Use Grade Documents for the Right Decision
A safety sheet, a technical sheet and a batch analysis answer different questions. Keep each one linked to the exact material you are considering, then use the relevant measurements and your own application evaluation to complete the decision.
SDS
Identity, hazards and handling information for the named material.
TDS
Technical characteristics, methods and grade information.
COA
Reported analysis associated with an identified batch.
Application record
Your test conditions, results and acceptance for the actual use.
Three Documents with Different Jobs
Keep Chemical Identity with the Sample
For calcium carbonate, the listed CaCO3 identity and CAS 471-34-1 help identify the material family; the model and particle or treatment specification identify the grade. For salts, retain the actual hydration form or composition. Keep those details consistent across the enquiry, sample label and document set.
Particle Numbers Keep Their Measurement Basis
Separate Typical Values, Limits and Results
Typical value
A descriptive value for a grade. It is not automatically an acceptance limit or a result for your batch.
Specification limit
The agreed requirement against which the proposed material will be reviewed.
Batch result
A reported measurement tied to the stated batch and test basis.
Your decision
A recorded comparison with the accepted limits and the relevant application results.
Assay and Appearance Describe Different Properties
The 0.7 μm precipitated barium-sulfate entry lists purity ≥98.5% and whiteness 98.5%. The similar numbers describe different properties. Keep the assay analysis separate from the optical test and retain the method for each. The same distinction applies when comparing carbonate or titanium-dioxide powders.
Powder Tests and Finished-Material Tests Work Together
Oil absorption
Use a stated method when comparing pigment liquid demand; methods with different endpoints can give different results.
Gloss
Compare the finished panels with the same measurement geometry and film conditions.
Particle distribution
Use it to characterise the powder on its reported measurement basis.
Application acceptance
Use the relevant formulation or process results to decide whether that powder meets the project.
PAC Content and Basicity Stay Separate
Some PAC entries show 28% and 30% Al2O3 designations. An alumina percentage displayed under a basicity field does not provide a measured basicity result. Confirm the actual offered alumina content, a separate basicity value and the preparation method behind a product-pH result before comparing grades.
Continue to the industrial PAC selection guide
The Evidence Follows the Proposed Grade
Enquiry and proposal
Product link, exact model and the specification needed by the application.
Sample review
Sample identity, linked documents and the agreed evaluation record.
Order review
Accepted grade, required batch documents and any deviations to resolve.
Request Documents for a Defined Material
Send the product link or model, the intended application and destination, plus the measurements or qualification points your team needs. We can then discuss the relevant document set for the proposed material and identify the information still needed for your review.
