Silicon metal 441 is the same industrial silicon family (~98% Si) classified by iron, aluminum and calcium. Buyers who write 441 on the PO use this listing rather than 553.
Produced by carbon reduction of silica in a submerged-arc furnace. Lump or granule, silver-grey to dark grey. Applications match the rest of the silicon-metal line: aluminum alloys, special steel, and silicone intermediates. Choose 441 when the melt or chemical process specifies that grade code.
Specification
| item | value |
|---|---|
| Grade | 441 |
| Si (approx.) | ~98% |
| Main residuals | Fe, Al, Ca (grade code 441) |
| CAS | 7440-21-3 |
| EINECS | 231-130-8 |
| Formula | Si |
| Molecular weight | 28.0855 |
| HS code | 2804.6900 |
Product page does not publish a numeric Fe / Al / Ca table. Grade article on the site lists 441 among standard codes.
Where it is used
- Aluminum alloys and non-ferrous deoxidation
- Special steel / silicon-steel addition
- Silicone oils and related chemical intermediates
Process notes
- Same physical description as other silicon-metal pages on this site: high melting point, heat resistance, high resistivity, brittle
- Specified when the purchase order calls for grade 441 rather than 553 or 421
Questions buyers ask
441 vs 553 vs 421?
All three are industrial silicon at about 98% Si. The difference is the Fe / Al / Ca grade code the buyer specifies. Ask the desk for a COA against your code.
Size?
10–100 mm, 1 MT big bag.
Other grades mentioned on the site?
The grade article also names 411, 3303, 3305, 2202, 2502, 1501 and 1101. Confirm availability before treating those as stock items.