How to Read a Steel Shot COA, TDS and SDS Before You Buy

Many procurement teams get a stack of technical documents with a harsh quote. Then they skim them or file them without a close review. A steel shot COA, a TDS and an SDS answer different questions. Simply receiving these documents does not mean they match your application or purchase requirements.

In real-world blast-cleaning operations, a certificate of analysis that looks acceptable at first glance may still leave out information your production team needs. Knowing what each document covers helps buyers spot gaps, avoid mismatched batches and reduce unexpected problems after the abrasive arrives on site. If you are still comparing media, this guide to steel shot and steel grit explains the practical differences to consider before finalizing product requirements.

What COA, TDS and SDS Documents Tell Steel Abrasive Buyers

Before looking at individual test figures, clarify the purpose of COA, TDS and SDS. Buyers sometimes mix up the three documents and request the wrong paperwork during supplier enquiries.

COA (Certificate of Analysis)

A COA reports inspection or test information for a product lot. Ask the supplier to identify the lot and confirm which properties were tested, the methods used, and whether results are specific to that lot or reported against an agreed product specification. The exact content should be stated in the purchase requirements; do not assume that every certificate contains the same tests.

TDS (Technical Data Sheet)

A technical data sheet describes a product family. It may list typical characteristics, size designations, hardness ranges, applications and handling guidance. It is useful during quotation and product selection, but typical TDS data does not by itself verify the properties of a particular shipment.

SDS (Safety Data Sheet)

An SDS focuses on the product's hazards and safe use. Review the product identifier, hazard information, composition where disclosed, first aid, handling and storage, exposure controls and personal protection, and other sections relevant to your site. Use the SDS for the exact product and follow the safety rules that apply at the destination. It is not a blasting-performance test report.

Key Fields to Review on a Steel Shot or Steel Grit COA

Not all COAs provide the same level of detail. A document that only says "product passed inspection" may not give your quality team enough information to verify the shipment. Before ordering, agree with the supplier which lot data and test methods will be reported.

Lot or batch identification

The batch number should appear on the COA and be traceable to the bag or bulk-container labels. Cross-check the identifiers when the goods arrive. Without a matching lot reference, it is difficult to show that the certificate applies to the material delivered.

Chemical composition

If chemistry is part of the purchase specification, check the reported elements and acceptance limits agreed for the product. For high-carbon cast steel shot and grit, buyers may specify carbon, manganese, silicon, sulphur and phosphorus. Compare reported values with the agreed limits rather than treating generic TDS figures as lot results.

Particle size and sieve analysis

Do not check only the nominal size name, such as G40 or S330. Where sieve distribution is specified, review the fractions retained on each sieve, including oversize and fine particles. The permitted distribution and test basis should come from the agreed product requirement.

Hardness results

Check the reported hardness range or readings, scale, test method and sampling basis against the purchase specification. For additional context, see how steel shot hardness relates to cleaning rate and abrasive life. GP, GL or GH labels alone do not show the measured result or establish that the lot meets your agreed range; for steel grit, review what these

GP, GL and GH grades mean for buyers and confirm the supplier's actual numerical limits.

Test method reference

The COA or supporting document should identify the test procedure where one is required by the order. SAE references may apply to size or other product requirements, depending on the abrasive and application. Agree the standard and revision, if required, before purchase; a standard name alone is not proof of certification.

What Information to Expect From a Steel Abrasive TDS

While the COA is tied to inspection or testing of a lot, the TDS is a general product reference. Use it to confirm that the product description and stated characteristics fit the application you are evaluating.

Check for the product type, size-designation system, stated hardness range, typical chemical composition if provided, particle-shape description, application guidance and any stated limitations. The details vary by supplier and product. If a value matters to acceptance, put it in the purchase specification and verify how it will be tested and reported.

Use the TDS during the quotation stage to compare product information. For an incoming shipment, use the COA and the agreed receiving checks. Do not treat typical TDS values as measured results for a delivered batch.

How to Review an Abrasive SDS for Site Safety

An SDS does not tell you how quickly an abrasive will clean. It gives your safety and operations teams information to review before storage and use.

Check the product identity and hazard classification first. Then review relevant sections for composition, first aid, accidental release, handling and storage, exposure controls and personal protective equipment. Consider the dust-control and housekeeping procedures at your site, and confirm the document is the current version for the product being supplied.

SDS format and regulatory obligations depend on the destination and applicable rules. Do not assume a hazard or PPE requirement based only on the material name; follow the product-specific SDS and local workplace requirements.

How to Spot COA, TDS and Packing-Label Discrepancies

Even when the documents appear complete, compare them with the physical goods and purchase order. Train receiving and quality teams to look for issues such as:

• The COA batch number does not match the number on bag or bulk-container labels.
• A reported hardness value falls outside the agreed range, although the grade label appears correct.
• Sieve results show more fines or oversize particles than the purchase specification allows.
• A COA states only "pass" when the order requires numerical results.
• A generic TDS is presented as evidence of lot-specific testing.
• The product name or size designation differs between the purchase order, COA and packaging.

If you find a mismatch, raise it with the supplier before unloading or putting the material into production. It is harder to resolve a documentation issue after the abrasive has entered the circulating working mix.

A Practical COA, TDS and SDS Review Workflow

Use a repeatable document check at each stage of the order:

Common Mistakes When Reviewing Abrasive Documents

• Accepting a grade label such as GP, GL or GH without checking the agreed numerical hardness requirement and test basis.
• Confusing typical TDS values with lot-specific COA results.
• Accepting a pass/fail-only COA when the purchase agreement calls for numerical measurements.
• Failing to match the COA lot ID to physical package labels.
• Filing an SDS without checking the product identity, revision or site-relevant safety sections.
• Writing a purchase order with only a size name such as G40 and no agreed test or acceptance requirements.

These errors can look minor during ordering. They become harder to resolve when production sees surface-profile variation, unexpected abrasive breakdown or a shipment that cannot be traced to its test records.

What Buyers Should Confirm Before Bulk Delivery

COA, TDS and SDS documents serve different purposes. The TDS describes general product characteristics. The COA records inspection or test evidence for a lot as agreed. The SDS provides product-specific safety information.

Before approving a bulk delivery, confirm lot traceability, the agreed hardness and size data, any required chemistry or test results, and consistency between the COA and packaging labels. Keep the SDS available to the people responsible for receiving, storage and safe use.

If you are unsure which values or documents to include in your purchase specification, share your application and requirements with our team. We can help you identify the document checks to discuss with the supplier before ordering.