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Elastomers

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Material properties apply to products manufactured to industry standards. Variations to the compounds may result in reduced capabilities.

 

Nitrile (NBR)

Trade Names:

Chemigum, Hycar, Krynac, Paracil, Perbunan

Description:

Most common and economical material. Good resistance to petroleum based oils, fuels, silicone grease, water and alcohols. Low compression set, high tensile strength, high abrasion resistance.

Temperature range:

-40°C to + 120°C (standard industrial compound)

Limitations:

Acetone, MEK, Cholinated and nitro hydrocarbins, strong acids, brake fluid, direct sunlight

Fluorocarbon (FKM)

Trade Names:

Viton, Flurel, Technoflon

Description:

Combines high temperature with outstanding chemical resistance. The ideal universal compound - but is expensive.

Temperature range:

-28°C to +200°C (standard industrial compound)

Limitations:

Low temperature flexibility, ketones, esters, ethers, nitro hydrocarbons

EthelynePropylene (EPDM)

Trade Names:

Nordel, Epcar, Vistalon, Epsyn, Royalene

Description:

Excellent outdoor weather resistance, ozone, auto brake systems and water. Good resistance to chemicals unsuited to NITRILE e.g: keytones, MEK, acetone, steam.

Temperature range:

-50°C to+120°C (standard industrial compound)

Polyurethane (PU) (AU)

Trade Names:

Too many to name

Description:

Outstanding abrasion resistance and tensile strength e.g. sealing high hydraulic pressures. Chemical compatibility similar to Nitrile.

Temperature range:

-50°C to +80°C (standard industrial compound)

Limitations:

Similar to Nitrile

Teflon (PTFE)

Trade Names:

Teflon

Description:

PTFE is inert to virtually all industrial chemicals - even at elevated temperatures.

Temperature range:

-180°C to +230°C (standard industrial compound)

Limitations:

Poor elastic memory, poor tear resistance, cold flows over time

Silicone (S) (MQ)

Trade Names:

Baysoline, Silastic, Silplus

Description:

Low compression set with high temperature range. Resistance to fungus, sunlight. Primarily used in static situations with high heat.

Temperature range:

-70°C to +200°C (standard industrial compound)

Limitations:

Low abrasion and tear resistance

Kalrez (FFKM)

Trade Names:

Kalrez

Description:

Combines toughness of an elastomer with chemical inertness of PTFE at very high temperatures. Less likely to cold flow than PTFE.

Temperature range:

-35°C to +310°C (standard industrial compound)

Limitations:

Non-standard o-ring grooves due to high coefficient of thermal expansion. Extremely expensive.