TABLE 1- RUBBER GROUP ‘A’ (ISO 2230:2002)
Rubbers with moderate susceptibility to deterioration by aging.

ABBREVIATION	CHEMICAL NAME	COMMON NAME
BR	Butadiene Rubber	Polybutadiene
NR	Isoprene Rubber, Natural	Natural Rubber
IR	Isoprene Rubber, Synthetic	Polyisoprene
SBR	Styrene-Butadiene Rubber	SBR
AU	Polyester Urethane Rubber	Polyurethane
EU	Polyether Urethane Rubber	Polyurethane

TABLE 2-RUBBER GROUP ‘B’ (ISO 2230:2002)
Rubbers with low susceptibility to deterioration by aging.

ABBREVIATION	CHEMICAL NAME	COMMON NAME
ACM	Copolymer Ethylacrylate	Arcylic
BIIR	Bromo-Isobutene-Isoprene	Bromobutyl
CIIR	Chloro-Isobutene-Isoprene	Chlorobutyl
CO, ECO	Polychloromethyloxiran	Epichlorohydrin
CR	Chloroprene Rubber	Neoprene
HNBR	Hydrogenated NBR	Hydrogenated Nitrile
IIR	Isobutene-Isoprene	Butyl
NBR	Acrylonitrile-Butadiene	Nitrile
NBR/PVC	Acrylonitrile-Butadiene & Poly	Nitrile/PVC
XNBR	Carboxylic-Acrylonitrile-Butadiene	Carboxylated Rubber

TABLE 3- RUBBER GROUP ‘C’ (ISO 2230:2002)
Rubbers which are highly resistant to deterioration by aging.

ABBREVIATION	CHEMICAL NAME	COMMON NAME
CM	Chloropolyethylene	Chlorinated Polyethylene
CSM	Chlorosulfonylpolyethylene	Chlorosulfon Polyethylene
EPDM	Ethylene Propylene	EPDM
FKM	Fluoro, Perfluoroalkyl	Fluorocarbon (Viton®)
MQ	Silicone
PVQ	Silicone
PVMQ	Silicone
Q	Silicone
VQM	Silicone

TABLE 4 - STORAGE PERIOD (ISO 2230:2002)

CLASSIFICATION	INITIAL STORAGE PERIOD	EXTENSION PERIOD
Group ‘A’	5 Years	2 Years
Group ‘B’	7 Years	3 Years
Group ‘C’	10 years	5 Years

(Note i: British & American Standards classify Group ‘C’ above as Group ‘X’ & should be refered to, for additional information on shelf life see ARP5316B. BS3574
Note ii: Storage at a 10ºC higher than normal tempurature will reduce the storage time by about 50%)