o-rings bay seal company

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TABlE OFCoNTENTS

Introduction

W h at i s a n ( i) -r in g? 1

H ow a re O -r in gs m ad e] ~

S t an d a rd O - ri n o 8"~Seal E la! il ( ,fmeJ'$ 2

C om pa ffi ." 0 1 p r oR Ur tie s o f c o mm on lv u se d elas~omel'S' 2

Ro w ate O-r ings siled? ~

HC)w do l - spec lf Y and order a III O-r ing? 3

Wha t i s D u r o ,m e te r? 4

W h at i s C o m pr es si on S et ? ¢

Wha t i s E x t ru s io n ? 4

W h at i s V a cu um T ec hn o lo g y? 5

Permeat ion 5

Outgassing 6

Trapped Ga s 5

W h at I s V a cu u m P re du re ? e

W h at i s a n N W II SO -t yp 8 centerl~g- r i ng assembl y? 6

W h at i s a s pl ic ed O -r ln g1 I)

W ha t Is 10S t re tc h a h d 00 iottlrfererlee? 7

Wha t i s R e d uc ti o n In Cro~on? 7

F a ce S ea l G la nd D es ig n 8

Static S e al G J an d D e si gA 9

I ndOS tt ia l R e el p ro c at ln g S e al D e si g n 10

F u ll D o ve ta il G ro o ve D e si gn 11H a lf D o ve t ai l G roQV 8 D e si gn n

. 0 .5 6 68 O - r ing size chart 12

J IS 8 24 04 O -r in g s iz e c ha rt 22

F ra ct io n . B sc im a l, a n d M il li me te r C o nv er sio n C ha rt 2- 4

0C h em i ca l C om pa t ib i li ty T a bl e 25

P r es s ur e G o nv e rs io n T a bl e 49

T em pe r: a ti Jr e C o n ve r si o n T a b le 49

C o mm o rt s .a l F a ilu re s 50

S ta n d ar d G lo s sa r y T e rm s 52

WARNING

illuse any herein

cause death, personal injury and/or property damage.

user this should aspects an

and review the information of the product or system within the current

product catalog. information within this has been

and but the conduct

their due and t>nJ,rflorOfl,Ul!

conditions that may vary. The user issolely responsible for making the

final selection of and all an

has compi led thi s Osring r efe rence guide to provide a quick

and needs. Also

a

of AS568 and JIS Ovring size references.

rely

of Bay Seal Company to assist you with all of your sealing inqumes. Remember, the

recommended that the end users conduct their own evaluations and tes ts when choosing a sea

What is an O-ring?

AnO-ring torus, doughnut-shaped from are

made ino the r p la st ic ma te rial s, and me ta ls , both hol low and sol id . They a re used primari ly

and prevents an unwanted escape o

a a g l and ) is aThe elastomeric material has a cross section is a irtnal ircle, The is

UAv''UU...·..metal} toto ~l1ichth e O-r ing isplaced. the combination of these

&

UPDI (Optional)

Post CuringCleaning

MOl

"'f·:

Flash

Isolation

is



Elastomer &

ozone

chemical resistance characteristics, Generally

automotive brake systems,

Applications

excellent resistance

products and solvents, with good high

temperature

lowgaspermeabil ity, i t is also suited lor

hard

Use With

These FluidsO-r ing seals have been standardized under the basic industr ial s tandard dimensions of A. 56

12 1), the Society AutOnlo-{lhese Fluids

Perfluoroelastomer

(FFKM)

-26"C to .;316°C

5"F to

- POOR

FAIR

high

low temperature o f s i lk one with

the fuel, oil, and solvent resistance of

f luorocarbon,

N i tr il e c om bi n es e x c el l en t resistance

petroleum based oils and fuels, silicone

greases, alcohols,

has

such

excellent heat resistance, and overwhelming

E-

Silicone elastomer is resistant to high,dry

Petroleum oils, diester

lubricants

a

M83248. MS9020,

connectors.

use

fittings; anrake fluids.

refrigerants. steam Ii

Petroleum oils,water ,

AN6227 isan Air Force-Navy Aeronautical Standard that covers 88 sizes ofAS568. MS28775

MS9020,

covers traight- thread tube f it tings. These O-r ings are equivalent to dash numbers 901 through 932 o

are MSI MS33649

for

Acetone. IUS.

aminestransmission

P e tr o le um o i ls .

gasolineAcetone, ethyl acetate

IS on

Other sizes. including metric, please contact Bay Seal Company.Petroleum oils,

oils H2S an do

"W"Cross

th

whenMost chemicals ordering your desired O-ring.

oils

View

Every O-ring order should bestandard size

number s ed cO lnpQund an d

du ro

The LD. (Inside Diameter) or.

the

1

sealing

Molded Pa rt s, Rubbe r to Metal Bonding , and so much more . Contact us fo r a il your s ea ling

is



Bav Seal Company O-Ring Reference Guide O-Ring Reference Guid

What is durometer?

A vacuum a air

Outgassing, a nd T ra pp ed G as a re three primary sour e

ciastomeric sea l ~

Permeation

o r es id ua l gas contaminants from

is volum etr ic flow ga s u nd er s tea dy -sta te cond ition s through

surface a rea o f un i t t hi ck ne ss a u n it p re ss ur e d if fe re nc e. is a fundamenta

The an

Durometer i s the inter na tional s tandar d the har dnes s measur ement r ub b e- r, 1 '1 0 0 . a n d

other nonmetallic materials, Th e S h or e A Durorneter m ea uring de 'ice c o ns is ts o f a n e ed l e o n

a pring t ha t m e as ur es h ow fu r re n e ed l e i n de n ts t he m a te ri a l. is

for if an is cured properly. Simply stated,

the .A \'8St majority 0 O~dl1gs have a Shore A

o an d 7 -_ Many people use the durometer measurement as a criterion for

pump-down time

Calculations:

.. rate.

High pressures decrease permeation rate

Compression Squeeze x 100

Cross Sectionallowed to return to it's original thickness . The conclusion

of test is

(25%) which is not recovered.

.. Higher temperatures increase diffusion

rate

fi llers eliminat e d iffusi venorganic"Return Set .. the

Thicknessastomer is healed . which affects vacuum

amounts of

volatil ize under vacuum conditions. To significantly

ThicknessO-ring.

Tr apped Gas refers to th release of gas t rapped by t h e e l a st omer in the gro ve (especially

overIS

or

or a combination of both.

Extrusion GapMaximum Recommended Extrusion Gap in Inches

Pressure

PSI)Elastomer Hardness (Durometer)

5is



Bav Seal Company O-Ring Reference Guide Bay Seal Company

What is vacuum pressure?

Vacuum IS usually specified in terms of

practice.

Normal atmospheric pressure represents zero

IS terms of

the heigh t o f a column of mercury

table

What is an N\V/ISO-type centering

Cenrering ring assemblies necessary, when

using NWIf 0 anges , to maintain a re li ab le

app lica tion condi tions warr an t o ther metal s,

The seal component can any elastomeric

compound, ut are U u a l l _ either a

l1u reelastomer FKM ) or perfluoroelastcmer

(FFKM .

What isa spliced O-ring?

What is interference?

O-Ring Reference Guide

stretch and

Atmosphere x 1 0 1 2 .9 5 = millibar

should be slightly smaller

so

O-ring is slightly stretched.

than the gland diameter, sothat there isalways

the

What is cross section?

x - This identif lcation call-out should be the compound

abbreviar lon. ' i tr ile = "HR . F luo roe ta st om er FKM.Bay

asslstauee with spedfic manufacturers compounds)

M ax 5%.

Mi n ~ /o

M ax 20;,

0%

Max 5 o / c ~

Min

3 (~/o

%

M AX

Ref w-w

So, if the 10 of an O-Ring is "stretched" , the cross

A spliced O-r ing is made from an e x tr ude d c o rd and then vulcanized to form the O-r ing size

cross section should be used for all compression and glad till calculations for piston type and

I

A8568 Original Cross Reduced Cross Section a tI Series Section (inl mm) %o f ID S tr et ch ( in / mm)

I 1% I 2% 3% I 4% ~!'!_-Oxx 0.070 in .069 I .069 .068 .068 .068

~ O.103 in .102 .101 .100 i .100 .100

~~~ 0,139 in .138 I .137 136 I .135 ,!]4

-3xx n.210 in .208 .206 .205 .204 203

_::~ 0.275 In .272 .270 .268 .267 .266

-Oxx 1.78mm 1.76,

1.75 1.74 1.73 L72

:l~ 2.62 mm 2.59 2.57 2,56 2.55.~

-Zxx 3.53 mm 3.49 ! 3.47 3.44 I 3.43 I 3.41

i ~ I 5.33 mm 5.28 I 5.24 5.20 I 5.18 I 5.15

i ..~4)()( 6.99 mm ~ I ~ 6.82 6.79 6 : 1 2

to

pressure and temperature are applied (pressure, temperature, and time var ies with compound

and the.)

customers. Please contact B ay Seal Company for information regarding spliced Ovrings.

7 ou rou r



Industrial Reciprocating Seal Design Chart

Piston Gland

(B-! 'H"~A ~lAX

r Pi""" nnA Cylinder Bore nia.

I)Rod Bon" I lia.

A-I Rod Gland Groove m

W

O-Ring

Cross Section Eeccen-

tricitv (b

-006 .010 15 ,002

Squeeze I Diametral Groovef-------_A_--,--------il

Actual I % I Clearance ! Radius

Gland

De tho. I Nominal I Actual

1 1 1 6 .070±

.1

t o 1/ 8 ,139 ± t o t o t o t o t o .003

-222 1 ') 1 ,022 16 .006, .025- _)

.185 .017 8 .003 .020

16 .210

.275

(extrusion gap) must

range variation

Total indicator reading between groove and adjacent bearing surface,

Company

273-7325 Fax

10

Bay Seal Companv O-Ring Reference Guid

Dovetail GrooveS e c t i o n a l

Charts

For dovetail grooves, match

cen te rl ine of the groove with the

of the O-ring.

edge of

Width (G)

-102

To

-178

-201

To

-284

()land

Depth

(L) -309

To

-395

0,005

,171

0.210

-425

To

-475

,t

III ! Half Dovetail Groove DetailGland (;hmd I IAS568A O-Rillg Cross

I Sqlll"fZC (;land CornerSeries Width

Radii

I-004 Io

-1l50 I102 .095 .083 !

0.!03 0.00] To 19 To/ 0.010 11M I Gland Wid th (G)

ITo To 0.010 1 / 3 2

-284 .128

- J O Y .171 !I

To To 17 0.01'; 1 / 3 2

I395 m-425 .255 234 I RaTo 0275 0.006 To 15 To 0,015 1/16 I475 .257 238

(R

I

Company

273-7325 Fax

II

o-rings bay seal company

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