Every importer has heard a version of the same story: the quote was great, the samples were fine, and then the bulk order arrived with warped lids, mismatched colors or missing cartons — and the "factory" turned out to be a trading company three steps removed from production. Vetting a supplier properly before the first purchase order costs a few hours. Skipping it can cost a container. Here is a ten-point checklist we recommend to every buyer, including those evaluating us.
1. Confirm you are dealing with the actual factory
Ask directly: do you own the production facility? A real manufacturer can show you its injection-molding workshop, packaging lines and warehouse on a live video call — not just a meeting room or showroom. Request the factory address and check that it matches the company registration.
2. Ask for the business license and registration details
Chinese companies have a unified social credit code that can be verified against public registries. The registered scope of business should include manufacturing, not only trading.
3. Review third-party audit reports, not just logos
Certification badges on a website are easy to paste. Ask for the actual ISO 9001 certificate and BSCI audit report, check the company name on the documents, and confirm the dates are current. Serious suppliers expect this request and respond quickly.
4. Verify material claims with documentation
If a product is marketed as BPA-free or food-grade, the factory should be able to provide material data sheets from its resin suppliers. For food-contact items destined for the US market, ask how the material aligns with FDA food-contact requirements.
5. Check who owns the tooling
In-house mold development is a strong signal of a genuine manufacturer — it means faster modifications, tighter dimensional control and better confidentiality for your custom designs. If tooling is outsourced, ask where, and how engineering changes are handled.
6. Evaluate quality control in the process, not just at the end
Ask where inspections happen: incoming material, first article after mold setup, in-line during molding, and final random inspection before loading. A supplier who can describe this flow concretely usually runs it. Also confirm they welcome third-party pre-shipment inspection — hesitation here is a red flag.
7. Test communication speed and precision early
The way a supplier handles your first technical question predicts how they will handle a production problem at 2 a.m. your time. Clear answers, stated assumptions and one-business-day responses matter more than perfect English.
8. Look at packaging capability, not only the product
US retail and e-commerce have specific needs: color boxes, barcodes, FBA-compliant poly bags and labeling, carton drop standards. A factory with its own packaging lines can control this; one that outsources packing adds another failure point.
9. Start with a sample, then a trial order
Approve a sample for color, finish, function and packaging before mass production — then place a smaller first order even if the unit price is slightly higher. You are buying information about how the supplier performs under a real PO.
10. Agree terms in writing before the deposit
MOQ, lead time, Incoterms, payment schedule, defect allowance and what happens if inspection fails — all of it belongs in the proforma invoice. Ambiguity before payment becomes leverage you no longer have after payment.
Yazhen operates its own 12,000 m² facility in Taizhou with in-house molding, packaging and warehousing, and we are glad to walk any prospective buyer through every point above — documents included. See our quality and compliance details → or start the conversation.