How we verify a factory
Verification here means checking public records, labelling the strength of each source and recording the review date. It does not mean a site audit. A published profile is not a guarantee of factory ownership, certification validity or in-house production.
What we check
- The registered legal entity and the unified social credit code in the business registry.
- Whether the stated production address belongs to that entity, not only to a group parent.
- The UL file number, its holder and the recognised manufacturing location.
- Capability figures for a named product series, with the source of each one.
- Which process steps the factory says are subcontracted.
- Public environmental permit records for the production site.
The four evidence levels
| Official sources reviewed | The claim is supported by a primary public record such as a business registry entry, a UL file or a permit. |
|---|---|
| Independently reviewed | The claim has been checked against a source outside the manufacturer's own materials. |
| Manufacturer reported | The claim comes from the manufacturer's own website, datasheet or written statement and has not been independently checked. |
| Unclaimed listing | A placeholder record with no verified capability claims. It is never presented as a qualified supplier. |
What we do not claim
A website statement alone does not prove factory ownership or that manufacturing is performed in-house. We do not upgrade a listing simply because a company is well known, and we do not publish reviews or aggregate ratings. We also do not merge the highest layer count, finest line width and smallest drill published anywhere on a website into one capability package, because those numbers usually come from different processes.
Do your own checks too
Use the buyer verification checklist and the UL certification guide. Outbound evidence links on our profiles are left followable so you can repeat the same lookup.