Silica gel is one of the best materials among all soft colloids. It is relatively comprehensive and high-quality in all aspects of characteristics, so many industries choose to use it as the main body or spare parts. Food grade and ordinary grade are also divided into gas phase grade and precipitation grade. The difference between the two is that the compound quality of the materials is different and the main body is basically the same.
For example, precipitated silica gel is mainly precipitated white carbon black, this white carbon black uses fuel gas to prepare the water glass made of Shi Yinsha and soda ash at high temperature to form a dilute solution with a high concentration. After adding a certain compound, it is cleaned, filtered and crushed to obtain precipitated white carbon black. The precipitated silicone rubber raw material obtained by adding silicone oil , silica and other substances.
The gas phase silicone is a gas phase silicone material obtained by using silicon tetrachloride combustion obtained by adding silicone oil, white carbon black, silicone and other substances. It is also called food-grade silicone . It has a high density and the fineness of silicon molecules can reach more than 1,000 mesh. Therefore, the product's tensile rebound and tear resistance are better than ordinary-grade silicone materials, but the price is also more expensive.
However, it is difficult for ordinary people to distinguish with their naked eyes whether silicone products are ordinary silicone materials or food-grade silicone materials. Then the only ways are to use techniques to identify them. For example, when the stretching rebound is produced, ordinary silicone will have a white mist shape, which is more obvious on the surface of the stretching point, while vapor-phase glue will not produce a white mist shape when stretching.
