• Composition: Max 1.0% Iron (Fe), Max 0.1% Aluminum (Al), Max 0.1% Calcium (Ca).
• Purity: This is a high-purity grade. The extremely low levels of impurities, especially Aluminum and Calcium, are crucial.
• Primary Applications: Used where exceptional purity is non-negotiable. This includes:

1. Solar Grade Silicon (SoG-Si): The base material for photovoltaic cells in solar panels.
2. Semiconductors: Essential for electronic components and chips.
3. Specialized Silicones & Chemicals: High-performance silicones requiring low catalyst poisons.

• Cost: Generally commands a higher price due to the stringent refining processes required.

Silicon Metal 441:

• Composition: Max 4.0% Iron (Fe), Max 4.0% Calcium (Ca), Max 1.0% Aluminum (Al). (Note: The “441” typically implies max 4% Fe, 4% Ca, 1% Al, though minor variations exist; always confirm specs).

• Purity: A standard purity grade with higher tolerance for impurities compared to 1101.
• Primary Applications: Used in applications where the highest purity isn’t essential but consistent quality is vital. Dominant uses include:

1. Aluminum Alloying: The primary consumer. Added to molten aluminum to improve strength, castability, and fluidity.
2. Chemical Industry: Production of silicones (where lower purity suffices) and silanes.
3. Foundry: As an inoculant or deoxidizer.

• Cost: Typically more cost-effective than 1101, offering excellent value for its core applications.