Key takeaways
- Identify the product, batch or lot number, manufacture date and expiry or retest date.
- Use four columns: parameter, test method, specification limit, actual result.
- State units and the method reference for every parameter — a bare number is not a result.
- Add a clear conforms / does not conform conclusion.
- Sign off with a named authorised signatory, position and issue date.
Fields the COA template needs
| Block | Fields | Why it matters |
|---|---|---|
| Header | Issuer name and address, document number, issue date | Identifies who is certifying and when |
| Product | Product name, grade, product code, packaging | Ties the certificate to a sellable item |
| Batch | Batch or lot number, manufacturing date, expiry or retest date, quantity | Makes the certificate traceable to physical stock |
| Results table | Parameter, method, specification, result, unit | The substance of the document |
| Conclusion | Conforms / does not conform statement, remarks | Tells the buyer whether to accept the batch |
| Sign-off | Authorised signatory name, position, signature, date | Assigns responsibility for the results |
How to build the results table
- List parameters in the same order as the product specification so the two can be read side by side.
- Give the method for each parameter — a standard reference or an internal method number.
- State the specification as a limit, a range or a typical value, and say which it is.
- Enter the measured result with its unit, at the precision the method supports.
- Mark any parameter that was not tested for this batch instead of leaving the cell blank.
Never report a result more precisely than the method allows, and never copy the specification into the result column. Both are treated as red flags during supplier audits.
Product-performance blocks some buyers expect
- A preparation or formulation block, where the batch was tested in a defined mixture.
- A performance or rheology block, where behaviour is measured under stated conditions.
- Storage and handling notes, if results are condition-dependent.
- A retest interval, where the product's properties drift over time.
Keep these blocks separate from the main specification table. Mixing indicative performance figures into the specification results makes it unclear which numbers the batch is actually being released against.
Where the COA sits in the document set
The certificate of analysis is issued at release, before dispatch, and travels with the shipment together with the safety data sheet and the technical datasheet. For a border crossing it accompanies the commercial invoice, packing list and certificate of origin. The product name, code and batch number must be identical on every one of them.
How to use a certificate of analysis template
Step 1: Enter issuer and document details
Add your company details, certificate number and issue date.
Step 2: Identify the product and batch
Enter product name, grade, code, batch number, manufacture and expiry dates.
Step 3: Set up the results table
Add parameter, method, specification and result columns in specification order.
Step 4: Enter measured results
Record each result with its unit at the precision the method supports.
Step 5: State the conclusion
Add the conforms or does not conform statement and any remarks.
Step 6: Sign and issue
Add the authorised signatory and export a print-ready certificate.
Frequently asked questions
What is the difference between a COA and a technical datasheet?
A technical datasheet gives typical properties of the product in general. A certificate of analysis gives measured results for one specific batch, with the test methods and limits used to release it.
Does a COA need a signature?
Yes in practice. Buyers and auditors expect a named authorised signatory with position and date; an unsigned certificate is treated as a draft.
How long should a certificate of analysis be kept?
Keep it at least as long as the product's shelf life plus the retention period your customers and regulators expect — many industrial buyers ask for several years of batch traceability.
Can one COA cover several batches?
No. The point of the document is batch-level traceability. Issue one certificate per batch or lot, even when several batches ship together.
What if a result fails the specification?
Do not issue a conforming certificate. Either withhold the batch or issue the certificate with the actual result and a clear non-conformance statement, plus any concession agreed in writing with the buyer.