Silicon Metal
Silicon metal (industrial silicon) is the upstream raw material for the entire silicone industry chain, produced by carbothermal reduction of quartz in submerged arc furnaces. Grades include 553, 441, 421, 411, 3303, and 2202 (Fe-Al-Ca specs).
Key Properties at a Glance
| Common Grades | 553, 441, 421, 411, 3303, 2202 (GB/T 2881) |
|---|---|
| Si Content | ≥98.5% (553) to ≥99.99% (solar/electronic) |
| Iron Content | 0.4 – 0.5% (553) to ≤0.001% (5N) |
| Aluminum Content | 0.4 – 0.5% (553) to ≤0.001% (5N) |
| Particle Size | 10 – 100 mm (lump); 0 – 10 mm (granule) |
| End Uses | Aluminum alloy / silicone monomers / polysilicon / fumed silica / sodium silicate |
Range shown is category-wide; refer to individual grade COA for precise specs.
Featured Grades
Silicon Metal Grade 553
Silicon metal grade 553 is the most common Chinese commodity grade — Si ≥98.5%, Fe ≤0.5%, Al ≤0.5%, Ca ≤0.3%. The workhorse grade for aluminum alloy production and many chemical applications. Per GB/T 2881-2014.
Silicon Metal Grade 441
Silicon metal grade 441 — Si ≥99.0%, Fe ≤0.4%, Al ≤0.4%, Ca ≤0.1%. Higher purity than 553, preferred for premium aluminum alloys and silicone monomer production where lower iron and calcium content improve downstream chemistry.