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What is the Classification of Silicon Metal?

Release Time: 2024-09-24
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Silicon metal is typically classified into different grades based on the amount of impurities, specifically iron (Fe), aluminum (Al), and calcium (Ca). The grades are defined by their chemical composition, and the common ones include:

  • Silicon Metal 553

Fe ≤ 0.5%, Al ≤ 0.5%, Ca ≤ 0.3%

The most economical grade, widely used in aluminum alloys and the chemical industry.

  • Silicon Metal 441

Fe ≤ 0.4%, Al ≤ 0.4%, Ca ≤ 0.1%

Higher purity than 553, commonly used in applications requiring more stringent quality control, such as in aluminum casting and solar industries.

  • Silicon Metal 3303

Fe ≤ 0.3%, Al ≤ 0.3%, Ca ≤ 0.03%

A high-purity grade used in the production of specialized aluminum alloys and the chemical sector.

  • Silicon Metal 2202

Fe ≤ 0.2%, Al ≤ 0.2%, Ca ≤ 0.02%

Very high purity, typically used in electronic and photovoltaic applications, such as the production of solar-grade silicon.

  • Silicon Metal 1101

Fe ≤ 0.1%, Al ≤ 0.1%, Ca ≤ 0.01%

Ultra-pure grade, mainly for the production of polysilicon used in semiconductors and solar panels.

 

These are the most common specifications. However, there are also other special grades that might be tailored to specific industrial applications or requirements. The lower the impurity levels, the higher the grade and price.

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