How to Read TDS, SDS and Certification Documents
Technical data sheets, safety data sheets and batch certificates of analysis serve different purposes. Learn what each document tells you during purchasing and quality control.
A product’s technical suitability cannot be assessed from the short statements on its packaging alone. A TDS gives the target technical properties, an SDS provides safe-use and emergency information, and a CoA reports test results for a particular production batch. Depending on their scope, certificates provide different evidence about quality management systems, analysis or conformity.
- A TDS summarizes product specifications; it is not a safety document.
- An SDS communicates hazards and safe handling; it does not guarantee performance.
- A CoA shows the analytical results for a specific batch.
- An ISO certificate alone does not prove every technical value of every product batch.
The difference between a TDS, SDS, CoA and certificate
| Document | Main purpose | How is it used in purchasing? |
|---|---|---|
| TDS — Technical Data Sheet | Defines typical or specified technical properties of the product | To compare criteria such as purity, physical form, particles, oil content and packaging |
| SDS — Safety Data Sheet | Communicates hazard, handling, storage, exposure and emergency information | To prepare occupational safety, storage, logistics and emergency plans |
| CoA — Certificate of Analysis | Reports measured analytical results for a particular production batch | To verify that incoming material meets the order specification |
| Management system certificate | Shows the scope of an independent assessment of a particular system | To verify the certificate number, scope, facility and validity dates |
How to read a TDS
First, make sure the product name and variant match the quotation or order. Then look for three elements together in each line: value or limit, unit and test method. Unmeasurable descriptions such as “fine,” “high purity” or “standard quality” are not sufficient for a technical comparison.
- Chemical composition: elemental sulfur, ash, moisture, acidity or relevant components
- Physical properties: powder, granular, liquid or oil-treated form
- Fineness: mesh standard, percentage passing a sieve or particle size distribution
- Industrial variant: process oil type / content and the relevant test method
- Packaging: net weight, inner liner, pallet configuration or special packaging option
- Revision: the document’s issue / revision date
Why do the 16 sections of an SDS matter?
Under OSHA’s hazard communication framework, an SDS follows a standard 16-section structure. Information about first aid, firefighting, accidental release, handling and storage, exposure controls and personal protective equipment appears in separate sections. A company’s purchasing team should look beyond the first page, paying particular attention to sections that affect its own storage and processing conditions.
- Identification
- Hazard identification
- Composition / information on ingredients
- First-aid measures
- Firefighting measures
- Accidental release measures
- Handling and storage
- Exposure controls / personal protection
- Physical and chemical properties
- Stability and reactivity
- Toxicological information
- Ecological information
- Disposal considerations
- Transport information
- Regulatory information
- Other information / revision
A common mistake when checking a CoA
A result marked simply “compliant” on a CoA is not sufficient. The batch number, production date, analysis date, method, unit and acceptance limits should match the order requirements. A typical value in a TDS is not necessarily a contractual limit. Critical properties should be clearly defined in the purchasing specification.
Document verification note: Check the organization name, facility address, scope, certificate number and validity dates. A logo on a certificate does not by itself prove that its scope covers the product ordered.
How can you request technical documents from Köseoğlu?
Submit a request through the Request a Quote page, specifying the full product name, application, required variant and document type. Documentation requirements may differ between agricultural and industrial products, so confirming the current revision before shipment is recommended.
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