GR-S rubber

GR-S rubber

[¦jē¦är′es ‚rəb·ər]
(organic chemistry)
Former designation for general-purpose synthetic rubbers formed by copolymerization of emulsions of styrene and butadiene; used in tires and other rubber products; previously also known as Buna-S, currently known as SBR (styrene-butadiene rubber).