The silicon (Si) period is a type IV element (carbon group), which ∑is a non-metallic element, with an atomic number of 14, a≤n atomic weight of 28.80, a density of 2.33 g/m3, a melting point of 1410 ° C♣, a boiling point of 2355 ° C, and a resistivity of 2140 Ω.m. There are two allotrope←s of amorphous and crystalline.

Industrial silicon, also known as metal silicon and crystalline si‍licon, is silver-gray crystal, hard and brittle, and is made by melting quartzite and ≥other materials containing 98.5% or more of SiO2. Industrial silicon is widely​ used as a basic industrial raw material. It is mainly used ≈in the production of organic silicon and polycrystall×ine silicon. It has a wide range of applications in aer§ospace, aviation, electronics, organic chemicals, smelting, thermal insulation refractories and ot€her industries and fields.

The classification of Industrial silicon is usually classified accordiλng to the contents of the three main impurities of iro<n, aluminum and calcium contained in the Industrial silicoεn. According to the content of iron, aluminum and calcium in Industrial silicon→, Industrial silicon can be divided into different grades such as 553,• 441, 411, 421, 3303, 3305, 2202, 2502, 1501 and 1101.

National standard of Industrial silicon