Metallic element, element symbol sb, atomic number 51. It is a kind of metal like metal with metallic luster, which mainly exists in the sulfide mineral stibnite (Sb2S3) in nature. Antimony compounds are known to have been used as cosmetics in ancient times, and metallic antimony has been recorded in ancient times, but at that time it was mistaken for lead. Around the 17th century, antimony was known as a chemical element.
A shiny, hard, brittle metal (often made into bars, blocks, powders, etc.). It has scaly crystal structure. In the moist air, it gradually loses luster, and in the strong heat, it burns into the oxide of white antimony. Soluble in aqua regia, soluble in concentrated sulfuric acid. Relative density is 6.68, melting point is 630 ℃, boiling point is 1635 ℃, atomic radius is 1.28 Å, electronegativity is 2.2.
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The main use of antimony is that its oxide antimony oxide is used to make refractories. In addition to halogen-containing polymer flame retardants, it is almost always used with halide flame retardants. The formation of antimony halide from antimony trioxide can slow down combustion, which is the reason why it has flame retardant effect. These compounds react with hydrogen atoms, oxygen atoms and hydroxyl radicals, which eventually extinguish the fire. These flame retardants are used commercially in children's clothing, toys, airplanes and car seat covers. It is also used as an additive of polyester resin in the glass fiber composite (commonly known as FRP) industry, such as the engine cover of light aircraft. When the resin burns in the fire, but the fire is put out, its combustion will stop automatically.
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