Fast grade decision
The most useful first question is not only purity. It is application fit. Alloy and metallurgy buyers usually evaluate scale, consistency, and workable impurity limits. SOFC/SOEC, thin-film, and high-purity chemical buyers usually need tighter impurity review and may request additional testing before sample approval.
- 3N: industrial high-purity path for alloy and metallurgy programs.
- 4N: ultra-high-purity path for advanced materials and technical ceramics.
- Both: useful for distributors serving both industrial and research customers.
Documentation to request first
A practical first document set is the brochure plus the relevant reference analysis report. The reports should be used for technical review and should not be treated as official commercial certificates unless separate transaction documents are issued and confirmed.
- 3N inquiry: brochure plus 3N reference analysis report.
- 4N inquiry: brochure plus 4N reference analysis report.
- Mixed distributor inquiry: start with grade interest and customer application.