cold rubber

noun
a synthetic rubber made at a relatively low temperature (about 40°F or 4°C) and having greater strength and durability than that made at the usual temperature (about 120°F or 49°C): used chiefly for retreading tires.

Origin:
1945–50

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World English Dictionary
cold rubber
 
n
synthetic rubber made at low temperatures (about 5°C). It is stronger than that made at higher temperatures and is used for car tyres

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He dipped the piece of rubber into the ice water, pulled it out, and demonstrated the fact that the cold rubber was stiff.
The cold rubber would not function as a gas-tight seal to keep the hot rocket exhaust away from the structure.
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