Silicon rubber is a kind of highly active adsorption material, which is an amorphous substance. It is insoluble in water and any solvent, non-toxic and tasteless, stable in chemical properties, and does not react with any substance except strong alkali and hydrofluoric acid. The authenticity of silicone rubber can be identified by the following three methods:
1. From the feel, the toughness and elasticity of silicone rubber products are very good. It is not easy to be permanently deformed by external forces, and the feel will feel smooth.
2, from the characteristics of silicon rubber products are non-toxic, tasteless and colorless products, good texture, no harm to human body, and the general fake silicone products are difficult to achieve these effects, fake and inferior silicone products are generally toxic and pungent smell, but also relatively rough!
3, we can also put the true and false silicone rubber burning through the flame is also very effective, fake silicone products in the combustion of black smoke, the residue is black powder, real silicone products no matter what color burning of white smoke, burning residue is white powder.
Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, a clear, colorless, smoky, corrosive liquid with a sharp, pungent odor.Melting point -83.3℃, boiling point 112.2℃, density 0.888g/cm³.Soluble in water, ethanol, slightly soluble in ether.Hydrofluoric acid is theoretically a weak acid at a low concentration because of its relatively strong bond between hydrogen and fluorine atoms, which prevents it from being completely ionized in water.It is highly corrosive and can strongly corrode metal, glass and objects containing silicon.Burns that are difficult to heal if they are inhaled or come into contact with skin.Fluorite (calcium fluoride) and concentrated sulphuric acid are commonly used in laboratories, sealed in plastic bottles and kept in a cool place.
Silicon rubber Z high is synthesized by the United States with ferric chloride as catalyst.In 1945, silicone rubber products came out.In 1948, the silicone rubber reinforced with silica by gas phase method with high specific surface area was successfully developed, which made the performance of silicone rubber jump to the practical stage and laid the foundation of modern silicone rubber production technology.From the synthesis of dimethyl dichlorosilane began to produce silicone rubber countries have the United States.Russia, Germany, Japan, South Korea and China.The industrialization research of Silicone rubber in China began in 1957, and many research institutes and enterprises have developed various silicone rubber.By the end of 2003, China's production capacity of silicone rubber was 135 thousand tons, including 100 thousand tons of high-temperature rubber.
