o-rings bay seal company
TRANSCRIPT
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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
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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
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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
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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
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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
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