Ask three Chinese suppliers for "the certificate of conformity" and you can receive three different documents: a one-page slip printed by the factory's own QC office, a manufacturer's Declaration of Conformity written against EU directives, and a numbered certificate issued by an accredited inspection body under a destination country's import programme. All three are called a certificate of conformity in day-to-day trade. Only one of them is issued by anybody other than the seller.
That ambiguity is where import problems start. A buyer files a factory QC slip with a customs broker expecting it to clear a shipment, and it does nothing, because nothing outside the factory ever looked at the product. The document was not fake — it was simply not the document the border wanted. Reading these papers correctly takes about ten minutes per shipment, and the questions reduce to four: who issued it, who it was issued to, what exactly it covers, and whether it is still in force.
Three different documents, one name
Before checking anything, work out which of the three you are holding. They sit on completely different levels of evidence.
| Document | Issued by | What it actually proves |
|---|---|---|
| Factory certificate of conformity / 产品合格证 | The manufacturer's own QC department | The factory says this batch passed its internal checks. No external party is involved. |
| Declaration of Conformity (EU DoC / UK DoC) | The manufacturer, or the importer or authorised representative established in the market | A legally binding self-declaration that the product meets the listed legislation. Required for CE and UKCA marking. Still a self-declaration. |
| Certificate of Conformity under a destination conformity assessment programme | An accredited body appointed by the importing country's regulator | A third party verified the product against the destination's requirements before shipment. Usually mandatory for customs clearance in those markets. |
The third category is the one most buyers mean when they say a shipment "needs a CoC". Several markets run pre-shipment conformity programmes — Saudi Arabia, Kenya, Nigeria, Egypt and Algeria among them — where goods cannot clear without a certificate issued by a body the regulator has appointed. Those bodies are typically the large inspection houses: SGS, Bureau Veritas, Intertek, TÜV. The certificate is issued to a specific consignment or to a registered product under a licence, and the customs system in the destination country can look it up.
A useful discipline is to stop using the phrase at all in your emails. Ask for the named document instead: "the EU Declaration of Conformity under the EMC Directive", or "the SONCAP certificate for this consignment". Suppliers send what you name, and a vague request is what produces the QC slip.
Who issued it, and are they anybody
Read the issuer line first, because it decides how much the rest of the page is worth. If the issuing entity is the manufacturer, the document is a self-declaration regardless of how official the layout looks — holograms, stamps and serial numbers on a self-declaration are decoration. That does not make it worthless. Under CE marking legislation the manufacturer carries legal liability for a false declaration, which is a real deterrent. But it is a statement, not a finding.
If a third party issued it, the question becomes whether that party is accredited for the scope in question. Certification and inspection bodies are accredited by national accreditation bodies, and an accredited certificate normally shows the accreditation mark, the accreditation number, and a certificate number. Most of the large issuers run a public verification page where you type in the certificate number and see the record they hold. Use it. It takes under a minute and it is the only check in this article that a supplier cannot influence.
Watch for the layout that copies an accredited certificate's appearance without the accreditation reference — same border, same fonts, no accreditation number. That is a consultancy report dressed as a certificate. If you cannot find a number to verify, treat the document as a self-declaration and price the risk accordingly. The same logic runs through the management-system certificates a factory holds, which certify a system rather than a product, and through product certification marks such as CE and FCC, where the required evidence differs by product family.
Who it was issued to
The holder line catches more problems than any other field, and it is the one buyers skim. The entity named on the certificate should be the entity you are contracting with and invoicing through. Three mismatches recur:
- A different legal entity in the same group. The certificate names a sister company or a former trading name. It may be legitimate, and it may also mean the certified production line is not the line running your order.
- A trading company holding a manufacturer's certificate. The trader supplies documents obtained from one of several factories it buys from. Your goods may come from a different one.
- The certificate belongs to the component, not the product. A power supply inside your product carries its own certification. That does not certify the finished assembly.
This is the same verification problem as telling a factory apart from a trading company, arriving through the paperwork instead of the site visit. Where the holder does not match your contract party, ask directly and in writing why, and get the answer before the order rather than after the container is loaded. In component sourcing the equivalent discipline is documented traceability back to the authorised channel; a certificate that cannot be tied to the goods in front of you is decoration.
What it covers, and how narrow that is
Scope is written to be exact, so read it exactly. A certificate applies to a named model or model range, sometimes to a specific production batch, and to a specific set of standards. The failure mode is a certificate that is genuine, verifiable and simply about something slightly different from what is in the carton.
- Model identification. The model number on the certificate should match the model on the packing list and the label, character for character. A suffix change often signals a real design change.
- The standards cited, with their year. Standards are revised. A certificate against a superseded version of a standard is evidence about an older requirement, and a customs authority or retail customer may not accept it.
- The test report behind it. A certificate usually references a report number and date. Ask for the report itself. The report shows which samples were tested and which clauses were assessed, and it is where you discover that only one of your four variants was ever in the lab.
- Consignment or licence. Under pre-shipment programmes a certificate may be issued per consignment, which means last shipment's certificate does not clear this one. Under a registration or licence route it covers a period. Know which you have.
Where a spec was written loosely, the certificate will follow the loose spec. That is one reason two suppliers can both send valid paperwork and ship visibly different goods, and it connects directly to why quotes for the same specification come back different — an open spec is priced differently by each factory and certified differently too.
Whether it is still in force
Check the issue date, the expiry date if there is one, and whether the certificate depends on continued surveillance. Programme certificates and licences lapse. Self-declarations do not expire on their face, but they become stale in a way that matters: a Declaration of Conformity signed against a directive that has since been amended, or for a product that has since had a component substituted, no longer describes the product being shipped.
Component substitution is the common trigger and it rarely comes with an announcement. When a supplier changes a connector, an adhesive, a pigment or a power module, ask whether the declaration and the test evidence were revisited. A short written engineering change notice requirement in the purchase agreement is cheaper than a recall, and it belongs in the same list as the rest of the documents you request before a first order.
Where the paperwork check belongs in the process
Documents are checked twice: once before the order, on samples and on the supplier's existing certificates, and once before shipment, against the goods actually produced. The second check is the one that gets skipped. A pre-shipment inspection is the natural place for it, because the inspector is standing in front of the cartons and can photograph the labels and match them to the certificate. Building that into the pre-shipment inspection scope costs nothing extra and closes the gap between the certificate and the pallet.
Market requirements themselves vary more than most first-time importers expect, and the destination decides which of the three documents you need. A structured read of compliance requirements by destination market and of the broader import compliance picture is worth doing once per market rather than once per shipment. For chemical and cosmetic goods the pack is different again, built around safety data sheets and analysis certificates — the pattern is set out in the MSDS and CoA document pack.
ChinaMakersHub does not restate the validity of a supplier's certificates on the supplier's behalf. Where a certificate matters to your order, ask for the document that covers your model, check the issuer, the holder, the scope and the dates yourself, and keep the copy that was current on the day the goods shipped. Component buyers can start from Huihexin Technology's profile, a Shenzhen component distributor listed on the platform, and ask for documentation on the specific part numbers in the bill of materials rather than a general assurance. On the audit side, a certificate says nothing about the factory's day-to-day practice, which is what a factory audit actually examines.
Common questions
What is a certificate of conformity?
A certificate of conformity is a document stating that a product meets a defined set of requirements, but the term covers three quite different things in China trade: a factory's own internal QC pass slip, a manufacturer's legally binding self-declaration such as an EU or UK Declaration of Conformity, and a certificate issued by an accredited third party under an importing country's pre-shipment conformity programme. Only the third involves an independent party before the goods ship.
Because all three travel under the same name, name the document you want when you ask for it rather than using the generic phrase.
Is a Declaration of Conformity the same as a Certificate of Conformity?
A Declaration of Conformity and a Certificate of Conformity are not the same document: the declaration is issued and signed by the manufacturer, importer or authorised representative and is a self-declaration for which that party carries the legal liability, while a Certificate of Conformity under a destination conformity assessment programme is issued by a body the importing regulator has appointed, after that body has assessed the product. The first is a statement of responsibility, the second is a third-party finding.
Both can be genuine and required at the same time, for different purposes and different markets.
Who issues a certificate of conformity in China?
For CE and UKCA declarations the issuer is the manufacturer or the importer established in the destination market, not any Chinese authority; for pre-shipment conformity programmes the issuer is an accredited inspection body appointed by the importing country, typically SGS, Bureau Veritas, Intertek or TÜV operating in China. A factory can also issue its own internal conformity slip, which carries no external accreditation at all.
China Compulsory Certification, or CCC, is a separate scheme governing goods sold inside the Chinese market and is not an export document.
How do I check whether a certificate of conformity is genuine?
Find the certificate number and the accreditation reference on the document, then verify the number directly on the issuing body's own public verification portal rather than relying on the copy the supplier sent, and confirm that the entity named as holder is the entity you contract with. Then check that the model number, the standards cited and their revision years match your product and your market.
If the document carries no verifiable number, treat it as a self-declaration and decide whether that is enough for the risk in question.
Does one certificate of conformity cover every shipment?
Whether one certificate covers every shipment depends on the route it was issued under: a licence or registration route covers a product for a stated period, while a consignment route issues a fresh certificate for each shipment, so the previous certificate will not clear the next container. Read the certificate's own scope line, which states whether it is tied to a consignment, a batch or a period.
Where a component or material has been substituted since the document was issued, ask whether the underlying evidence was revisited, regardless of which route applies.