The process of changing plastic rubber into elastic rubber is called vulcanization. A certain amount of vulcanizing agent, such as sulfur and vulcanizing accelerator, is added to the semi-finished product made of raw rubber, and heated and insulated in a vulcanizing tank at a specified temperature, so that the linear molecules of raw rubber are cross-linked with each other, and a solid network structure is formed by generating a "sulfur bridge", so that the plastic rubber material becomes vulcanized rubber with high elasticity. Because the cross-linking bond is mainly composed of sulfur, it is called "vulcanization".
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