refregerent 1515

8/12/2019 refregerent 1515

1/21

DuPont Engineering Polymers

StartwithDuPont

Processing Guide

Typical Processing Conditionsfor DuPont Engineering Polymers


2/21

1

Typical Processing Conditionsfor DuPont Engineering Polymers

Injection Molding of EngineeringPolymersThe injection molding of thermoplastic resins is awell known and widely practiced science. But itmust be performed properly if the optimum proper-ties of the material are to be achieved. DuPontPolymers makes a number of engineering plasticsrepresenting a range of chemical types. Each hasits own specific processing characteristics whichmust be considered and understood before success-ful molding operations can be accomplished. Theinformation presented is intended to provide guid-ance in the molding and extruding of DuPont

Engineering Polymers. Additional information canbe found in the Molding Guide for each product.

Processing ConditionsThe optimum processing conditions for a plasticare determined by the nature of the plastic. It isimportant that the recommended processing condi-tions be followed, subject to the experience of themolder. Molding conditions can affect the perfor-mance of the polymer, especially toughness, moldshrinkage, weld lines, post mold shrinkage andsurface appearance of the molded part.

Sales InformationDuPont Engineering Polymers are manufactured inten countries and sold throughout the world. Localsales and technical support personnel are availableto serve you almost anywhere. For further informa-tion, please contact any of the regional offices onthe back cover.

Tables 15Tables 15describe typical processing conditionsfor injection molding of ZytelNylon Resin,MinlonEngineering Thermoplastic Resin, GlassReinforced Zytel, DelrinAcetal Resin, Hytrel

Engineering Thermoplastic Elastomer, RynitePETThermoplastic Polyester Resin, Rynite PBTThermoplastic Polyester Resin and Zenite.

Table 6Table 6describes typical extrusion conditions forZytel, Delrin, and Hytrel.


3/21

2

Resin Grade

Resin Code Description

Table 1Zytel Nylon Resin

66 Nylon 101 General PurposeUnmodified101L General PurposeLubricated101F General PurposeFast Cycle103HSL Heat StabilizedLubricated103FHS Fast CycleHeat Stabilized105 BK010A Weather Resistant122L Hydrolysis Resistant132F Fast CycleLightly Nucleated133L NucleatedColor StabilizedLubricated

Toughened 408 Impact Resistant66 Nylon 408HS Impact ResistantHeat Stabilized

408L Impact ResistantLubricated450HSL BK Intermediate Impact Resistance, Heat Stabilized

and Lubricated3189 Impact Resistant3189HSL Heat S tabilizedLubricated

Super Tough ST800L Outstanding Impact ResistanceLubricatedNylon ST800HSL Heat Stabilized ST800L

ST801 Outstanding Impact ResistanceLubricatedST801HS Heat Stabilized ST801ST801W Weatherable, UV Resistant ST801

ST901L Amorphous Characteristics

ST901HSL Amorphous CharacteristicsHeat Stabilized

ST811HS Super Tough Nylon 6Heat Stabilized

612 Nylon 151L General PurposeLubricated153HSL Heat StabilizedLubricated157HSL BK010 Weather and Heat ResistantLubricated158L High Viscosity and Tougher Than 151LLubricated

Modified 109L Color StabilizedNucleatedLubricatedCopolymer

Transparent Nylon 330 General PurposeAmorphous Characteristics

Melt (Stock)Temperature*

280305C(535580F)

290295C(550560F)

290295C(550560F)

275300C

(530570F)

225290C(440550F)

230290C(450550F)

255290C(490550F)

300320C(570610F)

Typical Injection Molding Conditions for Zytel,Minlon, GRZ, Flame Retarded Nylons, Delrin,

Hytrel, Rynite, and Zenite

*The processing conditions presented here are representative of those typically used or preferred. Rounded numbers are shown for both English and SIunits. See your sales representative to obtain maximum part quality on any specific job.

DehumidifyingDryer Conditions

Time/Temp.

Virgin resin is packaged dry inmoisture-proof boxes and bags.Pre-drying should not benecessary unless package isdamaged.

It is important to keep resin dryduring molding. If residence timein the hopper is over one hour, adehumidified hopper dryer is

recommended (80C[175F]).

Regrind resin must be dried at80C(175F). Time will dependon storage time, particle sizeand humidity.

The following are generalguidelines:

Time in Drying Time**Open Container (at 80C [175F])

04 hr 2 hr

424 hr 4 hr

15 days 24 hr

>5 days 48 hr

Nylon will discolor on drying. The

amount of color change dependson temperature and time.

Consult Molding Manual on Zytelfor more detailed information.

**Dew point 18C(


4/21

3

Increasing backpressure increases thework done by the screwon the melt.

This has the followingadvantages anddisadvantages:

Advantages

Increases melt

temperature anduniformity.

Can be used tominimize unmeltedparticles.

Improves color mixingwhen colorconcentrates areused.

Disadvantages

Decreases output ofscrew.

Increases drool(nozzle).

Reduces glass fiberlength in glass-

reinforced resins,thus changingphysical properties(strength/impactresistance).

Increases equipmentwear with filledresins.

Scrubs barrel (blackspecks).

Screw retraction timeshould be approximately80% of the cool time foroptimum molding.

34138 MPa(5,00020,000 psi)

41138 MPa(6,00020,000 psi)

41138 MPa(6,00020,000 psi)

69138 MPa

(10,00020,000 psi)

55138 MPa(8,00020,000 psi)

34138 MPa(5,00020,000 psi)

41138 MPa(6,00020,000 psi)

62138 MPa(9,00020,000 psi)

101101L101F103HSL103FHS105 BK010A122L132F133L

408408HS408L450HSL BK

31893189HSL

ST800LST800HSLST801ST801HSST801W

ST901L

ST901HSL

ST811HS

151L153HSL157HSL BK010158L

109L

330

260300C 270C 275C 280C Moderate(500570F) (520F) (525F) (540F) to Fast

260300C 275C 280C 295C Moderate(500570F) (525F) (535F) (560F)


265305C 280C 285C 300C Moderate

(510580F) (535F) (545F) (570F) to Fast








Fill Screw Back InjectionSpeed Speed Pressure Pressure

Slow toModerate

Slow toModerate

Slow toModerate

Moderate

Slow toModerate

Slow toModerate

Slow toModerate

Slow toModerate

*The processing conditions presented here are representative of those typically used or preferred. Rounded numbers are shown for both English and SI

units. See your sales representative to obtain maximum part quality on any specific job.

Reciprocating Screw Machine*

Typical Cylinder Temperatures

Nozzle Front Center Rear

ResinGrade

Code


5/21

4

101101L101F103HSL103FHS105 BK010A122L132F133L

408408HS408L450HSL BK

31893189HSL

ST800LST800HSLST801ST801HSST801W

ST901L

ST901HSL

ST811HS

151L153HSL157HSL BK010158L

109L

330

4095C(100200F)

4095C(100200F)

4095C(100200F)

4080C(100175F)

4095C(100200F)

4095C(100200F)

4095C(100200F)

6595C(150200F)

Mold SurfaceTemperature* Comments



Molding wet nylon resin will show up as one or more of these:

drool and frothy melt

splay on part surface

brittle parts

Drool can be minimized by

decreasing nozzle temperature

decreasing melt temperature

decreasing cycle ensuring that resin is dry

using suck back, or

using a reverse taper nozzle.

If screw does not retract or retracts erratically, check rear zone temperature or heater band. Aluminumdistearate may be added (20 g per 22.7 kg[50 lb] maximum) to aid in screw retraction. Too much lubricantmay show up as surface splay and/or brittle parts. Also, moisture levels greater than 0.5% may causeerratic screw recovery. Check moisture and dry to less than 0.2%.

Nylon parts will absorb moisture after molding, which can cause changes in physical properties (moistureincreases impact resistance and elongation) and dimensions.

If higher toughness (impact resistance) is required, toughened compositions should be considered.

Nylon parts that have been degraded (as evidenced by brittleness or brown color) should not be regroundand remolded.

Dehumidified drying ovens and vacuum drying are also suitable.

Consult the Molding Manual on Zytel for additional details.


ResinGrade

Code



6/21

5

GRZ Glass-Reinforced Zytel

General Purpose 70G13L 13% GlassLubricated70G13HS1L 13% GlassHeat Stabilized, Lubricated

70G33L 33% GlassLubricated70G33HRL 33% GlassHydrolysis Resistant,

Lubricated70G33HS1L 33% GlassHeat Stabilized, Lubricated70G43L 43% GlassLubricated

Improved Surface 72G13L 13% GlassLubricated,66/6 Copolymer

72G13HS1L 13% GlassHeat Stabilized, Lubricated72G33L 33% GlassLubricated,

66/6 Copolymer72G33HS1L 33% GlassHeat Stabilized, Lubricated72G43L 43% GlassHeat Stabilized, Lubricated

Impact Modified 71G13L 13% GlassLubricated71G13HS1L 13% GlassHeat Stabilized, Lubricated71G33L 33% GlassLubricated

Toughened 8018 14% Glass8018HS 14% GlassHeat Stabilized80G33L 33% GlassLubricated80G33HS1L 33% GlassHeat Stabilized, Lubricated80G43HS1L 43% GlassHeat Stabilized, Lubricated

Toughened, 82G33L 33% GlassLubricated, 66/6 CopolymerImproved Surface

GR 612 Nylon 77G33L 33% GlassLubricated77G33HS1L 33% GlassHeat Stabilized, Lubricated77G43L 43% GlassLubricated

290310C(550590F)

270285C(520545F)

290310C(550590F)

290310C(550590F)

280305C(540580F)

280305C(540580F)

Flame Retarded Nylon

Zytel FR10 General PurposeUnreinforced

FR50 25% Glass-Reinforced

Minlon FR60 Mineral-Reinforced

Minlon Engineering Thermoplastic Resin

Engineering 10B40 Mineral-ReinforcedThermoplastic 10B40HS1 Mineral-ReinforcedHeat StabilizedResin 20B Mineral/Glass-Reinforced

22C Mineral/Glass-Reinforced

11C40 Intermediate ToughenedMineral Reinforced

12T ToughenedMineral Reinforced

295305C(560580F)

280300C(540570F)



Resin Grade


Table 2Flame Retarded Nylon, Minlon Engineering Thermoplastic Resin and Glass-Reinforced Zytel

Melt (Stock)Temperature*


Time/Temp.

250275C(480525F)

Virgin resin is packaged dry inmoisture-proof boxes and bags.Pre-drying should not benecessary unless package isdamaged.

It is important to keep resin dryduring molding. If residence time

in the hopper is over one hour, adehumidified hopper dryer isrecommended (80C[175F]).

Regrind resin must be dried at80C(175F). Time will depend onstorage time, particle size andhumidity.

The following are generalguidelines:

Time in Drying Time**Open Container (at 80C [175F])

04 hr 2 hr

424 hr 4 hr

15 days 24 hr

>5 days 48 hr

Nylon will discolor on drying. Theamount of color change depends ontemperature and time.

Consult Molding Manual on Zytel formore detailed information.

**Dew point 18C(


7/21

6


FR10

FR50

FR60


10B4010B40HS120B22C

11C40

12T



Code Nozzle Front Center Rear

34138 MPa(5,00020,000 psi)

34138 MPa(5,00020,000 psi)

34138 MPa

(5,00020,000 psi)

55138 MPa(8,00020,000 psi)

55138 MPa(8,00020,000 psi)

34138 MPa

(5,00020,000 psi)

34138 MPa(5,00020,000 psi)

34138 MPa(5,00020,000 psi)

34138 MPa(5,00020,000 psi)

34138 MPa(5,00020,000 psi)

34138 MPa(5,00020,000 psi)


70G13L

70G13HS1L70G33L70G33HRL70G33HS1L70G43L

72G13L72G13HS1L72G33L72G33HS1L72G43L

71G13L71G13HS1L71G33L

8018

8018HS80G33L80G33HS1L80G43HS1L

82G33L

77G33L77G33HS1L77G43L




Fill Screw Back InjectionSpeed Speed Pressure Pressure

295305C 280290C 290295C 295300C Fast Slow

(560580F) (540550F) (550560F) (560570F)

220250C 230240C 240245C 245250C Fast Slow(430480F) (450460F) (460470F) (470480F)


295305C 280290C 290295C 295300C Moderate Slow(560580F) (540550F) (550560F) (560570F) to Fast


280295C 270275C 275280C 290300C Fast Slow

(540560F) (520530F) (530540F) (550570F)







Increasing backpressure increasesthe work done by thescrew on the melt.

This has thefollowing advantagesand disadvantages:

Advantages

Increases melttemperature anduniformity.

Can be used tominimize unmeltedparticles.

Improves colormixing when colorconcentrates areused.

Disadvantages

Decreases outputof screw.

Increases drool(nozzle).

Reduces glassfiber length inglass-reinforcedresins, thuschanging physicalproperties(strength/impactresistance).

Increasesequipment wearwith filled resins.

Scrubs barrel(black specks).

Screw retraction timeshould be approxi-mately 80% of the cooltime for optimummolding.

ResinGrade


8/21

7

4065C(100150F)

65120C(150250F)

65100C(150210F)

65100C(150210F)

65100C(150210F)

65120C

(150250F)

65120C(150250F)

65120C(150250F)

65120C(150250F)

65120C(150250F)

65120C(150250F)


70G13L

70G13HS1L70G33L70G33HRL70G33HS1L70G43L

72G13L72G13HS1L72G33L72G33HS1L72G43L

71G13L71G13HS1L71G33L

80188018HS80G33L80G33HS1L80G43HS1L

82G33L

77G33L77G33HS1L77G43L

ResinGrade

Code


FR10

FR50

FR60


10B4010B40HS120B22C

11C40

12T






Breathing of fumes should be avoided. Consult Zytel Molding Guide for recommended moldingarea ventilation.

At higher temperatures and excessively long holdup time, decomposition of the flame-retardedresins may occur, evolving some hydrogen halides (which are corrosive). See MSDS forinformation on these resins.

Shutdown must always be preceded by completely purging the molding machine.

Glass-reinforced nylons and Minlon are abrasive to equipment. Bimetallic barrel liners andscrew flight lands of a hard surfacing alloy are recommended. The following processingconditions will aid in minimizing wear:

use suggested high rear zone cylinder setting

use minimum screw speed and back pressure

keep check valve in good operating condition

The surface appearance of the molded part depends partly on the mold surface temperature.The temperatures shown here will give the best surfaces. It may be necessary to increase thenozzle temperature to prevent freeze-off.

A fast, one-second injection speed normally gives the highest gloss.

Consult the molding manual on glass-reinforced Zytel and Minlon for additional details.


9/21



8

High Viscosity 100 High Viscosity100P Superior Processing100F Fast Cycle100AF TFE Fiber FilledLow Friction107 UV Stabilized (Delrin 100 Base)

General Purpose 500 General Purpose 500P Superior Processing

500F Fast Cycle500AF TFE Fiber FilledLow Friction500CL Chemically Lubricated507 UV Stablized (Delrin 500 Base)570 20% GlassHigh Stiffness, Low Warpage577 Black Weatherable (Delrin 570 Base)

Low Viscosity 900 Low ViscosityHigh Flow900P Superior Processing900F Fast Cycle900HP High Productivity1700HP Special Purpose High Flow

Toughened 100ST Super Tough (Delrin 100 Base)500T Toughened (Delrin 500 Base)

Most Flexible Grades G3548W Flexible Grade with Color Stable Antioxidantand Lowest Melting 4056 Flexible Grade

HTR8122 Most Flexible GradeG4074 Flexible Grade with High Heat StabilizerG4078W Flexible Grade with Color Stable Antioxidant

Low to Mid-Range 4069 Flexible Grade, High PerformanceFlexural Modulus 4556 Mid-Range Flexiblity With High Performance

5526 Mid-Range Flexiblity With High Performance5556 Mid-Range Flexiblity With High Performance5555HS Mid-Range Grade with High Heat Stabilizer

Mid-Range Flexibi li ty G4774 Mid-Range Grade with High Heat StabilizerG5544 Mid-Range Grade with High Heat Stabil izer6356 Mid-Range with High Performance

High Strength and 7246 High Modulus, High Strength, High PerformanceStiffness 8238 High Modulus, High Strength, High Performance

Special Grades HTR6108 Mid-Range with Low Permeability to Fuels andOils

HTR8068 Flame Retardant Grade, UL-94V-0

Hytrel Engineering Thermoplastic Elastomer

Resin Grade


Table 3Delrin Acetal Resin and Hytrel Engineering Thermoplastic Resin

Melt (Stock)Temperature**


Time/Temp.

Delrin Acetal Resin*

Not Usually Required

Drying Conditions for Hytrel

Drying DryingTemperature Time

Dehumidified 110C 23 hrhopper (230F)

Dehumidified 80C overnighthopper (175F)

Air circulating 110C 46 hroven (230F) (in dry weather)

**Grades in bold type are also available in Delrin II.

**The processing conditions presented here are representative of those typically used or preferred. Rounded numbers are shown for both English and SI units. See your salesrepresentative to obtain maximum part quality on any specific job.

Hytrel can be used directly fromundamaged sealed bags and maynot need to be dried prior to mold-ing. As manufactured, thesepolymers are dried to a moisturecontent below 0.1% and packagedin special moisture-resistant bags.However, since there is a possibil-ity of damaged or open bags, and inany case when using regrind, adesiccant hopper dryer should beused to ensure moldings of highquality. This will also protectagainst moisture pickup duringprocessing. Dehumidified hopperdryers reduce and control the resin

moisture content and improvequality.

195215C(380420F)

205225C(400440F)

205225C(400440F)

205225C(400440F)

180205C(355400F)

190220C(375430F)

220250C(430480F)

230260C(445500F)

240260C(465500F)

205C(400F)

24 hr at 80C(175F)


10/21

9

100100P100F100AF107

500500P500F500AF500CL507570577

900900P900F900HP1700HP

100ST500T

G3548W4056

HTR8122G4074G4078W

40694556552655565555HS

G4774

G55446356

72468238

HTR6108HTR8068



Code Nozzle Front Center RearFill Screw Back

Speed Speed Pressure



Table 3Delrin Acetal Resin and Hytrel Engineering Thermoplastic Resin

Delrin Acetal Resin*



205C 200C 200C 200C Moderate Slow to(400F) (390F) (390F) (390F) to Fast Moderate

195C 190C 190C 190C Moderate Slow to(380F) (370F) (370F) (370F) to Fast Moderate

205C 200C 200C 200C Moderate Slow to

(400F) (390

F) (390

F) (390

F) to Fast Moderate

175C 190C 190C 165190C Moderate Moderate(345F) (375F) (375F) (330375F)



240C 245C 245C 220245C Moderate Moderate(465F) (475F) (475F) (430475F) to Fast

230C 245C 245C 220245C Moderate Moderate

(455F) (475F) (475F) (430475F)


Increasing back pressure increases the workdone by the screw on the melt.

This has the following advantages anddisadvantages:

Advantages

Increases melt temperature anduniformity.

Can be used to minimize unmeltedparticles.

Improves color mixing when colorconcentrates are used.

May be required for better mixing with any

of the five Hytrel concentrates withspecial additives.

Disadvantages

Decreases output of screw.

Increases drool (nozzle).

Scrubs barrel (black specks).

Increasing back pressure increases thework done by the screw on the melt.

This has the following advantages anddisadvantages:

Advantages

Increases melt temperature and

uniformity. Can be used to minimize unmelted

particles.

Improves color mixing when colorconcentrates are used.

Disadvantages



Reduces glass fiber length in glass-reinforced resins, thus changing physicalproperties (strength/impact resistance).

Increases equipment wear with filledresins.


**Grades in bold type are also available in Delrin II.

**The processing conditions presented here are representative of those typically used or preferred. Rounded numbers are shown for both English and SI units. See your salesrepresentative to obtain maximum part quality on any specific job.

ResinGrade


11/21


12/21

11

*The processing conditions presented here are representative of those typically used or preferred. Rounded numbers are shown for both English and SI units. See your salesrepresentative to obtain maximum part quality on any specific job.

Rynite PET Thermoplastic Polyester Resin

General Purpose 530 30% Glass-Reinforced545 45% Glass-Reinforced555 55% Glass-Reinforced,

Highest Stiffness

408 30% Glass-Reinforced,

Improved Toughness

Low Warp 935 35% Mica/Glass-Reinforced940 40% Mica/Glass-Reinforced

Flame Retarded FR515 Flame Retarded15% Glass-ReinforcedFR530 Flame Retarded30% Glass-ReinforcedFR543 Flame Retarded43% Glass-ReinforcedFR943 Flame Retarded43% Glass/Glass FlakeFR945 Flame Retarded45% Glass/MineralFR946 Flame Retarded46% Glass/Glass Flake

Super Toughened SST35 Stiffened, Super Tough,35% Glass-Reinforced

Toughened 415HP Toughened, 15% Glass-Reinforced

DehumidifyingDryer Conditions Melt (Stock)

Resin Code Description Time/Temp. Temperature*

270290C(520550F)

250260C(480500F)

250260C(480500F)

270290C

(520550F)

270290C(520550F)

280300C(540570F)

280300C(540570F)

Table 4Rynite PET and Rynite PBT Thermoplastic Polyester Resin

250260C(480500F)

250260C(480500F)

250260C(480500F)

Rynite PBT Thermoplastic Polyester Resin

Unreinforced 6125 Heat Stabilized

Toughened 6400 Super Tough

Flame Retardant FR6944 Flame RetardedUL94 V-O

Glass Reinforced 7015 15% Glass Reinforced7030 30% Glass Reinforced

Glass Reinforced, FR7915 15% Glass Reinforced, F lameFlame Retardant Retardant

FR7930 30% Glass Reinforced, FlameRetardant

FR7930F 30% Glass Reinforced, High Flow,Flame Retardant

Resin Grade



Hopper Dryer Required

Air Temperature:120135C(250275F)

105C(225F) overnight

Dew Point:18C(0F) or lower

Air Flow Rate:0.81.0 CFM per lb/hr ofresin processed

Drying Time:Virgin resin 23 hrRecycled regrind 34 hrWet resin (See Drying Manual)

270290C

(520550F)


13/21

ResinGrade

Code



530545555

408

935940

FR515FR530FR543FR943FR945FR946

SST35

415HP


6125

6400

FR6944

70157030

FR7915

FR7930

FR7930F



260295C 260280C 260280C 260275C Moderate

(500560F) (500540

F) (500540

F) (500530

F) to Fast




240260C 240260

C 240260

C 230250

C Moderate(460500F) (460500F) (460500F) (450480F) to Fast




Nozzle Front Center Rear Fill Speed







12


14/21


530545555

408

935940


SST35

415HP


6125

6400

FR6944

70157030

FR7915

FR7930

FR7930F


Increasing back pressure increases the work done bythe screw on the melt.

This has the following advantages and disadvantages:

Advantages

Increases melt temperature and uniformity.

Can be used to minimize unmelted particles. Improves color mixing when color concentrates are

used.

Disadvantages



Reduces glass fiber length in glass-reinforced resins,thus changing physical properties (strength/impactresistance).

Increases equipment wear with filled resins.


Screw retraction time should be approximately 80% ofthe cool time for opt imum molding.

Slow

Slow

Slow

Slow

Slow

Slow

Slow

Slow

Slow

Slow

Slow


ScrewSpeed Back Pressure Injection Pressure



ResinGrade

Code


34124 MPa(5,00018,000 psi)

34124 MPa(5,00018,000 psi)

34124 MPa(5,00018,000 psi)

34124 MPa(5,00018,000 psi)

55124 MPa(8,00018,000 psi)

55124 MPa(8,00018,000 psi)

5595 MPa(8,00014,000 psi)

69124 MPa(10,00018,000 psi)

5595 MPa(8,00014,000 psi)

5595 MPa(8,00014,000 psi)

5595 MPa(8,00014,000 psi)

13


15/21


530545555

408

935940


SST35

415HP



6125

6400

FR6944

70157030

FR7915

FR7930

FR7930F


ResinGrade

Code

Part MinimumThickness Temperature

0.75 mm 110C(0.03 in) (230F)

1.5 mm 105C(0.06 in) (220F)

3.1 mm 100C(0.12 in) (210F)

6.3 mm 90C(0.25 in) (190F)

Part MinimumThickness Temperature

0.75 mm 95C

(0.03 in) (205F)1.5 mm 90C

(0.06 in) (195F)

3.1 mm 85C(0.12 in) (185F)

6.3 mm 75C(0.25 in) (165F)

3065C(90150F)

3065C(90150F)

3065C

(90150F)

3065C(90150F)

3065C(90150F)

Proper drying of polyesters is critical, to prevent resin degradation. Moisture content must beless than 0.02% for PET, less than 0.04% for PBT. If degradation should occur because ofexcessive moisture, there will be no evidence on the surfaces of partsthey will just bebrittle.

High surface gloss can be obtained if the mold surface temperature is 93C(200F) or hotter.This hot mold will also give optimum long-term dimensional stability.

To reduce wear, bimetallic barrel liners and screw flight lands of a hard surfacing alloy arerecommended.

Consult molding guide on Rynitefor additional details.

Screw compression ratios are a compromise between melt temperature uniformity and glassfiber length. A range of 3.03.5 has been found to be best.




14


16/21

Resin Grade

Resin Code DescriptionMelt

Temperature*




Time/Temp.

General Purpose HX1000 Neat ResinAmorphous HX1130 30% Glass

HX1330 30% Talc

High Temperature HX4000 Neat ResinCrystalline HX4100 30% Glass

HX4200 50% GlassHX4330 30% Talc

High Toughness HX6000 Neat ResinCrystalline HX6130 30% Glass

HX6150 50% GlassHX6330 30% Talc

Tough/High HX7000 Neat ResinTemperature HX7130 30% GlassCrystalline HX7150 50% Glass

HX7330 30% Talc

Hopper Dryer Required

Air Temperature:120150C(250300F)

Dew Point:18C(0F) or lower

Air Flow Rate:0.81.0 CFM per lb/hr ofresin processed

Drying Time:Virgin resin 23 hrRecycled regrind 34 hr

330340C(625645F)

340355C(640670F)

345360C(650680F)

355380C(670720F)

Table 5DuPont Liquid Crystal Polymer



15


17/21



Nozzle Front Center Rear

Fill Screw BackSpeed Speed Pressure






Resin Grade

Code

340C 335C 330C 325C Very Fast Slow(640F) (635F) (630F) (620F) (


18/21


Pressure Holding (Packing) Mold SurfaceInjection Pressure Temperature* Comments

40125 MPa 30100 MPa 80120C(6,00018,000 psi) (4,50014,500 psi) (180250F)

30125 MPa 30100 MPa 80120C(4,50018,000 psi) (4,50014,500 psi) (180250F)

30125 MPa 30100 MPa 80120C(4,50018,000 psi) (4,50014,500 psi) (180250F)

30125 MPa 30100 MPa 80120C(4,50018,000 psi) (4,50014,500 psi) (180250F)

HX1000HX1130HX1330

HX4000HX4100HX4200HX4330

HX6000HX6130HX6150HX6330

HX7000HX7130HX7150HX7330





Resin Grade

Code

Drying is critical, to prevent resindegradation. Moisture content must beless than 0.010%. If degradation shouldoccur because of excessive moisture,there will be no evidence on thesurfaces of parts.

Being a shear-sensitive resin, high fillrates are required to obtain a low meltviscosity for easy filling of long thin wall

sections. This also contributes to theanisotropic propertiesincluding highphysical properties, low thermalexpansion and low mold shrinkage inthe flow direction.

Gate locations should be chosen toavoid weld lines in critical areas.Multiple gates are generally notrecommended.

Zenite has excellent thermal stability. Inorder to minimize any possible effect ofglass breakage, it is recommended thatregrind be limited initially to 25%.

It is not necessary to purge with anotherresin if Zenite is to be molded uponreheating. When switching to or from

another resin, purge with low melt indexhigh-density polyethylene. This shouldbe a continuous purging wheneverbarrel temperatures exceed 315C(600F).

General purpose screws are recom-mended to reduce glass fiber breakage.To reduce wear, bimetallic barrel linersand screw flight lands of a hardsurfacing alloy are recommended.

17


19/21

18

Typical Extrusion Conditionsfor Zytel, Delrin, and Hytrel

Zytel Nylon Resin

66 Nylon 42 High Viscosity45HSB Heat Stabilized 42Lubricated

612 Nylon 153HSL Heat StabilizedLubricated158L General Purpose159L High Viscosity

350PHS Super ToughPlasticizedHeat Stabilized351PHS Highly Plastic izedHeat Stabil ized

6 Nylon ST811HS FlexibleHeat Stabilized

Modified 91AHS Heat StabilizedLubricatedCopolymers

Delrin Acetal Resin

High Viscosity II150SA High Viscosity100ST Toughened

General Purpose II550SA General Purpose


Most Flexible G3548W Flexible Grade with Color Stable AntioxidantGrades and 4056 Flexible GradeLowest Melting

HTR8122 Most Flexible GradeG4074 Flexible Grade with High Heat StabilizerG4078W Flexible Grade with Color Stable Antioxidant

Low to Mid-Range 4069 Flexible Grade, High PerformanceFlexural Modulus 4556 Mid-Range Flexibility with High Performance

5556 Mid-Range Flexibility with High Performance5555HS Mid-Range Grade with High Heat Stabilizer

Mid-Range G4774 Mid-Range Grade with High Heat StabilizerFlexibility G5544 Mid-Range Grade with High Heat Stabilizer

6356 Mid-Range with High Performance

High Strength and 7246 High Modulus, High Strength and PerformanceStiffness 8238 High Modulus, High Strength and Performance

Special Grades HTR6108 Mid-Range with Low Permeabil ity to Fuels and Oils

HTR8139LV Mid-Range Flexibility with Excellent Flex FatigueResistance

High Viscosity HTR5612 Mid-Range Grade with High Heat StabilizerGrades HTR5612 BK Mid-Range Grade with High Heat Stabilizer

HTR4275 Mid-Range Grade with High Heat StabilizerHTR4275 BK Mid-Range Grade with High Heat Stabilizer

HTR8177 High Modulus, High Strength

Resin Grade


Table 6Zytel, Delrin, Hytrel


Time/Temp.

Zytel must be dry prior to processing.

Virgin resin is packaged dry in moisture-proof boxes andbags. Predrying may not be necessary in noncriticalapplications.

Drying in dehumidified hopper driers is recommended(80C[175F] for 2 hr). Regrind or material from openedbags will require longer times.

Consult the Zytel Molding Manual for more detailedinformation.

Delrin does not usually require drying before processing.However, Delrin 100ST must be dried (24 hr at 80C[175F]).

Hytrel must be dry prior to extrusion.

Virgin resin is packaged in moisture-proof bags. Toensure dryness, resin should be dried in dehumidifying

driers a minimum of 2 hr at 105C(220F). Consult Rheology and Handling bulletin on Hytrel for

more information.



20/21

Typical Extrusion Conditionsfor Zytel, Delrin, and Hytrel

Typical Extruder Temperatures*

Center CenterRear Rear Front Front Head Die Melt Comments

Zytel Nylon Resin

290C 280C 280C 275C 275C 275C 290C(550F) (540F) (540F) (530F) (530F) (530F) (550F)

240C 240C 230C 230C 230C 230C 230C(460F) (460F) (450F) (450F) (450F) (450F) (450F)

230C 225C 220C 220C 220C 220C 220C(450F) (440F) (430F) (430F) (430F) (430F) (430F)

240C 240C 230C 230C 230C 230C 230C

(460F) (460

F) (450

F) (450

F) (450

F) (450

F) (450

F)

240C 240C 230C 230C 230C 230C 230C(460F) (460F) (450F) (450F) (450F) (450F) (450F)

205C 205C 200C 200C 200C 205C 210C(400F) (400F) (390F) (390F) (390F) (400F) (410F)

180C 180C 180C 180C 180C 180C 180C(355F) (355F) (355F) (355F) (355F) (355F) (355F)

195C 195C 195C 195C 195C 195C 195C(385F) (385F) (385F) (385F) (385F) (385F) (385F)

220C 220C 220C 220C 220C 220C 220C(430F) (430F) (430F) (430F) (430F) (430F) (430F)

225C 225C 225C 225C 225C 225C 225C(435F) (435F) (435F) (435F) (435F) (435F) (435F)

230C 230C 230C 230C 230C 230C 230C(445F) (445F) (445F) (445F) (445F) (445F) (445F)

240C 240C 240C 240C 240C 240C 240C(465F) (465F) (465F) (465F) (465F) (465F) (465F)

195C 195C 195C 195C 195C 195C 195C(385F) (385F) (385F) (385F) (385F) (385F) (385F)

220C 220C 220C 220C 220C 220C 220C(430F) (430F) (430F) (430F) (430F) (430F) (430F)

225C 225C 225C 225C 225C 225C 225C(435F) (435F) (435F) (435F) (435F) (435F) (435F)

240C 240C 240C 240C 240C 240C 240C(465F) (465F) (465F) (465F) (465F) (465F) (465F)

Table 6Zytel, Delrin, Hytrel

Zytel, Hytrel and Delrin tubing may be sizedusing common commercial methods employedwith other resins.

An extruder with an L/D ratio of at least 24/1is recommended.

It is recommended that the barrel beequipped with at least four heat controlzones.

Do not use undercut feed throats. Properly designed single-stage metering

screws are adequate. For high output a

barrier screw is preferred. A breaker plate of streamlined design is

suggested for supporting a screen pack oftwo 60 mesh and two 80 mesh screens.

The extruder head and adaptor must bestreamlined.

The die and mandrel design for a vacuumsizing process should have:

1. A ratio of die I.D./sizing plate I.D. of atleast 2/1 for small diameter tubing.

2. The annulus opening should be approxi-mately twice the tube wall thickness.

3. A minimum straight land length of 35 mmis recommended for both the mandreland die at the exit.

Use a drawdown ratio of 4/1 to 10/1 for free

extrusion. (The drawdown ratio is the crosssectional area of the die annulus divided by thecross sectional area of the tube.)

Delrin Acetal Resin


19


21/21

DuPont Engineering Polymers226941B Printed in U.S.A.

R d N H 41525 (R 95 1)

For more informationon Engineering Polymers:

For Automotive Inquiries:

MIDWEST

DuPont Engineering Polymers100 Corporate NorthSuite 200Bannockburn, IL 60015

(708) 735-2720

DuPont Engineering PolymersAutomotive Products950 Stephenson HighwayTroy, MI 48007-7013

(313) 583-8000

U.S.A.

EAST

DuPont Engineering PolymersChestnut Run Plaza 713P.O. Box 80713Wilmington, DE 19880-0713

(302) 999-4592

WEST

DuPont Engineering Polymers18500 Von Karman AvenueSuite 750, P.O. Box 19732Irvine, CA 92715(714) 263-6233

The data listed here fall within the normal range of properties but they should not be used to establish specification limits nor used alone as the basis ofdesign. The DuPont Company assumes no obligations or liability for any advice furnished or for any results obtained with respect to this information.All such advice is given and accepted at the buyers risk. The disclosure of information herein is not a license to operate under, or a recommendation toinfringe, any patent of DuPont or others. DuPont warrants that the use or sale of any material which is described herein and is offered for sale by DuPontdoes not infringe any patent covering the material itself, but does not warrant against infringement by reason of the use thereof in combination with othermaterials or in the operation of any process.

CAUTION:Do not use in medical applications involving permanent implantation in the human body. For other medical applications, see DuPontMedical Caution Statement, H-50102.

Asia PacificDuPont Asia Pacific Ltd.P.O. Box TST 98851Tsim Sha TsuiKowloon, Hong Kong852-3-734-5345

CanadaDuPont Canada, Inc.DuPont Engineering PolymersP.O. Box 2200Streetsville, MississaugaOntario, Canada L5M 2H3(905) 821-5953

Latin AmericaDuPont S.A. de C.V.Homero 206Col. Chapultepec Morales11570 Mexico D.F.(011 525) 250-8000

Japan

DuPont Kabushiki KaishaArco Tower8-1, Shimomeguro 1-chomeMeguro-ku, Tokyo 153Japan(011) 81-3-5434-6100

EuropeDuPont de Nemours Intl S.A.2, chemin du PavillonP.O. Box 50CH-1218 Le Grand-SaconnexGeneva, SwitzerlandTelephone: ##41 22 7175111Telefax: ##41 22 7175200

StartwithDuPont

(302) 999-4592

(800) 533-1313

refregerent 1515

Documents