GR-S
noun
¦jēˌär¦es
variants
or less commonly GR-S rubber
: any of a class of general-purpose synthetic rubbers that are made by copolymerizing emulsions of butadiene and styrene commonly at a temperature of either 122° F or 41° F and that are used especially in tires see cold rubber
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Merriam-Webster unabridged
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