COA vs SDS: The Two Documents Every Chemical Buyer Should Check
What each one tells you, and what to look for before you accept a batch
Every consignment we supply travels with two documents from the manufacturer: a Certificate of Analysis (COA) and a Safety Data Sheet (SDS). They are often filed together, but they answer very different questions.
The Certificate of Analysis: is this batch right?
A COA is issued for a specific batch or lot. It lists the parameters tested, the specification limit for each, and the result actually found. It is your evidence that the material in your store matches what you ordered.
What to check on a COA
- Batch / lot number matches the number printed on the bags or drums
- Product name and grade match your purchase order
- Every result is inside its limit, especially the parameters your process depends on
- Manufacturing and expiry (or retest) dates leave enough shelf life for your usage
- The document is signed or stamped by the manufacturer's quality team
The Safety Data Sheet: how do we handle it?
An SDS is about the product, not the batch. In the GHS format it has 16 sections covering hazards, first aid, fire-fighting, spill response, storage, exposure limits, transport and disposal.
The sections your team will use most
- Section 2: hazard classification, pictograms and signal word
- Section 4: first-aid measures, for your safety officer and medical room
- Section 7: handling and storage conditions, including incompatible materials
- Section 8: exposure limits and the protective equipment required
- Section 14: transport information such as UN number and hazard class
Side by side
| COA | SDS | |
|---|---|---|
| Answers | Does this batch meet spec? | How do we use it safely? |
| Specific to | One batch or lot | The product and grade |
| Used by | QC, purchase, production | EHS, stores, logistics, production |
| Changes | With every batch | When the product or regulations change |
Need a document before you order?
You can request a sample COA or the SDS for any product in our range from the COA / SDS request page. We send the manufacturer's document, so you are reading exactly what will arrive with your material.
