Documentation / Updated 23 September 2026
COA, TDS and SDS in a material sourcing review
COA, TDS and SDS serve different purposes. A COA reports selected results for a batch or lot, a TDS describes technical information for a grade, and an SDS covers hazards and handling. Each should be reviewed for its intended use.
01
COA: information about a specific batch or lot
A Certificate of Analysis commonly reports selected test results for a particular batch or lot against stated limits. The useful parameters depend on the material, grade and agreed specification.
- Confirm material and batch identity
- Compare reported results with agreed limits
- Check test units and methods where relevant
- Route exceptions through the buyer's quality process
02
TDS: technical reference for a grade
A Technical Data Sheet generally describes a product grade, typical properties, suggested uses or processing guidance. Typical values are not automatically release specifications and should not be treated as a guarantee for every batch.
- Use for initial grade comparison
- Identify technical questions and processing constraints
- Confirm which values are typical and which are specifications
- Validate suitability in the intended process
03
SDS: hazards, handling and emergency information
A Safety Data Sheet supports hazard communication, storage, handling, exposure and emergency-response planning. It belongs in an EHS review and does not replace a technical or quality assessment.
- Confirm the correct material and supplier
- Review classification and handling controls
- Align storage and transport requirements
- Use the buyer's own EHS and legal review process
Use each document for its purpose
- 01COA supports batch or lot review.
- 02TDS supports grade and process discussion.
- 03SDS supports hazard and handling review.
- 04No single document replaces internal technical, quality, legal or EHS approval.
Document review questions
01Is a TDS the same as a product specification?+
Not necessarily. A TDS may include typical values or guidance. Confirm the agreed specification and release criteria separately.
02Can documents be requested before placing an order?+
Available documents can be coordinated during source review. State the exact document set and version requirements in the enquiry.
This article provides general information for a sourcing review. Material selection and use remain subject to the buyer's technical, quality, legal and EHS evaluation.
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