Silicone gasket

DRAWING OF RUBBER GASKETS

 

 

 

 

Normally, rubber silicone gaskets  sizes are specified by the inner diameter (ID) and outer diameter (OD) and Height (H or T ) ,  and AS568, ISO3601 and JIS standard size and customized size are available.

 

 

 

RUBBER MATERIAL

 

 

Rubber Material could be Silicone , NBR , EPDM , FKM  etc.

 

 

RUBBER PROPERTY COMPARISON

 

 

                                              E - Excellent          G - Good          F - Fair          P - Poor 

Property

NBR

EPDM

CR

Silicone

FKM

NR

SBR

PU

HNBR

FVMQ

IIR

Aflas

Abrasion Resistance

G

G

G

P

G

E

E

E

G

P

G

G

Acid Resistance

F

G

F

F

E

F

F

P

E

F

G

E

Chemical Resistance

F

E

F

G

E

F

F

F

G

E

E

E

Cold Resistance

G

G

F

E

P

G

G

G

G

G

G

P

Compression Set Resistance

G

G

F

G

E

G

G

F

G

G

F

G

Dynamic Properties

G

G

F

P

G

E

E

E

G

P

F

G

Electrical Properties

F

G

F

E

F

G

G

F

F

E

G

E

Elongation

G

G

G

F

F

F

F

F

G

F

G

F

Flame Resistance

P

P

G

F

E

P

P

P

P

G

P

E

Heat Resistance

G

G

G

E

E

F

F

F

E

E

G

E

Impermeability

G

G

G

P

G

F

F

G

G

P

E

G

Oil Resistance

E

P

F

F

E

P

P

G

E

G

P

E

Ozone Resistance

P

E

G

E

E

P

P

E

G

E

G

E

Tear Resistance

F

G

F

P

F

G

G

G

F

P

G

P

Tensile Strength

G

G

G

P

G

E

E

E

E

F

G

G

Water Resistance

G

E

F

G

F

G

G

P

E

F

G

G

Weather Resistance

F

E

E

E

E

F

F

E

G

E

G

E

 

Topseals's fluorocarbon (FKM, FPM) O-rings are compatible with oils and gases, hydraulic oil and fuels.

 

Topseals's hydrogenated nitrile (HNBR, HSN) O-rings are very compatible with oils and gases 

                     

Topseals's ethylene propylene rubber (EPM, EPR, EPDM) O-rings are compatible with solvents and other chemicals. 

 

Topseals's silicone (VMQ) O-rings are very compatible with PFPE, cold water, and ozone. 

 

Topseals's polychloroprene rubber (CR) O-rings are compatible with oils and gases. 

 

Topseals's perfluoroelastomer ( FFKM) O-rings are very compatible with hydraulic oil and fuels. 

 

Topseals's nitrile rubber (NBR) O-rings are very compatible with oils and gases.   

 

Topseals's fluorosilicone (FVMQ) O-rings are very compatible with oils and gases.

 

 

RUBBER MATERIAL PROPERTY

 

 

FFKM perfluoroelastomer compounds are has excellent high temperature resistance and chemical resistance as PTFE, but also retains the relevant properties of rubber elastomer. It can be used continuously at 260 ° C to 300 ° C and at a high temperature of 325 ° C in a short time. Such excellent performance makes it widely used in military industry, aerospace, semiconductor, medicine, electronics, chemical industry and other fields.

 

 

FKM compounds are widely used in chemical, automotive, aerospace and industrial applications, Fluoroelastomer (Viton®, FKM) offers a wide range of resistance to chemicals, oil and heat, with situational service life above 200°C, with Excellent mechanical properties. Good extrusion resistance. Chemical and heat resistant.

 

 

NBR offers relative low cost, good mechanical properties, and resistance to many common oils, fuels and lubricants. NBR has poor resistance to weathering, sunlight and ozone so it is best used in enclosed environments where parts are not exposed to the elements.

 

 

HNBR Hydrogenated versions of NBR (HNBR) have enhanced mechanical properties as well as greater thermal and chemical stability. Specific physical properties and chemical resistances vary by compound formulation.

 

 

Silicone are excellent seal materials for extreme temperature in static applications. Outstanding flex and fatigue life, very good for ozone and UV radiation, insulating properties, and physiologically neutral. silicones can be synthesized with a wide variety of properties and compositions.

 

 

PTFE with Best chemical compatibility, low friction, meets FDA, USDA and 3-A dairy requirements, excellent moisture resistant and good cryogenic capabilities down to -350° F. Could be applied in Seals, bushings, back-ups, guides, pads, plugs, rollers, spacers, o-rings, wear rings, washers.