Silicon metal 421 is listed for buyers who specify the 421 impurity code. Silicon content on the product page is approximately 98%; residuals are iron, aluminum and calcium.
Same furnace route as the other silicon-metal pages: silica reduced with carbon in a submerged-arc furnace. Sold as lump or granule with metallic luster. Used in aluminum alloys, as a deoxidizer in non-ferrous and special-steel melts, and as a chemical-industry silicon source.
Specification
| item | value |
|---|---|
| Grade | 421 |
| Si (approx.) | ~98% |
| Main residuals | Fe, Al, Ca (grade code 421) |
| CAS | 7440-21-3 |
| EINECS | 231-130-8 |
| Formula | Si |
| Molecular weight | 28.0855 |
| HS code | 2804.6900 |
No separate Fe / Al / Ca percentage table on the 421 product page.
Where it is used
- Aluminum-alloy catalysts and non-ferrous deoxidizers
- Special steel and silicon-steel alloying
- Dimethyl, amino, hydrogen and hydroxyl silicone oils and related auxiliaries
Process notes
- High melting point and heat resistance
- High resistivity; conductive when molten
- Brittle lump / granule with metallic luster
Questions buyers ask
Is 421 in stock as a separate lot?
It is a published catalog grade. Confirm lot and COA with sales; do not assume interchangeability with 553 or 441 without analysis.
HS code?
2804.6900 on the product page.
Packing?
1 MT big bag, 10–100 mm.
