TDS, MSDS (or SDS) and COA get requested interchangeably by buyers, but they're three different documents answering three different questions. Knowing which one you actually need saves a round of back-and-forth with your supplier.
Technical Data Sheet (TDS)
A TDS describes the product's typical, general properties as manufactured — not one specific batch. It's what a process engineer reaches for when designing or evaluating a process: typical assay range, physical form, solubility, density, and similar reference data. Because it's typical rather than batch-specific, a TDS is not proof that a given shipment meets specification.
Safety Data Sheet (SDS / MSDS)
An SDS (still commonly called MSDS) is the standardised, typically 16-section hazard and handling document — covering hazard classification, first aid, firefighting measures, handling and storage, PPE requirements, and transport information. This is the document your safety officer, transporter and often your customs paperwork will ask for, and it applies to the product generally rather than to one shipment.
Certificate of Analysis (COA) / Test Report
A COA is batch-specific: it's the actual lab result for the specific lot you're being shipped, tested against agreed specifications. This is what confirms the material in front of you meets the purchase order — see our companion guide on how to read a Certificate of Analysis for how to interpret one. It's also the document format we use for every downloadable Test Report on our own product pages.
Which One Do You Actually Need?
- Designing or evaluating a process — start with the TDS.
- Safety approvals, transport, customs paperwork — you'll need the SDS/MSDS.
- Confirming a specific shipment meets your PO before it goes into production — you need the COA / test report for that batch.
We can supply all three for the products we stock — see our TDS / SDS request page or get in touch directly.