Silicone Molding Principle

- May 18, 2020-

Silica gel is a kind of highly active adsorbent material. It belongs to the material of amorphous tire. It is not easy to be water and any solvent. It is non-toxic and tasteless, and its chemical properties are stable. It does not react with any substance except strong hydrofluoric acid. Its chemical composition and physical structure determine that it has the characteristics that many similar materials are difficult to replace. It has high adsorption performance, good stability, stable chemical properties, and high mechanical strength.

Classification of silicone:

Silica gel can be divided into ordinary silica gel and gas phase silica gel. Ordinary silica gel is also known as precipitated silica gel. Its appearance is translucent, milky white, light yellow, gray, etc. Its hardness is between 40-70 degrees, because of its characteristics can be used in mobile phone buttons, miscellaneous parts, conductive adhesives and other silicone products.


Fumed rubber is also known as pure silica gel. It has good transparency, high tensile strength, high cost, and the hardness is usually between 40-60 degrees. Due to its own characteristics, it can be used to make silicone tubes, protective sleeves, etc. that require high elasticity. The product.

The principle of silicone molding process:

The principle of molding is to use high temperature and high pressure for a certain period of time to cause physical changes in the product. That is, by bridging the bridging agent, the originally free molecules are connected to each other to form a network structure, which is inseparable and formed. The products we need. Molding vulcanization is a high temperature and high pressure vulcanization type.

Hot vulcanization. It is usually carried out in two stages. The pre-vulcanization is carried out under pressure at a temperature between 150-160 degrees. The post-vulcanization is to remove the volatile components generated by the decomposition of peroxides and additives. It should be vulcanized in atmospheric hot air. 4 hours. In order to make vulcanization more stable and better physical properties, the post-vulcanization time can be 12 hours or longer.