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Product Info for Plasticoid Black Rubber Stoppers, Solid 5--M290, Pack
These solid, black stoppers contain a high percentage of pure rubber, weigh less than neoprene, and are low in free sulfur (1/2%). Composition ensures resiliency and pliability over a long period. Withstand laboratory conditions without hardening.
Specifications for Plasticoid Black Rubber Stoppers, Solid 5--M290 :
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