At a glance
- A TDS is primarily a grade-level technical reference, not a batch certificate.
- A COA is tied to a specific lot or shipment and should be checked against the agreed purchasing specification.
- An SDS communicates safety and hazard information in a standardized section structure.
- Test method, specimen condition and units are essential when comparing technical values between suppliers.
What to verify when reviewing How to Read PA6 TDS, COA & SDS
- 01A TDS is primarily a grade-level technical reference
not a batch certificate
- 02A COA is tied to a specific lot or shipment and should be checked
against the agreed purchasing specification
- 03An SDS communicates safety and hazard information in a standardized
section structure
- 04Test method, specimen condition and units are essential when comparing
technical values between suppliers
Technical Data Sheet (TDS): the grade-level reference
A technical data sheet normally summarizes typical physical, mechanical, thermal, electrical or processing information for a commercial grade. It helps engineers understand the material family and compare candidate products.
TDS values are often typical rather than guaranteed shipment limits. Always read the test method, unit, specimen condition and any dry-versus-conditioned notation. Two suppliers may report similar property names under different standards or conditioning procedures, making a direct numerical comparison misleading.
Certificate of Analysis (COA): the lot-level document
A certificate of analysis is associated with a specific production lot, batch or shipment. It normally reports selected measured values, pass/fail information or conformity to agreed release limits for that material.
The COA should be matched to the lot number on the packaging and shipping documents. Buyers should also confirm which properties are controlled on every lot, which are periodic tests and which requirements are governed by a separate customer specification or contract.
Documents worth aligning before a first order
- Current TDS or reference specification
- COA items that must be reported
- SDS language / market requirement
- Customer-specific declarations
- Any test method that must match the incumbent material
Safety Data Sheet (SDS): hazard and handling information
A safety data sheet is not a technical-performance sheet. Under the U.S. Hazard Communication framework, SDS information is organized into a standardized 16-section format covering identification, hazards, composition, first aid, fire response, accidental release, handling and storage, exposure controls, physical and chemical properties, stability, toxicology and other information.
For polymer materials, the SDS should be reviewed for the exact grade or product family supplied, particularly when additives, colorants, flame-retardant systems or other ingredients may affect the safety classification or handling information.
A practical document-review sequence
Use the TDS to decide whether a grade is technically worth evaluating. Use the agreed product specification and COA to confirm the material delivered is the correct lot and meets the applicable release requirements. Use the SDS for workplace safety, storage, handling and hazard communication.
For regulated or customer-qualified projects, additional documentation may be required, such as regulatory declarations, food-contact statements, RoHS/REACH-related declarations, UL recognition or customer-specific compliance records. Those documents should be requested explicitly rather than assumed from a TDS or SDS.
- TDS: typical grade properties and processing reference
- Specification: agreed acceptance limits
- COA: selected lot-specific results or conformity
- SDS: safety, hazard and handling information
- Additional declarations: application- or market-specific compliance
Applied support
STRANTOP documentation coordination
For international inquiries, STRANTOP helps collect and align the available grade documentation with the customer's qualification checklist. If a requirement is grade- or market-specific, we prefer to confirm it before the trial order rather than discover the gap after material is already in transit.
Discuss your material requirement →Questions we hear from buyers and processors
Is a TDS a guarantee that every lot has exactly those values?
Usually not. Many TDS values are typical; guaranteed limits should be identified in the applicable specification or supply agreement.
Should the COA lot number match the packaging?
Yes. The lot or batch identification should allow the COA to be linked to the material received.
Can an SDS replace a TDS?
No. An SDS addresses hazard and handling information, while a TDS addresses technical material properties and processing guidance.
Technical review
This resource is maintained by STRANTOP's technical and commercial team with input from affiliated PA6 polymerization and engineering-plastics resources. It is intended to help customers frame a material discussion; grade-specific specifications, processing conditions, compliance claims and final suitability remain subject to the applicable supplier documentation and customer validation.