A Certificate of Conformity attests that a product, batch, or shipment conforms to a specified standard, specification, or regulatory requirement. The standard might be an ISO standard, a national regulation, a buyer-specified contract specification, or a destination-country import requirement. CoC is a broad category, not a single document type: a CE Declaration of Conformity is one form of CoC, a pre-shipment inspection certificate from SGS is another, and a manufacturer’s self-declaration on letterhead is a third.
What a CoC tells you and what it does not
A CoC tells the buyer:
- What standard or specification was tested against, the named ISO, EN, GB, or contract specification
- Who performed the testing or assessment, the manufacturer, an accredited third-party lab, or a destination-country PSI agency
- The scope of the assessment, product-level, batch-level, or shipment-level
- The date and validity period of the certificate
A CoC does not tell the buyer:
- The actual measured values (the COA does that)
- The country of origin (the Certificate of Origin does that)
- The hazard classification (the SDS does that)
- The product is high quality, it certifies conformity to a stated standard, which the standard may set at a low or high bar
Country-specific CoC schemes (PSI / PVoC)
Several countries operate Pre-Shipment Inspection or Pre-Verification of Conformity schemes that require a CoC issued in the country of origin before the cargo can be imported. The most common ones in chemical trade:
| Scheme | Country | Issuing bodies (examples) |
|---|---|---|
| SASO PCoC | Saudi Arabia | TÜV, SGS, Intertek, Bureau Veritas |
| PVoC | Kenya | SGS, Intertek, Bureau Veritas, Cotecna |
| SONCAP | Nigeria | SGS, Intertek, Cotecna, China Certification & Inspection Group |
| ECTN / BSC | Multiple West African countries | Various, country-specific |
| BIS CRS | India (electronics, some chemicals) | BIS-recognised labs |
Cargo arriving without the required CoC is rejected at destination customs. The buyer pays for the cargo to be returned, destroyed, or held in port pending document remediation. For cargoes into these markets, the CoC is non-optional, must be arranged before shipment, and must be in the name of the destination importer. Late discovery of the requirement is one of the most common causes of cargo abandonment in trade with these markets.
For trade into the United States, the European Economic Area, Australia, Japan, and most other developed-economy destinations, no equivalent PSI scheme applies. CoC documents are still useful for buyer-side quality assurance but are not customs-required.
Who issues a CoC
Three issuer categories, with very different weight at customs and in dispute resolution:
- The manufacturer (self-declaration). The least authoritative. Useful for routine commercial purposes but not accepted as a PSI document under the schemes above. The CE Declaration of Conformity is a regulated form of self-declaration with specific documentation requirements behind it (see CE Mark).
- An accredited third-party certification body. SGS, Bureau Veritas, Intertek, TÜV, and others. Their certificates are accepted under most PSI schemes and carry weight in commercial dispute resolution. The CoC will reference the specific accreditation (ISO/IEC 17065, often) and the standard(s) tested against.
- A government or quasi-government conformity body. China Certification & Inspection Group (CCIC), SASO-licensed Saudi labs, and others. Required for some PSI schemes that mandate a specific issuer.
How to verify a CoC before accepting it
Three checks to run on every CoC received:
- The standard cited is the standard in your contract. A CoC against ISO 9001 (quality management system) is not a CoC against the product specification. Cargo can have an ISO 9001 CoC and still fail the spec.
- The issuing body is the issuing body the destination scheme requires. A SONCAP-bound shipment to Nigeria with a Cotecna CoC is fine; the same shipment with a CCIC-only CoC may be rejected at Lagos.
- The shipment details on the CoC match the shipment. Container numbers, shipping marks, batch numbers, and quantities on the CoC should match the bill of lading and the packing list. Mismatches mean the CoC was issued against a different shipment and is not valid for yours.
The CoC-as-quality-document misconception
Buyers occasionally accept a CoC as a substitute for a COA. This is wrong. A CoC says “this conforms to standard X.” A COA says “this batch was measured at these specific values.” The COA is what tells the buyer whether the actual cargo meets the buyer’s specific spec. The CoC tells the buyer whether the cargo meets a generic standard, which may or may not match the buyer’s spec.
For a chemical purchase order, both documents are usually needed. The CoC supports customs entry where required by the destination scheme. The COA supports the buyer’s incoming-quality acceptance.
Related terms
COA is the per-batch test report. Certificate of Origin is the country-of-origin attestation. CE Mark is a specific EU conformity scheme that produces an EU Declaration of Conformity. Third-party inspection is the broader category of CoC-issuance work performed by SGS, Bureau Veritas, and others.