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4.8.2 Elastomers
An elastomer is considered any material, either natural or synthetic, that is elastic
or resilient, and in general resembles rubber in feeling and appearance. Basically,
an elastomer is a rubber-like material that can be or already is modified to a state
exhibiting little plastic flow and quick and nearly complete recovery from an
extending force. These materials are sometimes referred to as rubbers. Before
modification, an elastomer is referred to as a raw or crude rubber or a basic high
polymer. Table 4.12 provides the ASTM designation of elastomers.
TabLE 4.12
ASTM Designation of Elastomers
ASTM
Designation
Elastomer
ABR
Acrylate-butadiene
Butyl IIR
Butyl rubber; GR-1
XNBR
Carboxylic acrylonitrile-butadiene
FPM
Perfluoroelastomers; Chemraz 1 ; Kalrez 1
CIIR
Chlorobutyl rubber
EA
Ethylene-acrylic
ECTFE
Ethylene-chlorotrifluorethylene; Halar 1
EPDM
Ethylene-propylenediene; Nordel 1
EPT
Ethylene-propylene terpolymer
FKM
Fluoroelastomers; Viton 1 ; Fluorel 1 ; Technoflon 1
IR
Isoprene
NR
Natural rubber
Nitrile NBR
Buna Ν
BR
Polybutadiene
PE
Polyester; Hytrel 1
EU
Polyether urethane
AU
Polyurethane
SBR-styrene
Buna S; styrene-butadiene rubber
CR
Polychloroprene; neoprene 1
CSM
Chlorosulfonated polyethylene; Hypalon 1
ACM
Acrylate ester-acrylic halide
SBS
Styrene-butadiene-styrene
SEBS
Styrene-ethylene-butylene-styrene rubber
TPE
Thermoplastic elastomer
SI
Silicone rubber
FSI
Fluorosilicone rubber
HFP
Vinylidene fluoride; PVDF
ETFE
Ethylene-tetrafluorethylene
T
Polysulfide rubber
1 Registered trademark
Source: From Reference 13.