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