Elastomer Designations

This table is intended to assist in understanding the ASTM D2000 Classification system, but is not considered to be part of the system. This table is not meant to be limiting; other elastomers may be used to meet the same Type & Class specification.

ASTM D2000 Material Designation
(Type and Class)
Elastomer Most Often Used
AAButyl, SBR, Natural rubber
BAButyl, Ethylene Propylene
BCNeoprene® (Chloroprene)
BENeoprene® (Chloroprene)
BFNitrile
BGNitrile, Urethanes
BKNitrile
CAEthylene Propylene
CEHypalon®
CHNitrile, Hydrin®
DAEthylene Propylene
DFPolyacrylate
DHPolyacrylate, HNBR
EEVamac® (Ethylene Acrylic)
EHPolyacrylate
FESilicone
FKFluorosilicone
GESilicone
HKViton® (Fluoroelastomers)
KKPerfluoroelastomers