Spec sheets and certificates of analysis (COA) tell you exactly what you are buying and whether each batch meets standard. Learning to read them turns quality control from guesswork into a checklist.

Key takeaways

  • The spec sheet defines target appearance, pH and limits.
  • The COA reports the actual batch results against that spec.
  • Match COA values to spec on every delivery.

The product specification

A spec sheet lists the expected appearance, colour, odour, pH range, viscosity and microbial limits for the product. It is the agreed definition of what 'correct' looks like.

The certificate of analysis

A COA records the measured results for a specific batch - pH, micro tests, fill weight - and should fall within the spec ranges. It is your proof the batch was tested and conforms.

Use them for incoming QC

On each delivery, compare the COA to the spec and your retained sample. If a value is out of range, raise it before you accept and sell the batch.

Guidance compiled by the OEMHallmark research desk. Always verify current certifications, MOQs and terms directly with each manufacturer.