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
Butyl, SBR, Natural rubber
Butyl, Ethylene Propylene
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