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Silicon Metal 441 553
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Shape: Lump Powder Particles
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Chemical Composition:Si Fe Al Ca P
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Size:0~1mm 1~3mm 10mm~50mm 10~60mm 10~100mm .etc
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Package: Ton bag or customized according to customer requirements
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Product Introduction
Among industrial silicon, the silicon content of 553 is only about 98.5%, while that of 441 is 99%. Specifically, silicon metal is obtained by the high-temperature reaction of quartz and carbon in an electric arc furnace: Si02+C=Si+CO2. Quartz can be of poor quality (such as sea sand and sandstone) or of high quality (such as vein quartz). Carbon used as a reducing agent can also be of poor quality (such as charcoal) or of high quality (such as anthracite). The difference in these raw materials determines the purity of industrial metallic silicon. From a cost perspective, the higher the quality of the raw material, the more expensive it is.
Si441 and Si553 are the two most widely used and mainstream grades of silicon metal on the market. Their main differences are purity and price.
| Grade | Si Content | Iron | Aluminum | Calcium | Price |
|---|---|---|---|---|---|
| 553 | ≥98.5% | 0.5% | 0.5% | 0.3% | Benchmark |
| 441 | ≥99.0% | 0.4% | 0.4% | 0.1% | 5%-10% more expensive |
Note：If you are not sensitive to impurities, buy 553; if you have requirements for calcium and aluminum content, buy 441.
chemical composition
| Comparison Items | 553 | 441 | Explanation |
|---|---|---|---|
| Silicon Content | ≥98.5% | ≥99.0% | 441 has higher silicon content and fewer impurities. |
| Iron(Fe) | ≤0.5% | ≤0.4% | The difference is minor and has little impact on most applications. |
| Aluminum(Al) | ≤0.5% | ≤0.4% | 441 has lower aluminum content, making it more catalyst-friendly when used in organosilicon manufacturing. |
| Calcium(Ca) | ≤0.3% | ≤0.1% | This is the biggest difference. 441 has one-third the calcium content of 553, which is more beneficial for organosilicon and aluminum alloys. |
| Suitable for | Cost-sensitive applications | Quality-critical applications | Use 441 for high-performance applications and 553 for less demanding applications. |
Uses of silicon metal 441 553
1
Preparation of alloys Silicon-aluminum alloy is the silicon alloy with the largest usage. Silicon-aluminum alloy is a strong composite deoxidizer. It can replace pure aluminum in the steelmaking process to improve the utilization rate of the deoxidizer, purify the molten steel, and improve the quality of steel.
2
Manufacturing high-purity semiconductors Modern large-scale integrated circuits are almost all made of high-purity metallic silicon, and high-purity metallic silicon is also the main raw material for the production of optical fibers. It can be said that metallic silicon has become the basic pillar industry of the information age.
3
Production of silicone rubber, silicone resin, silicone oil and other organic silicones. Silicone rubber has good elasticity and high temperature resistance. It is used to make medical supplies, high temperature resistant gaskets, etc.
FAQ
Q: How much more expensive is 441 than 553? Is it worth it?
A: 441 is 5%-10% more expensive than 553, depending on the market. Whether it's worth it depends on your product positioning. For high-end products, spending more money on 441 is definitely worthwhile; for ordinary products, 553 is sufficient.
Q: 441 has so much lower calcium than 553, is it really useful for making organosilicon?
A: Yes, it is. Calcium is a poisoning agent for copper catalysts in fluidized bed reactors. The lower the calcium content, the longer the catalyst life. Many organosilicon plants have extended their catalyst replacement cycle from 3 months to 5-6 months after switching from 553 to 441.
Q: What are the advantages of using 441 over 553 for aluminum alloys?
A: Mainly iron and calcium. Iron forms a hard and brittle phase, affecting elongation; calcium affects fluidity. 441 has lower iron and calcium content, resulting in aluminum alloys with better ductility and less cracking.
Q: Is the quality of your 441 and 553 consistent across batches?
A: Consistency is paramount. We use a spectrometer to test each batch before it leaves the factory to ensure that compositional fluctuations are within a very small range. Material certificates are included with each shipment.
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