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they melt it then mold it will still liquid!!!!!!!!!!!

Rubber is a thermoset (i.e., it hardens when heated and cannot melt) resin, the latex (i.e., uncured rubber), and a vulcanization agent are mixed and injected into the mold which is then heated to cure and vulcanize the rubber.

In making things like tires that need fiber belts, etc. molded into them, the latex is partially precured into wide ribbons by heat, then workers or machines wind alternating layers of latex ribbon, vulcanization agent, fiber belt, etc., the assembled tire is placed in a mold and heated to finish curing and vulcanizing the rubber.

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