all parties involved in the manufacture of an SSG system and for each building project.

• Under exceedingly hot or cold conditions (see Sealant Application section for additional information).

• On wet, damp, frozen or contaminated surfaces.

• On excessively basic or acidic substrates.

• In exceedingly large structural cavities (see Sealant Application section for additional information).

Precautions

• This material requires atmospheric moisture to cure from paste to rubber and may not attain its listed final cured rubber properties when used in designs or applications where the silicone is encapsulated and lacks access to atmospheric moisture.

• When sealing against natural stones, MPM recommends that stain testing be performed prior to use to ascertain the visual acceptability of the sealant-stone combination. MPM recommends evaluation of SCS9000 sealant when sealing to natural stones.

• Some materials that bleed plasticizers or oils can cause a discoloration on the surface of sealants. When sealing to or over items such as rubberized gaskets, bituminous-based materials, butyl or oil-based products, oily woods, tapes, etc., MPM recommends that compatibility testing be performed prior to use to confirm the suitability of the use of these materials when in contact with each other.

• Silicone materials are hydrophobic in nature and if inadvertently over-applied onto adjacent joint surfaces (even if removed immediately), can create a waterproofing effect on some sub-strate types when the substrate is wet. See section on Masking.

Suggested ReferencesIn addition to the guidelines provided on this datasheet, MPM recommends that designers and users of SCS2000 sealant familiarize themselves with the latest editions of following industry guidelines and best practices:

1.) ASTM C1193 Standard Guide for Use of Joint Sealants.

2.) ASTM C1481 Standard Guide for Use of Joint Sealants with Exterior Insulation & Finish Systems (EIFS).

3.) ASTM C1472 Standard Guide for Calculating Movement and Other Effects When Establishing Sealant Joint Width.

4.) ASTM C1401 Standard Guide for Structural Sealant Glazing

5.) SWR Institute’s Applying Liquid Sealants Applicator Training Program.

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Visit us at www.ge.com/silicones

CDS: Data SCS2000SilPruf (3/18) 161-005-20E-GL

Page 8 of 8

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Patent StatusNothing contained herein shall be construed to imply the non-existence of any relevant patents or to constitute the permission, inducement or recommendation to practice any invention covered by any patent, without authority from the owner of the patent.

Product Safety, Handling and StorageCustomers considering the use of this product should review the latest Material Safety Data Sheet and label for product safety information, handling instructions, personal protective equipment if necessary, and any special storage conditions required. Material Safety Data Sheets are available at www.ge.com/silicones or, upon request, from any MPM representative. Use of other materials in conjunction with MPM sealants products (for example,primers) may require additional precautions. Please review and follow the safety information provided by the manufacturer of such other materials.

SPECIFICATIONDATA SHEET

BASIC USES

Pecora 895 NST has been specifically designed for:• Structural glazing of glass, metal and plastic. It may also be used as a weatherseal in structural glazing applications.• Non-structural glazing applications including cap, toe and heel beads and as a weatherseal in glass to glass butt joint glazing.• Sealing expansion and control joints in precast concrete panels, metal curtain walls, and natural stone.• Perimeter sealing of doors, windows and other building components.• Adhering stiffeners to building panels.• Use in unitized curtain wall systems. • Security glazing and impact-resistant window systems.

MANUFACTURER

PECORA CORPORATION

165 Wambold Road

Harleysville, PA 19438

Phone: 215-723-6051

Fax: 215-721-0286

Website: www.pecora.com

Since Pecora Architectural Sealants are applied to varied substrates under diverse environmental conditions and construction situations it is recommended that substrate testing be conducted prior to application.


PRODUCT DESCRIPTION Pecora 895NST is a high-performing,

neutral curing, medium modulus

silicone sealant specifically designed

for structural and non-structural

glazing, with excellent aesthetic

characteristics in that it will not

stain sensitive porous natural stones

such as granite or marble and will

not contribute to residue run down

on non-porous surfaces such as

metal or glass curtain wall facades.

Reduction in long term dirt pick up

on sealant surface is also a feature

of the Pecora NST line of silicone

architectural grade sealants. With

a dynamic movement capability of

±50% to complement its structural

strength, 895NST is equally efficient

as a weath erseal in the vast majority

of sealant ap plications other than

glazing.

Features:• Excellent unprimed adhesion to most surfaces including glass, reflective glass, anodized aluminum, plastics, wood, masonry, and fluoropolymer based paints.• Long open time for ease of application and tooling.• Extremely fast cure-through after initial set.• Compatible with most laminated glass units and acrylic and polycarbonate glazing sheets.• Easily applied (gunnable) at all working temperatures. • Will not corrode building components.• Mild odor.• Suitable for use on natural stones such as limestone, granite or marble.No blanket approval is given by Pecora Corporation for structural glazing applications. Pecora offers a structural glazing appraisal program that is designed to reduce the risk for all project participants and is required for all structural glazing projects.

Limitations: Pecora 895NST should not

be used in these applications or conditions: • To seal exterior insulation finish systems (EIFS).• To seal horizontal joints in decks, walks, driveways, etc. subject to abrasion.• To seal marine joints at or below the waterline.• In totally confined or air-free spaces.• In designs that require painting after application of sealant.• On surfaces with special protective coatings without prior consultation with Technical Services department.• In contact with building materials that bleed oils, plasticizers or solvents, i.e. impregnated wood, oil-based caulks, green or vulcanized rubber gaskets or tapes.• When surface temperatures during application exceed 140°F (60°C).• To damp or frost covered surfaces.• 895NST Translucent (Pecora color #610) is not intended for use in 4-sided structural glazing applications.

TABLE 1: TYPICAL UNCURED PROPERTIES (AT 77°F, (25°C), 50% RH)

TEST PROPERTY VALUE TEST PROCEDURE

Flow, Sag, Slump Nil ASTM C639

Tool/Work Time (minutes) 15-25 Pecora Corporation

Tack Free Time (hours) 3 ASTM C679

Curing Time (days) 7-14 ASTM C679

Full Adhesion (days) 7-14 ASTM C679

VOC Content (g/L) 98 ASTM D3960

VOC Emissions (TVOC) <2 ug (0.002 mg)/cu m CDPH v1.1-2010 (CA Specfication 01350)

TABLE 2: TYPICAL CURED PROPERTIES (AFTER 7 DAYS CURE AT 77°F, (25°C), 50% RH)

TEST PROPERTY VALUE TEST PROCEDURE

Hardness, Shore A 30 ASTM D2240

Elongation (%) 700 ASTM D412

Modulus @ 100% Elongation (psi) 50 ASTM D412

Ultimate Tensile Strength (psi) 200 ASTM D412

Tear Strength (ppi) 40 ASTM D624

Peel Strength (pli) 30 ASTM C794

on Aluminum, Glass and Concrete

Dynamic Movement Capability (%) +/-50 ASTM C719

Ozone/UV Resistance Excellent ASTM D1149

Staining, Color Change None ASTM C510

Staining of porous substrates like marble Pass ASTM C1248

Service Temperature (°F) -60 to 300 Pecora Corporation

PEC 111 9/17

Structural Silicone Glazing & Weatherproofing Sealant

895Pecora

895-datasheet-4.21.17.indd 2 9/15/17 5:15 PM

TECHNICAL DATA Applicable Standards: Pecora 895NST

meets or exceeds the following:

TT-S-00230C, Class A, ASTM C-920,

Class 50, Type S, Grade NS, Use

G,A,M,O; Type I & II, ASTM C-1184-05,

AAMA 805.2, AAMA 802.3 & 808.3,

ASTM C-1248 and is USDA approved in

meat and poultry plants. Missile Impact

Miami-Dade PA 201 and SSID 12-99,

CAN/CGSB-19.13-M87.

INSTALLATIONStructural Sealant Joint Design:The

design professional is responsible for

the determination of the structural

sealant joint dimension based on

design windloads, glass sizes and

anticipated thermal movement.

Pecora Corporation must verify and

approve joint dimensions on an

individual project basis.

PACKAGING• 10.1 fl . oz. (300 ml) disposable plastic cartridges• 20 oz. (592 ml) sausages• 2-gallon (7.57 liters)• 5-gallon (18.9 liter) pails• 50-gallon (189 liter) drums

COLOR• Black, Limestone, Precast, Charcoal Gray, Sandstone, Red Rock, Hartford Green, Tru-White, Aluminum Stone, Beige, Classic Bronze, Natural Stone, Anodized Aluminum, and Translucent

• Custom colors are available upon request. (30 gallon minimum)

• The structural sealant joint must be able to be filled using standard caulking practices.• The structural joint must not move during cure.

These are preliminary guidelines only, consistent with common industry practice. See Figure 1.

Basic Design Parameters Include:• Structural sealant thickness must not be less than 1/4” (6.4 mm).• Structural bite must not be less than structural sealant thickness.• Structural bite must be determined using the following formula:

B=(W.L.)(1/2)(S)12x20

S = Short span of glass, feetW.L. = Windload, PSFConstant = 12Design Stress, psi Max. = 20B = Bite

SPECIFICATIONDATA SHEET895Pecora


179886_Form1_Pecora_PEC_111 12/23/14 3:56 PM Page 3

Weatherseal Joint Designs:Proper sealant dimensions are critical when installing elastomeric joint sealants. Generally, a sealant width-to-depth ratio of 2:1 is recommended. Dynamic joint conditions will require a minimum 1/4” width and 3/16” depth in order to maintain the sealant’s movement capabilities. For joints greater than 1”, consult Technical Services. Open-cell polyurethane foam or closed-cell polyethylene are the recommended back up materials for most joints*; use polyethylene tape for joints too shallow to allow backer rod. See Figure 2.These materials permit application of athin bead and act as bond breakers, which allow the silicone sealant to stretch freelywith the joint. *Use a size that will compress 25% when inserted into the joint. When using closed cell polyethylene foam, extra care must be taken not to puncture the rod which can cause outgassing and bubbling/blistering in the sealant. The width of building expansion joints varies because of seasonal and daily changes in temperature. If Pecora 895NST silicone building sealant cannot be installed when the design width is approximately halfway between the dimensional extremes, the design joint must be at least twice the total anticipated joint movement. Good architectural practice calls for joint design of four times the anticipated movement due to construction tolerances and material variations.Glazing rabbets and joints should be designed to allow installation and retentionof the bond-breaking, back-up materialduring the installation and curing of Pecora 895NST silicone building sealant.Lap shear joints should have a bead width which is equal to or greater than the total

anticipated movement. See Figure 3.Small curtainwall panels and lites should allow a minimum width of 1/8” (3.2 mm)for the sealant bead. Larger panels and lites which expect a great deal of movement, should allow a minimum width of 3/16” to 1/4” for the sealant bead. Glazing of plastic lites and sealing of wall panels fabricated of plastics require larger than usual joint dimensions due to the greater movement potential caused by plastic’s higher coefficients of thermal expansion.

Surface Preparation: No sealant will maintain long-term adhesion to any substrate if the surface is not prepared and cleaned properly before the sealant is applied. Thoroughly clean all joints and glazing areas by removing all foreign matter and contaminants such as oil, dust, grease, frost, water, surface dirt, old sealants or glazing compounds and any protective coating. Porous substrates and precast concrete panels using form release agents other than polyethylene film should be cleaned by grinding, saw cutting, blast cleaning (water or sand), mechanical abrading or a combination of these methods which will provide a sound, clean and dry surface for sealant application. Dust, loose particles,etc. should be blown out of joints with oil-free compressed air or vacuum cleaned by a solvent procedure or by mechanical means. Soap or detergent and water cleaning treatments are not recommended. Cleaning of all surfaces should be done just prior to the sealant application.

NOTE: Structural glazing requires even greater attention to surface cleaning and preparation. Pecora Technical Bulletin No.56 on structural glazing addresses these procedures in much greater detail.

Priming: Pecora 895NST does notrequire priming on most commonsubstrates. Unusual building materials, special coatings and treatments of surfaces may impair optimum adhesion. Due to the unpredictable nature of these surfaces, a field test is recommended to determine the adhesion of 895NST silicone with or without a primer. Where primer isindicated, P-150 primer should be used on porous substrates and P-120 on metal. All precast substrates require priming withP-225 primer.


SPECIFICATIONDATA SHEET895Pecora

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ecora is a member of and supports I I I I I I I. ecora is I O erti ed.

Pecora products are proudly made in America.

165 Wambold Road, Harleysville, PA 19438 | 800.523.6688 | pecora.com


Our logo is the stamp of our brand. It helps express our brand personality and attributes and can be

combined with a tagline that takes this communication a step further. These logos and lock-ups can

be used in a variety of marketing communications and environments.

logo lockup

P E C O R A P R O T E C T S .

P E C O R A P R O T E C T S

Architectural Weatherproofing ProductsU.S.A. • since 1862

Architectural Weatherproofing ProductsU.S.A. • since 1862



P E C O R A P R O T E C T S

WITH LOGO (PRIMARY) WITH LOGO (SECONDARY)

WITHOUT LOGO WHITE VERSIONS

FOR PROFESSIONAL USE ONLY.KEEP OUT OF THE REACH

OF CHILDREN.

NOTE: Priming is never a substitute for proper surface cleaning and preparation. To assist in this determination, Pecora hasa list of adhesion-peel-test results on a wide variety of substrates and building materials which is available on request from Technical Services.Pecora routinely conducts project specific adhesion and compatibility testing in its laboratory on representative substrate samples. Consult Technical Services for details.Masking: Areas adjacent to joints shouldbe masked to assure neat sealant line. Do not allow tape to touch clean surfaces to which sealant is to adhere.

Application: Install back-up fillers, setting blocks, spacer shims and tapes as speci-fied.Apply 895NST silicone in one continu-ous operation. Tool sealant at once after application before skin forms. Tool concave* with a firm continuous stroke to assure complete sealant contact with the substrate and present a neat appearance. Remove masking tape.*In glazing applications be sure that the sealant is tooled at the sills so that precipitation and cleaning solutions willnot pool. For cold temperature applications of Pecora 895NST refer to Pecora Cold Temperature Application Technical Bulletin #65.

Clean Up: Immediately remove all excess sealant and smears adjacent to joints with mineral spirits. Also use mineral spirits for removing uncured sealant from equipment. Remove cured sealant by scraping, sandpapering, etc. (Caution: mineral spirits is flammable and toxic. Observe manufacturer’s precautions.)

Tool Time: 15-25 minutes at 77ºF, 50% relative humidity. Higher temperaturesand humidity will shorten this time.

Shelf Life: Pecora 895NST Silicone has a shelf life of twelve months from date of manufacture when stored in unopened cartridges or sausages at temperatures lower than 80º F (27º C), or nine monthsin tightly-sealed bulk packages.

Precautions: Use with adequate

ventilation or wear an appropriate NIOSH-

approved respirator. Contact with uncured

sealant or with vapors generated during

curing may cause respiratory tract irritation.

Contact with skin or eyes may cause

irritation or allergic reaction. Avoid contact

and wash thoroughly after handling. May be

harmful if swallowed. Refer to Safety Data

Sheet (SDS) for more information.

AVAILABILITY AND COSTPecora products are available from stocking

distributors nationwide. For the name

and telephone number of your nearest

representative, call the number below or

visit our website at

www.pecora.com.

WARRANTYPecora Corporation warrants its products

to be free of defects. Under this warranty,

we will provide, at no charge, replacement

materials for, or refund the purchase price

of, any product proven to be defective

when used in strict accordance with

our published recommendations and in

applications considered by us as suitable

for this product. The determination of

eligibility for this warranty, or the choice of

remedy available under this warranty, shall

be made in our sole discretion and any

decisions made by Pecora Corporation shall

be final. This warranty is in lieu of any and

all other warranties, expressed or implied,

including but not limited to a warranty of

merchantability or fitness for

a particular purpose and in no case will

Pecora be liable for damages other than

those expressly stated in this warranty,

including but not limited to incidental or

consequential damages.

MAINTENANCEIf the sealant is damaged and the bond is intact, cut out the damaged area and recaulk. No primer is necessary. If the bond has been affected, remove the sealant, clean and prepare the joint in accordance with instructions under “INSTALLATION”.

TECHNICAL SERVICESPecora representatives are available to assist you in selecting an appropriate product and to provide on-site application instructions or to conduct jobsite inspections. For further information andassistance, please call our Technical Services department at 215-723-6051 or 800-523-6688.

FILING SYSTEMS • CSI MasterFormat Designations: - 07 92 00: Joint Sealants - 08 85 00: Glazing Accessories


895Pecora


recommended sealants, gaskets, and tapes · forth in the tables below. typical product data values...

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