When sourcing primary and secondary amines from Chinese manufacturers, compare suppliers against the exact grade you need, not just a broad product description. Confirm the chemical name, assay, water content, color, and relevant impurity limits in writing. A small mismatch matters. Request a recent certificate of analysis and check that its methods and limits match your purchase specification. Ask for evidence.
Packaging and shipment details deserve equal attention. Confirm container material, seal type, net weight, labeling, and storage conditions, especially for moisture-sensitive grades. Ask how production batches are identified and whether retain samples are kept. A clear sample approval process can reveal differences in odor, color, or handling before a larger order. It is a practical step, not a guarantee.
Assess the manufacturer’s quality controls, production capacity, and ability to communicate changes in raw materials or lead times. Review safety data and transport documents, and verify that the proposed packaging and route suit your destination. A low quote can hide costs in testing, delays, or inconsistent batches. Still, no checklist catches everything. I would also ask specific questions and judge how directly the supplier answers them; a polished brochure is not proof of dependable production.