Frequently Asked Questions

Silicon 553 and Silicon 441 differ primarily in their purity levels and impurity content. Silicon 553 has a purity of ≥98.5% with Fe ≤0.5%, Al ≤0.5%, and Ca ≤0.3%, making it ideal for aluminum alloy applications where standard purity is sufficient. Silicon 441, with ≥99% purity and lower impurity limits (Fe ≤0.4%, Al ≤0.4%, Ca ≤0.1%), is preferred for non-ferrous alloy production and organosilicon compounds where slightly higher purity is required.

Silicon 2202 is our highest purity grade with ≥99.5% silicon content and extremely tight impurity controls (Fe ≤0.2%, Al ≤0.2%, Ca ≤0.02%). It is specifically designed for applications that demand very low iron and aluminum content, including electronic component manufacturing, high-purity chemical synthesis, and solar silicon feedstock applications. Its superior purity makes it essential for specialized industries where impurity levels directly impact product quality.

Off-Grade Silicon 97 is a cost-effective option designed for applications where ultra-high purity is not required. With ≥97% silicon content and higher impurity tolerance (Fe ≤1.5%, Al ≤0.9%, Ca ≤0.3%), it is widely used in steel deoxidation, ferrosilicon production, and cost-sensitive alloy applications. If your process can tolerate higher impurity levels, Off-Grade Si 97 offers significant cost advantages without compromising performance for your specific needs.

Fe, Al, and Ca represent the primary impurity elements in silicon metal:

• Fe (Iron): Affects mechanical properties and corrosion resistance. Lower Fe content is critical for electronics and high-purity applications.
• Al (Aluminum): Influences thermal and electrical conductivity. Critical in semiconductor and chemical synthesis applications.
• Ca (Calcium): Affects material brittleness and processing behavior. Very tight control required for medical-grade and specialty applications.

Silicon purity grades are classified and named based on their maximum allowable impurity levels for these three elements.

We offer silicon metal in multiple standard particle sizes to suit different applications:

• 10–50mm: Standard lump size for most industrial applications.
• 50–100mm: Larger chunks for specific processing requirements.
• 10–100mm: Mixed size for flexible processing.
• Custom sizing: We can provide custom specifications to meet your exact requirements.

For inquiries about custom sizing, please contact our sales team.

Silicon metal is produced through a well-established industrial process: high-purity silica (quartzite) is reduced with carbon in large electric arc furnaces at extremely high temperatures. This reduction process removes oxygen and other impurities, resulting in crystalline silicon metal. The purity of the final product depends on the quality of raw materials, furnace conditions, and post-processing refinement.