Buying high-purity aluminium: choose more than an N-grade
Choose 3N2, 3N5, 3N8, or 4N by defining total purity, critical elements, form, CoA, and project stage for a reviewable aluminium RFQ.
Open guideProcurement · Quality · Engineering
High-purity aluminium knowledge centre
Decision guides for a reviewable specification and defensible supplier comparison. Typical data is clearly separated from agreed limits.
Guides
From a purity target to a reviewable inquiry
Evidence-based guides to purity, quotation, CoA, supplier selection, and refining technologies for procurement, quality, engineering, and research.
What shapes a high-purity aluminium quotation
Factors that shape a high-purity aluminium quotation: purity, element limits, form, quantity, testing, packaging, logistics, and timing.
Open guideHow to request and review a Certificate of Analysis
Review a high-purity aluminium Certificate of Analysis: batch, Al, Si, Fe, Cu, Mn, Mg, Zn, Ga, method, units, and purchase specification.
Open guideA practical framework for evaluating a high-purity aluminium supplier
Compare high-purity aluminium suppliers by chemistry, batch evidence, capacity, change control, logistics, and RFQ response.
Open guideComparing segregation purification and zone refining
Compare directional solidification, secondary segregation, and zone refining by principle, scale, purity target, and procurement questions.
Open guideBilingual capability pack for internal circulation
Four pages covering product basis, typical batch data, RFQ fields, evidence identifiers, and direct contact. Prepared for procurement, quality, and supplier pre-qualification.
Download PDFVerified basis
Publicly documented product basis
4N5 only as a project target for review.
Not a blanket minimum order quantity.
Agree the acceptance specification separately.
No public fixed price or universal lead time.