baby pacifier clip manufacturer.The difference between fumed silica gel products and precipitation silica gel products!

　　Recently, our company has been producing products that have been tested and certified for export, so high-performance raw materials have always been used for the selection of raw materials. In order to meet the required standards, we have always used food-grade silica gel, imported silica raw materials, gas-phase method silicone rubber, etc. Production of products, so for customers with different needs, products with different needs will choose different materials. For fumed silica gel, it is also a common raw material in the silicone rubber product industry. It has different characteristics due to other silica raw materials. Have you figured out the raw materials and properties of the silicone products you purchased?

　　Gas-phase method silica gel has many similarities with food-grade and medical-grade silica gel, and can also pass some export inspection certifications, but after adding different vulcanizing agents, it will have different effects and inspection standards. Although gas-phase method silica gel is similar to Food-grade silicone is familiar but still needs to add a vulcanizing agent to achieve the vulcanization effect to pass the US FDA testing and certification, but it is still uncertain about the European and American LFGB testing and certification. Gas-phase silica gel, also known as high-tensile silicone rubber, mainly produces high-transparency silicone products. Compared with ordinary silica gel, it can make products with high elastic glue, high toughness, low compression buffer deformation, and high anti-yellowing effect, so many friends who don’t know call gas-phase method silica gel as food-grade silica gel, and food-grade silica gel whether it is Any material that can pass FDA, ROHS, and LFGB testing and certification can meet the standard of food-grade silicone.

　　The difference between the fumed silica gel (gas-phase glue) and the precipitation silica gel (ordinary silica gel) can be distinguished from one point. There will be no whitening phenomenon when it is used, and the stretch can reach about 500%. The silicon dioxide obtained by burning silicon tetrachloride and air has a fineness of more than 1000 mesh. The precipitation method is to use sodium silicate to add sulfuric acid to precipitate the silicon dioxide. The fineness is only 300-400 mesh. Therefore, the price of fumed silica gel is obviously higher than that of ordinary silica gel in terms of performance.

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