This is because unvulcanized silica gel is not only more sensitive to changes in external temperature. It becomes soft and sticky when it encounters high temperature and will be easily broken, and the smell will be very unpleasant.

Except for some thermoplastic silicones that do not require vulcanization, natural rubber and synthetic silicone rubber need to be vulcanized with vulcanizing agents. After vulcanization, silicone products are not soft when exposed to heat, and are not brittle when exposed to cold, and their performance is very good.

The general production and molding process of silicone products is produced by compression molding at a high temperature of about 180 degrees. Different types of rubber materials will leave different catalytic substances, so that the materials of silicone rubber products are mixed with the corresponding chemical compounds, which leads to the failure of testing and certification.
Therefore, usually the products that need to be tested, silicone rubber products factories will choose secondary vulcanization for treatment to meet the testing and certification standards, and the meaning of secondary vulcanization is to excessively vulcanize the vulcanized compounds in the product to maintain the interior of the product. Without any chemical hazardous substances.

web: China synthetic rubber supplier