What is the difference between gas-phase silica gel and precipitated silica gel

Liquid silicone is divided into two types: gas-phase silicone and precipitated silicone. There are certain differences in the production process, product performance, and application scope between these two types of silicone. Below, HANAST Liquid Silicone Manufacturer will take you to understand in depth the differences between gas-phase silicone and precipitated silicone.
1、 Production process
Gas phase production uses silicon tetrachloride and air combustion to produce silica with a fineness of over 1000 mesh. Precipitation production uses sodium silicate added with sulfuric acid to precipitate silica with a fineness of only 300-400 mesh.
The white carbon black produced by the gas-phase method is expensive and not easily hygroscopic. Used as a dull agent in coatings. Precipitation method white carbon black is inexpensive and easy to absorb moisture. Can only be used for filling and reinforcing rubber and plastic products.

2、 Product performance
When the liquid silicone gel of the precipitation method is stretched, it will turn white and cannot be stretched for a long time, while in the gas phase, it is different. No matter how the gas phase is pulled, it will not turn white and can be stretched for a longer time without breaking. A good gas-phase adhesive can be pulled up to over 700%, and the transparency of gas-phase adhesive is higher than that of precipitated adhesive.
The tensile strength, tear strength, and elongation of silicone rubber reinforced with fumed silica are better than those reinforced with precipitated silica. Transparency of gas-phase method. The opacity or translucency of the precipitation method.
The cost of silicone rubber produced by the gas-phase method is higher than that produced by the precipitation method, so the tensile and tear elongation of gas-phase adhesive with the same hardness is better than that of precipitation adhesive, and its environmental protection index is also higher. Gas phase silica gel is generally addition-molded 10:1 transparent silica gel, while precipitation silica gel is generally addition-molded 1:1 transparent silica gel.
3、 Scope of use
Gas phase silicone has good tear resistance and is suitable for products inside sleeves, pressure cookers, silicone wires, and so on; The precipitation method of silicone has a good impact life and is suitable for remote control buttons, mobile phone buttons, foot mats, etc.