The Challenge
EN 10204 3.1 is frequently specified as a default "just in case" requirement, without a clear understanding of what it actually adds over a simpler 2.2 declaration — or, in the opposite direction, is left unspecified on projects where it's genuinely required, creating a documentation gap discovered only at inspection.
Technical Breakdown
EN 10204 defines four inspection certificate types: 2.1 (declaration of compliance with the order, not based on specific inspection), 2.2 (test report based on non-specific inspection), 3.1 (inspection certificate validated by the manufacturer's own authorized inspector, independent of the production department) and 3.2 (validated additionally by the purchaser's or an independent third-party inspector).
The defining feature of a 3.1 certificate is independence: the inspection and validation must be carried out by a party within the manufacturing organisation that is independent of the manufacturing department itself — a 2.2 report has no such independence requirement.
A 3.1 certificate confirms the tested results relate specifically to the batch/heat of material supplied — this specific traceability, not just the test results themselves, is what distinguishes it from a generic test report.
3.2 certification adds third-party validation (by the purchaser's appointed inspector or an independent inspection body) on top of the manufacturer's own independent validation — typically reserved for the most safety-critical or contractually demanding applications, and usually involves witnessed inspection and additional lead time and cost.
Whether 3.1 is actually required should be driven by the project specification, code of practice or end-user standard in force — not applied by default, since requiring 3.1 across an entire BOM when only certain safety-critical components need it adds cost and lead time without a corresponding benefit.
Engineering / Procurement Checklist
What to define before requesting a quotation.
- Project specification or code of practice defining the required certificate type
- Which specific components genuinely require 3.1 (or 3.2) vs. a simpler 2.2 report
- Whether third-party witnessed inspection (driving 3.2) is contractually required
- Heat/batch traceability requirement matched to the certificate type requested
- Lead-time allowance for the additional inspection/validation step, where required