Age resistance generally associated with products fabricated from various rubbers. This table, taken from MIL_HDBK-695C, is quite conservative. Maximum (up to 20 years) Silicone
Fluorocarbon Average (5 to 10 years) Hypalon
EPDM
Butyl
Neoprene
Polyether urethane
Hydrin Minimum (3 to 5) Nitrile, Buna N
SBR
Natural Rubber
Polyester urethane Use care when using and interpreting this table, because Nitrile when compounded using age resistance additives may have a shelf life of up to 10 years. In addition, warehousing environmental factors affect actual shelf life.
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