Certificate of Conformance Template: Required Fields and How to Issue One

Quick Answer

A Certificate of Conformance is a legal declaration confirming that a product meets all required specifications and contractual standards. In the metals and fabrication industry, CoCs serve a specific role in the quality documentation chain — they are typically issued by the fabricator or distributor when shipping finished goods, and they reference the underlying mill test certificates (MTRs) that validate the raw material.

Getting the format wrong — or missing required fields — creates problems at customer audits, government inspections, or ASME/ISO certification reviews. This guide covers the required fields, the EN 10204 certificate types, and the step-by-step process for issuing a compliant CoC.

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Certificate of Conformance Template: Required Fields

A compliant CoC for metals and fabrication must contain the following fields. Missing any of them creates a gap that auditors and customers will flag.

Header Information

Stakeholder Identification

Product Identification

Material Traceability (Critical for Metals)

Traceability back to the heat number is the element that distinguishes a metals CoC from a generic product declaration. Without it, the document cannot prove the raw material chain of custody.

Declaration of Conformity

A statement in this form:

"We hereby certify that the above material(s) conform to the requirements of [applicable specification(s)] and the purchase order referenced above. All test results referenced herein have been verified and are on file."

The declaration must be explicit about which specifications and standards the product conforms to.

Authorised Signatory

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EN 10204 Certificate Types and Which Applies to Your CoC

The European standard EN 10204 defines four levels of material certificate. Understanding which type your customer requires determines how your CoC must be structured and signed.

For most metals CoC applications:

• Type 2.1 is the minimum acceptable for commercial construction and low-risk applications
• Type 3.1 is required for pressure vessels, structural applications under code, and most fabrication CoCs that reference specific test data
• Type 3.2 is required for oil and gas critical service, nuclear, and aerospace applications where independent verification is mandatory

A common mistake: issuing a Type 2.1-format CoC for an application where the customer's purchase specification or the applicable code requires 3.1. The CoC passes internal review but fails the customer's incoming inspection.

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Step-by-Step: How to Issue a Certificate of Conformance

Step 1: Verify the Inbound MTRs

Before issuing any outbound CoC, verify that you have the original mill test certificates for all raw material that went into the product. Confirm:

• The heat numbers on the MTRs match the physical markings on the material
• The chemistry and mechanical values on the MTRs meet the applicable grade specification
• The EN 10204 certificate type on the MTR meets or exceeds what your customer requires

This is the foundational step. A CoC referencing unvalidated MTRs transfers liability without reducing it.

Step 2: Document Fabrication Records (if applicable)

If welding, forming, or other processing operations were performed, gather the supporting records that your CoC needs to cover:

• Welding Procedure Specifications (WPS) and Procedure Qualification Records (PQR)
• Welder Performance Qualification Records (WPQR)
• Non-Destructive Examination (NDE/NDT) reports (visual, radiographic, ultrasonic, magnetic particle, dye penetrant)
• Heat treatment records if stress relieving or PWHT was performed
• Dimensional inspection records

Step 3: Populate the CoC Template

Map the verified data into the CoC template fields. Cross-check that:

• Heat numbers on the CoC match the MTRs
• The specification reference on the CoC is the customer's actual required specification, not a similar one
• Quantities and part numbers match the purchase order exactly
• The certificate type (2.1, 3.1, etc.) matches what was contracted

Step 4: Obtain Independent Sign-Off (for EN 10204 3.1)

For EN 10204 Type 3.1, the signatory must be independent of the production department that manufactured the goods. A Quality Control Manager or Quality Inspector who does not report directly to the Production Manager meets this requirement. A Production Supervisor or Factory Manager does not.

Step 5: Attach Supporting Documentation

Most customer quality requirements expect the CoC to be shipped alongside the original MTR documents from the mill. Package:

• Your outbound CoC
• The originating MTRs (or certified copies)
• Any applicable NDE reports or supplemental inspection records
• Packing list and order references

Step 6: Log and Retain

Retain a copy of every issued CoC for the required period. ASME requirements typically call for 10–25 years depending on the application. ISO 9001 and AS9100 requirements vary by context. Organise retention so you can retrieve any issued CoC within minutes during an audit.

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How TestCert Automates CoC Generation

Manual CoC generation from the process above is manageable for low volumes. At higher volumes — or when serving multiple customers with different specification requirements — the manual approach creates risk at each step.

TestCert automates the critical path:

1. Inbound MTR validation: Chemistry and mechanical values are extracted and validated against built-in ASTM, ASME, EN, and API standards at intake — before any outbound CoC is generated
2. Customer specification overlays: Per-customer specification requirements are stored and applied automatically, so a CoC for Customer A (who requires A516-70) cannot be confused with a CoC for Customer B (who requires A516-60)
3. Automated CoC assembly: Outbound CoCs are generated from structured, validated data — not from PDFs or memory. Heat numbers, grades, and specification references pull from the verified inbound record
4. Signature workflow: CoC approval routing ensures the independent sign-off requirement is enforced before the document is issued
5. Audit-ready retention: Every issued CoC is retained with its supporting MTR records, linked by heat number, with an immutable audit trail

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