What is fumed silicone rubber? What are the advantages and disadvantages of fumed silicone rubber
Fumed silicone rubberis a common silicone raw material in the silicone products industry, but many people are not familiar with what fumed silicone rubberis. Most of the silicone products purchased are made of  fumed silicone rubber, so it is important to understand what fumed silicone rubberis and how it differs from other silicone materials? What is the difference between food grade silicone and food grade silicone? What are the advantages and disadvantages of fumed silicone rubber? Recommended reading: Precautions for selecting raw materials for silicone rubber products
So what is fumed silicone rubber?, Fumed silicone rubber, also known as high tensile silicone, mainly produces highly transparent silicone products. Compared with general silicone, it can produce products with high elasticity, high toughness, low compression and buffering deformation, and high anti yellowing effect. Fumed silicone rubber is a silicone made from silicon tetrachloride and silica obtained by air incineration, with a fineness of over 1000 mesh. The difference is the deposition method of silica gel, which uses sodium silicate mixed with sulfuric acid to deposit silica. The fineness is only 300-400 mesh.
The relationship between fumed silicone rubber and food grade and medical grade silicone. Fumed silicone rubber has many similarities with food grade and medical grade silicone, and can also undergo certain export testing and certification. However, after adding different vulcanizing agents, it will have different functions and inspection standards. Although fumed silicone rubber is similar to food grade silicone, it still needs to add vulcanizing agents to achieve vulcanization effect in order to pass the FDA testing and certification in the United States. However, the LFGB testing and certification in Europe and America are still uncertain.
The difference between fumed silicone rubber and deposition method silicone (generally silicone). Deposition method silicone will show whitening phenomenon when stretched, and the stretching degree is low, while fumed silicone rubber will not show whitening phenomenon when stretched. The stretching degree can reach about 500%. Silicon tetrachloride and silicon dioxide obtained by air incineration, with a fineness of over 1000 mesh, are produced by the deposition method using sodium silicate mixed with sulfuric acid to deposit the silicon dioxide. The fineness is only 300-400 mesh, so the price of fumed silicone rubber is significantly more expensive compared to general silicone in terms of performance.