Rubber Materials

Rubber is known for its memory. Rubber has the tendency to move back to its original shape after being deformed, making it an excellent sealing material for static and light dynamic applications.

FKM (Viton®)

Fluorcarbon

Also referred to as fluoroelastomers, fluorocarbon compounds are thermoset elastomers containing fluorine. Fluorocarbons make excellent general purpose O-rings.

Temp range:      -25° tot +204° C
Relative cost:                  •••

NBR,

Nitrile

Nitrile rubber is the most commonly used elastomer for O-rings and other sealing devices. Also known as Buna N, nitrile is a copolymer of butadiene and acrylonitrile (ACN).

Temp range:      -40° tot +108° C
Relative cost:                  ••

FFKM (Fluorezi®) Perfluoroelastomer

FFKM has a fluorine content of more than 71%. These perfluoroelastomers with a higher fluorine content have a better chemical and heat resistance than standard fluoroelastomers do.

Temp range:      -30° tot +325° C
Relative cost:                  ••

EPM, EPDM, Ethylene Propylene

Ethylene propylene is a copolymer of ethylene and propylene (EPM), or, in some cases, a terpolymer due to the addition of a diene monomer (EPDM).

Temp range:      -55° tot +150° C
Relative cost:                  ••••

VMQ, Silicone

Silicones are very resistant to oxygen, ozone, and UV light. They also have great flexibility retention and low compression set.

Temp range:      -25° tot +204° C
Relative cost:                  ••

FVMQ, Fluorosilicone

Fluorosilicone is the common name for fluorovinylmethyl silicone rubber. Fluorosilicones combine the best properties of fluorocarbons and silicones.

Temp range:      -55° tot +180° C
Relative cost:                  ••••

FEPM, Tetrafluoroethylene Propylene

The FEPM designation was originally directed at copolymers of tetrafluoroethylene (TFE) and propylene (P). TFE/P provides a unique combination of chemical, heat, and electrical resistance.

Temp range:      -20° tot +204° C
Relative cost:                  ••

HNBR, Hydrogenated Nitrile

Hydrogenated nitrile results from the hydrogenation of standard nitrile. Hydrogenation is the process of adding hydrogen atoms to the butadiene segments.

Temp range:      -30° tot +150° C
Relative cost:                  ••

PU, Polyurethane

Polyurethane is the toughest, most extrusion-resistant, and most abrasion-resistant of all elastomeric sealing materials.

Temp range:      -50° tot +108° C
Relative cost:                  •••

CR, Chloroprene

Chemically known as polychloroprene but often referred to by the trade name Neoprene®, chloroprene was one of the first synthetic materials developed as an oil-resistant substitute for natural rubber

Temp range:      -40° tot +121° C
Relative cost:                  ••••

Chemical resistance guide

FKM NBR FFKM EPDM VMQ FVMQ FEPM HNBR
Inorganic acids B C A B C C A C
Organic acids C B A B B D C B
Alkalis B B A D B B A B
Amines D D A B A D A A
Steam B D A B B C A C
Ketones D D A B C D D D
Esters D D A B B D D D
Ethers D D A D A A D A
Aldehydes D C A C B D D D
Alcohols B B A C A A A A
Aliphatic Hydrocarbons A C A D D A B A
Aromatic Hydrocarbons A C A D D C D D
Sour gas B C A D C C A C
Lubricents A B A B A A A A
Fluorinated fluids D C D C D A
  • A = Excellent
  • B = Good
  • C = Average
  • D = Not reccomended

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