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Sealing Elements

Technical Handbook O-rings

1 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info 1 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.infoIntroduction ............................................................. 2 1. O-ring Standards ............................................... 3 2. O-ring Sealing Principles .................................... 4 3. O-ring Applications ........................................... 7 4. Basic Elastomers ............................................... 9 5. Designing with Rubber ...................................... 22 6. Compound Selection ......................................... 32 ..................................... 35 ............................... 36 .......................................................... 37 compounds ......................................... 39 compounds ......................................... 47 compounds ...................... 60 ...................................... 69 .................................................... 85 .................................................. 86 ........................................... 86 .............................................. 87 ......................................................... 93 ...................................... 94 .................................. 94 .................................................... 95 ................................ 96 ..................................................... 97 .............................................................. 99 ................................................... 100 ......................................................... 101 ............................................................. 102 ........................................................ 102 ........................................................ 102 ........................................................... 103 ......................................... 104 ................................... 105 ............................................... 108 .................................................... 111 .................................................... 116 ................................................ 117 10. Control ............................................................. 126 11. Storage ............................................................ 127

Contents

.................................... 131 .................................... 138

12.B Gland Design Static Radial .................................... 140

............................. 142

12.D Gland Design Boss Seals ...................................... 144

......................... 145 .................... 147 ........ 151 ............................ 154 ..................................................... 155

O-rings

......................... 157 13. O-ring Assembling Conditions ....................................... 162 ........................................................... 169 ........................... 170 ................................ 179 .............................................................. 198 ........................... 203 and O-ring Cord ........................................... 212 17. O-ring Accessories ......................................................... 217 ..................................................................... 218 19.

Quad-Ring

/X-Ring ...................................................... 223 /X-Ring .................... 224

19.B Standard Quad-Ring

....................... 227 /X-Ring applications .......... 235 ............................................................. 236 239
.................................... 248 ............................ 253 .......................................... 254 .................... 255

Sealing Elements

2 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

IntroductionResponsibility

ERIKS O-ring advantages:

high tech semiconductor-applications. notice. distributor

Engineered solutions to problems

Logistics solutions

Sealing Elements

3 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

1. O-ring Standards

BS 1806 England

JIS B2401 Japan

ISO 3601 International

2. O-ring Sealing Principles

lated elastomeric O-rings. mating components. ID w

ID= O-ring inside diameter

w= O-ring cross section Media Media fig 1-3 media media

Sealing Elements

4 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

2. O-ring Sealing Principles

O-rings in reciprocating applications must be radial compressed

Sealing Elements

5 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

2. O-ring Sealing Principles

tolerances.

Pressure = 0

0-Ring Sealing Principle

between 15-30%.

Sealing Elements

6 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Identifying a sealing application type

Sealing tips

the seal. same O-ring or Quad-ring /X-ring

2. O-ring Sealing Principles

Sealing Application Types

DynamicStatic

Oscillating

Slow rotation with a

reversal of direction

FaceAxial

Slow Rotation

Surface speed less than

50 fpm (15 meters/min)

Reciprocating

Lineair motion with a

reversal of direction Rotary- high Speed RotationSurface speed greater than 50 fpm (15 meters/min)

Selecting the seal material

/X-ring will seal. Lubricating the seal and mating components with an appropi- the rotating member. section.

Sealing Elements

7 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

3. O-ring Applications

The O-ring is one of the most popular seal

choices because:

Static Applications:

1. Axial

2. Radial

3. Dovetail

4. Boss Seals

sealing. straight threads used with an O-ring f u l l t h r e a d s t o t h i s p o i n t t h r e a d d d i a.45° ± 5° d e t a i l 'a' .015 r a d f o r t h r e a d r u n o u tm i n . b o s s h e i g h t m i n . s p o t- f a c e d i a m e t e r .031 .016 r a d Q OY e P t h d.J c h a m f e r r e l i e f t o h e x f l at s s h o u l d b e within t h e 15°

± 5°

a n g l e a n d e d i a limitations s q u a r e n e s s b e t w e e n t h r e a d a n d f a c e o f h e x s h o u l d n o t e x c e e d h w h e n m e a s u r e d a t d i a m e t e r e t h i s d i m. a p p l i e s o n l y w h e n t a p d r i l l c a n n o t p a s s t h r u e n t i r e b o s s

Sealing Elements

8 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Dynamic Applications:

1. Reciprocating

2. Oscillating

Oscillating applications are those

3. Rotary

Miscellaneous Applications

3. O-ring Applications

fig 1-17 Belt crush seal application

Piston seal

rod seal

Sealing Elements

9 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

4.1. Select the elastomer

Resistance to the media

tance. it must not alter the operational characteristics or reduce Relationship of Cross-link Denisity and Physical Properties

4. Basic Elastomers

Low

Compound

tions.

The physics of Rubber

Sealing Elements

10 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Acrylonitrile butadiene, Nitrile or Buna N (NBR)

nitrile content.

4. Basic Elastomers

50% -15°c

18% -55°c

Low Lower compression set Low

Sealing Elements

11 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Hydrogenated nitrile, or highly saturated nitrile (HNBR)

Carboxylated nitrile (XNBR)

Nitrile/PVC resin blends (NBR/PVC)

Ethylene Propylene, and Ethylene Propylene Diene rubber (EPM, EPDM)

4. Basic Elastomers

Sealing Elements

12 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

4. Basic Elastomers

Neoprene rubber Polychloroprene (CR)

and ammonia. cr is resistant to low resistance to mineral oils.

Silicone rubber (VMQ)

Fluorosilicone (FVMQ)

Sealing Elements

13 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

4. Basic Elastomers

Polyurethane rubber (AU, EU)

tance.

Fluorocarbon rubber (FKM)

Sealing Elements

14 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Perfluorocarbons (FFKm)

teflon -FeP/PFA tFe/P (Aflas ) (FePm)

4. Basic Elastomers

Sealing Elements

15 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Polyacrylate rubber (ACM)

steering applications.

Epichlorohydrin (CO, ECO)

Vamac

Styrene Butadiene (SBR, Buna S)

Butyl (IIR)

Special materials

Homologations

4. Basic Elastomers

Sealing Elements

16 All the information in this documentation has been compiled with the gre atest of care. Despite this we can bear no responsibility whatsoever for any errors pre sent in the documentation. The recommendations are inte nded as guidelines. www.eriks.info

Technical Handbook O-rings

Table 3A-1

Elastomer

NBR EPDM CR VMQ FVMQ EU FKM FFKM FEP/PFA

ASTM Nitrile Neoprene Silicone Fluoro Urethane Fluoro Perfluoro encapsu- silicone carbon carbon lated compression set

B c c A B e c B e

e

Poor 5 Depending on elastomer core

but it should be tested.

4. Basic Elastomers

Sealing Elements

17 All the information in this documentation has been compiled with the grequotesdbs_dbs17.pdfusesText_23

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