Product Overview

Silicon Metal 441 is a standard grade designation in the global silicon metal market. The numbers "4-4-1" refer to the maximum impurity limits: Iron ≤ 0.4%, Aluminum ≤ 0.4%, and Calcium ≤ 0.1%. The balance is silicon, typically between 98.5% and 99.2%.

This grade is widely used in:

Aluminum alloy production (especially 6xxx series for extrusion profiles)
Silicone polymer manufacturing
Chemical intermediates (e.g., silanes, fumed silica)
High-purity ferrosilicon production

Our Silicon Metal 441 is produced in submerged arc furnaces using high-purity quartz and low-ash carbon reductants, followed by refined casting, crushing, and rigorous quality control.

Product Specifications

Below is the detailed parameter table for our Silicon Metal 441. All values are based on internal QC and third-party certified testing.

Parameter	Unit	Typical Value	Guaranteed Max
Silicon (Si)	%	98.8 – 99.1	≥ 98.5
Iron (Fe)	%	0.35 – 0.40	≤ 0.40
Aluminum (Al)	%	0.35 – 0.40	≤ 0.40
Calcium (Ca)	%	0.08 – 0.10	≤ 0.10
Phosphorus (P)	%	≤ 0.005	≤ 0.005
Sulfur (S)	%	≤ 0.003	≤ 0.005
Titanium (Ti)	%	≤ 0.02	≤ 0.03
Carbon (C)	%	≤ 0.05	≤ 0.08
Physical Form	–	Lumps / Granules / Powder	As specified
Standard Size	mm	10 – 100 (lumps), 0 – 3 (granules)	Customizable
Moisture	%	≤ 0.05	≤ 0.10

Key Advantages of Our Silicon Metal 441

✅ Consistent Chemistry

Each shipment is accompanied by a Certificate of Analysis (COA) from our ISO 17025-accredited lab. We maintain strict in-process sampling to ensure Fe, Al, Ca all remain within the 441 specification.

✅ Low Impurity Levels

Compared to standard grade 553 (Fe 0.5%, Al 0.5%, Ca 0.3%), our Silicon Metal 441 offers significantly lower calcium and tighter aluminum control – critical for aluminum alloy brightening and silicone stability.

✅ Customizable Sizing

We provide:

Lumps: 10–50 mm, 10–100 mm (for furnace charging)

Granules: 0–3 mm, 0–5 mm (for alloying and chemical reactions)

Powder: 200 mesh, 325 mesh (upon request)

✅ Reliable Supply Chain

With long-term contracts with quartz mines and dedicated furnace capacity, we ensure stable monthly shipments – even during peak demand seasons.

Applications in Detail

Industry	Role of Silicon Metal 441
Aluminum Alloys	Improves fluidity, strength, and corrosion resistance; essential for 6063, 6061 extrusion profiles.
Silicones	Reacted with methyl chloride to produce siloxane monomers for sealants, lubricants, and medical devices.
Chemicals	Used to produce fumed silica, silanes, and silicon tetrachloride.
Steelmaking	Acts as a deoxidizer and alloying agent in specialty steel grades.