| Feature | Certificate of Conformance (CoC) | Sigma Batch Certificate (EN 10204 3.1) | | :--- | :--- | :--- | | | "Pass/Fail" statement only | Actual numerical test results | | Traceability | General lot number | Specific batch/heat number | | Proof of testing | No raw data provided | Full chemistry and tensile data | | Legal liability | Low (manufacturer says compliant) | High (manufacturer provides evidence) | | Acceptability for critical use | No (e.g., structural steel, bridges) | Yes (mandatory) |
In manufacturing, “sigma” (σ) means standard deviation. In quality, “Six Sigma” means near perfection: 3.4 defects per million. But a Sigma Batch Certificate isn’t about marketing slogans. It’s about . sigma batch certificates
: Verification that the batch was manufactured under strict quality control protocols. | Feature | Certificate of Conformance (CoC) |
Six Sigma Certification: Benefits, Options, and How to Get Certified It’s about