Silicon-based materials · Silicon metal

Silicon metal

Industrial silicon controlled by Si, Fe, Al, Ca and application-specific trace elements. After technical review it can be used in aluminium alloying and as upstream feed for silicones or further purification to polysilicon; actual grade, sizing and documents must be confirmed by application.

Silicon addition for aluminium alloyingUpstream feed for siliconesIndustrial-silicon feed for further purification

View grades and specifications

Product codeSI-METAL

Industry application1

Key indicatorsSi* · Fe · Al · Ca

Order boundaryQuotation and order confirmation

QUICK DECISION

Four answers before reading the technical detail

This section supports initial screening; final grade, addition and effects require operating conditions, formal documents and plant validation.

What it is

What it does

Silicon addition for aluminium alloying
Upstream feed for silicones
Industrial-silicon feed for further purification

Where it fits

Charge preparation or melt adjustment before final treatment and casting

Boundary not to miss

Incomplete dissolution, poor mixing, oxidation/dross or residual carry-in may cause chemistry deviation; wet feed entering the melt can create a severe safety hazard

SELECTION BOUNDARY

Start with the selection boundary

Silicon metal is distinct from ferrosilicon, silicon carbide, silica, silicones and polysilicon. Aluminium casting requires confirmation of the GB/T 2881 grade, Fe/Al/Ca limits, sizing and target alloy; silicone or polysilicon routes additionally require agreed B, P, C, Ti and other trace elements, reactivity and lot COA. The market names 421, 441 and 553 are search aliases, not guarantees until mapped to a formal SKU/TDS. Conventional steel silicon addition or deoxidation normally uses ferrosilicon; powder, 3N/4N, solar, electronic and battery grades are outside this general page's default supply scope.

PRODUCT MANUFACTURING

Product manufacturing process

Industrial silicon is generally carbothermically reduced from quartz and carbonaceous reductants in a submerged-arc or dedicated electric furnace, tapped into a ladle, refined, then cast, cooled, crushed, screened and tested into commercial lump or granule. Feed mix, furnace and refining practice vary by producer.

01Inspect and batch quartz, reductants and auxiliary feeds
02Carbothermic reduction in an electric furnace
03Tap into the ladle, refine and cast
04Cool, crush, screen and sample
05Test Si, Fe, Al, Ca, trace elements, sizing and pack

SPECIFICATIONS & PACKAGING

Grades, specifications, indicators and packaging

GB/T 2881—2023 distinguishes grades by Fe, Al and Ca limits; nominal Si = 100% − (Fe + Al + Ca). Market aliases 421, 441 and 553 are not complete order specifications; silicone or polysilicon routes additionally require agreed trace elements and reactivity.

01Confirm standard revision, formal grade and actual company SKU
02Check nominal Si, Fe, Al, Ca and application-specific trace elements
03Match lump, granule or separately reviewed powder to equipment and use
04Confirm moisture-protected pack, SDS, sampling method and lot COA

GRADES & SPECIFICATIONS

Grades, specifications, indicators and packaging

Supply specifications, packaging, lead time and quality documents are subject to the formal quotation and order confirmation.

Grade / family	Chemistry	Size and form	Packaging
Specification direction 01Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.79% Fe≤0.10% Al≤0.10% Ca≤0.01%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 02Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.58% Fe≤0.20% Al≤0.20% Ca≤0.02%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 03Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.37% Fe≤0.30% Al≤0.30% Ca≤0.03%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 04Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.40% Fe≤0.40% Al≤0.10% Ca≤0.10%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 05Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.30% Fe≤0.40% Al≤0.20% Ca≤0.10%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 06Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.10% Fe≤0.40% Al≤0.40% Ca≤0.10%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 07Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥99.20% Fe≤0.50% Al≤0.20% Ca≤0.10%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order
Specification direction 08Silicon metalConfirm grade, applicable standard and guaranteed values before quotation	Si*≥98.70% Fe≤0.50% Al≤0.50% Ca≤0.30%	Confirm against the addition method, equipment and order requirements	Confirm pack format, net weight and labels in the quotation and order

ORDER SPECIFICATION CONFIRMATION

What must be confirmed before this becomes an order specification

Supply specifications, packaging, lead time and quality documents are subject to the formal quotation and order confirmation.

01Confirm the product, grade, application and supply scope
02Fix guaranteed chemistry, sizing, form and packing in the quotation and order
03Agree sampling, test methods, acceptance rules and lot COA fields
04Confirm the required TDS, SDS/PSI, labels and delivery documents

SELECTION AND COMPARISON

Compare specification directions by indicators and operating conditions

Supply specifications, packaging, lead time and quality documents are subject to the formal quotation and order confirmation.

01Specification direction