Check that the supplier extrudes and finishes in its own plant, not only trades; ask for its business licence, the number of extrusion lines, its own die workshop and surface treatment lines, management and coating certificates, and recent export references. Approve samples before mass production, agree inspection before shipment, and agree payment terms tied to milestones.
| Check | What to ask for |
|---|---|
| Manufacturer or trader | Business licence, factory address, video or on-site visit |
| Capacity | Number of extrusion lines and press sizes, annual output |
| Dies | Own die design and workshop; who owns your die |
| Finishing | Own anodizing, powder, PVDF lines; coating approvals |
| Quality | ISO 9001, test reports, inspection records |
| Exports | Countries shipped to, references, export documents |
Red flags
Prices far below the market, no factory address, refusal of a video call or visit, and no sample before mass production.
Documents for import
Commercial invoice, packing list, bill of lading and certificate of origin are standard; some markets also need specific product certificates. Check your country's rules before ordering.
Questions
Can I visit the factory?
Yes. Baiyi's plant is in Daqiuzhuang, Jinghai District, about an hour from Tianjin city and close to Tianjin port.
Do you accept third-party inspection?
Yes, inspection such as SGS can be arranged before shipment.