Evidence should attach to the quoted lot.
A credible quality review connects material identity, specification, analytical scope and the commercial record.
Specification
Material name, grade, key parameters, pack and the version used in the quotation.
Batch COA
Product and lot identity, tested parameters, methods, results and applicable limits.
Independent testing
A separate agreed laboratory, sample, method, acceptance criteria, cost and timing scope.
Commercial record
Written quote, contract, invoice and packing list aligned with the product being released.
What the file can and cannot prove
Does a COA from one lot cover another lot?
No. Confirm whether the report is tied to the lot being supplied and whether its methods and limits apply to the agreed specification.
Does an SDS confirm market approval?
No. An SDS communicates hazard and handling information. Import, possession and resale requirements remain destination-specific.
Can a factory visit replace analytical testing?
No. A visit supports due diligence, but product identity and purity require the agreed specification, batch evidence and any independent testing.