Silicon Metal 5-5-3 is a metallurgical-grade silicon designated by its maximum impurity decimals: Fe ≤ 0.5%, Al ≤ 0.5%, Ca ≤ 0.3%, with Si ≥ 98.5%, supplied in 10-100mm lump. In aluminum casting it raises the alloy's silicon content to improve fluidity and reduce shrinkage, since silicon shortens the freezing range and feeds thin sections cleanly. The controlled Fe and Ca ceilings keep brittle intermetallic phases and inclusion counts low in the final casting. Primary uses span aluminum alloy casting (Al-Si secondary and foundry alloys), refractory formulations, and general foundry charge make-up. Typical silicon additions to hit Al-Si targets run roughly 4-12 wt% of the melt depending on the alloy (e.g. A356, ADC12-class), dosed against the charge analysis. The 553 grade balances purity against cost where ultra-low Fe is not required; tighter-Fe grades exist when needed. Each lot ships with COA (EN 10204 3.1) and MTC, XRF-verified, under multi-regional sourcing — CIF Marmara or Gebze bonded stock, 20 MT FCL. Send your alloy target and tonnage for a graded RFQ.
| Si | ≥ 98.5% |
| Fe | ≤ 0.5% |
| Al | ≤ 0.5% |
| Ca | ≤ 0.3% |
| Size | 10-100mm |
| Grades | Si 5-5-3 (Si ≥98.5%) |
| International Reference | Metallurgical grade 553 basis |
| Packaging | 1 MT jumbo big bag · Palletized · FCL container |
| Documentation | COA (EN 10204 3.1) · MTC · Radiation certificate · CoO · EUR.1 / A.TR (EU) |
| Quality Control | XRF · metallurgical grade verification |
| Minimum Order | 20 MT FCL / 5 MT LCL |
| Incoterms | FOB / CIF / CFR / DAP |
| Lead Time | Sea CIF 28-35 days · Gebze bonded stock 24-48h · alternative road/ferry 12-21 days |
International standards are a reference basis; certificates provided on request with document verification.
Silicon Metal 5-5-3 (Si 5-5-3)
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