Specification: the agreed quality target
The specification is the commercial quality framework for the grade. It lists tests, limits and sometimes methods. It should make the identity and concentration basis unambiguous.
Check whether key values are reported on an anhydrous, as-is, solution or carrier basis. A limit without a clear basis can create incorrect formulation and purchasing decisions.
- Identity test
- Assay or active content
- Appearance
- Water or loss on drying
- Microbiological or impurity limits where relevant
COA: the result for one lot
The Certificate of Analysis reports the measured result or conformity status for a named batch. It should identify the lot and connect to the same tests used in the agreed specification.
A generic sample COA is useful for screening but does not describe the lot that will ship. Confirm when the final batch COA becomes available and whether retesting or release status is indicated.
TDS: the technical operating context
The Technical Data Sheet normally explains the product, physical form, typical properties, suggested applications, processing guidance and storage. It supports formulation planning but is not a batch-release document.
Because commercial forms change, always check the TDS revision date and product code. Internet guidance for a different supplier grade should not override the current document.
SDS: safe handling and hazard communication
The Safety Data Sheet addresses classification, handling, storage, exposure control, transport and disposal. It is not an efficacy dossier and should not be used to infer cosmetic performance.
Make sure the SDS matches the country or region where the material will be handled and the exact product or mixture being purchased.
A practical approval sequence
Use the specification and TDS to screen the grade, the SDS to plan safe handling, and the COA to verify the released lot. Record document versions in the raw-material approval file so later changes can be traced.
- Screen identity and grade
- Review handling and storage
- Run laboratory evaluation
- Approve specification and supplier
- Verify each commercial lot