Materials Used

Rubbers or elastomers are mixed with various chemicals in order to provide the reinforcement and curing ingredients required to produce the physical properties necessary for the service conditions.

A wide choice of basic polymers (rubbers) is available, and some of these rubbers can be blended or compounded to obtain different properties.

ASTM Designation D1418-79	Common Name	Composition	General Properties
NR	Natural	Isoprene, natural	Excellent physical properties including abrasion and low temperature resistance. Poor resistance to petroleum-based fluids
IR	Polyisoprene	Isoprene, synthetic	Similar to natural rubber
SBR	SBR	Styrene-butadiene	Good physical properties and abrasion resistance. Poor resistance to petroleum-based fluids
CR	Neoprene	Chloroprene	Good weathering resistance. Flame retarding. Moderate resistance to petroleum-based fluids. Good physical properties
NBR	Buna N	Nitrile-butadiene	Excellent resistance to petroleum-based fluids. Good physical properties
IIR	Butyl	Isobutene-Isoprene	Very good weathering resistance. Excellent dielectric properties. Low permeability to air. Good physical properties. Poor resistance to petroleum-based fluids.
EPDM EPM	Ethylene-propylene rubbers	Ethylene-propylene-diene Ethylene-propylene	Excellent ozone, chemical, and aging resistance. Poor resistance to petroleum-based fluids.
FPM	Viton®, Flourel®	Hexafluro-propylene-vinyl idene fluoride	Excellent oil and air resistance at both high and low temperatures. Very good chemical resistance.
Source: Rubber Manufacturers Association Sheet Rubber Handbook, Third Edition