Metal silicon is a product smelted from quartz and coke in an electric furnace. The main component of silicon is about 98% (99.99% of Si is also contained in metallic silicon), and the remaining impurities are iron, aluminum, calcium, etc.. Semiconductor silicon is used to make high-purity metal silicon for semiconductor devices. It is sold in the form of polycrystalline and single crystal, the former is cheap and the latter is expensive. It is divided into a variety of specifications due to its different uses.
| Garde | si | Fe | Al | Ca |
| ≥ | ≤ | |||
| 1101 | 99.79% | 0.10% | 0.10% | 0.01% |
| 2202 | 99.58% | 0.20% | 0.20% | 0.02% |
| 3303 | 99.37% | 0.30% | 0.30% | 0.03% |
| 441 | 99.10% | 0.40% | 0.40% | 0.10% |
| 553 | 98.50% | 0.50% | 0.50% | 0.30% |
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