GENERAL PROPERTIES OF ELASTOMERS

The chart below shows the general characteristics of some of the common rubber compounds. Elastomers are mixed with various chemicals to provide a wide range of physical properties for specific service needs.

ASTM Designation Common Name Composition General Properties
CR Neoprene Chloroprene
  • Good abrasion resistance
  • Good weathering resistance
  • Good oil resistance
  • Flame retarding
NBR Nitrile
(Buna-N)		 Acrylonitrile-butadiene
  • Excellent oil resistance
  • Moderate oil resistance
IIR Butyl Isobutene-isoprene
  • Excellent weathering resistance
  • Good resistance to fire resistant fluids
  • Good heat resistance
  • Low permeability to air
  • Poor resistance to petroleum fluids
CIIR Chlorinated Butyl Chloro-isobutene isoprene
  • Similar to Butyl
SBR SBR Styrene-butadiene
  • Good abrasion resistance
  • Poor resistance to petroleum fluids
EPDM EPDM Ethylene-propylene diene terpolymer
  • Excellent ozone resistance
  • Good chemical resistance
  • Good temperature resistance
  • Poor petroleum characteristics
XLPE Cross-Linked Polyethylene Polyethylene and cross linking agents
  • Excellent chemical resistance
PA Nylon Polyamide
  • Good abrasion resistance
  • Good chemical resistance
  • Low coefficient of friction
CSM Hypalon. Chloro-Sulfonated Polyethylene
  • Excellent ozone resistance
  • Good abrasion resistance
  • Good heat resistance
  • Fair petroleum qualities
NR Natural Rubber Isoprene rubber (Natural)
  • Excellent abrasion resistance
  • Acid resistant
  • Not oil resistant
AFMU Teflon. Tetrafluro ethylene
  • Excellent high temperature resistance
  • Excellent chemical resistance
V-NBR Vinyl Nitrile PVC/NBR
  • Good ozone resistance
  • Good resistance to animal fats and oils
  • Good petroleum resistance

Teflon. and Hypalon. are registered trademarks of DuPont Dow Elastomers

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