The sequence that prevents mismatches
Start with the written product specification. The quotation should repeat the same SKU, grade, strength and pack. The contract should capture the agreed commercial terms. The invoice should match the seller, buyer and product basis. The packing list and shipment record should allow the delivered goods to be compared with the order.
COA, TDS and SDS are not one document
A COA reports tested results for a material or lot. A TDS explains material information. An SDS communicates hazard and handling information. Review the scope and issue date of each one, and do not assume that a general document applies to the lot being purchased.
Invoice and beneficiary checks
Before payment, compare the legal seller on the quotation, sales contract and invoice with the bank beneficiary. If a payment instruction changes, verify it through an independent known contact channel. Never rely on an email attachment alone.
Export transactions are supported with a commercial invoice. For an eligible domestic transaction, the applicable China VAT invoice and tax basis must be confirmed with finance for the actual seller, product and order; this website does not issue an invoice automatically.
Keep versions. Save the approved quotation and proof version, not just the final invoice. If product, quantity or packaging changes, request updated written documents.