TDS, SDS and COA for Mold Release Agents: Which Documents to Request and What to Check

TDS, SDS and COA for Mold Release Agents: Which Documents to Request and What to Check

Buyers routinely ask for "the certificates" and then receive a folder that does not answer the questions their quality team will ask. This guide explains what each document is, what belongs in it, who is responsible for its accuracy, and the specific checks that turn a document from a formality into something you can rely on.

The Three Documents, and What Each One Is For

The distinction that causes the most confusion: the TDS is a description of what the product should be, the COA is a record of what this batch actually was, and the SDS is about what happens if it goes wrong. A supplier who sends only a TDS is telling you about the product in general. A supplier who sends a TDS and a COA is telling you about the product and about the specific drum in your order.

What to Check in Each Document

TDS - Six Things

1. Does the pH match what you will be diluting to? A TDS pH of 9 for the concentrate, diluted 1:20, is not a pH 9 working solution. This is a common misunderstanding and it matters for both application and handling.

2. Is the dilution range stated? If it is not, you will end up asking the supplier every time. A TDS with no dilution range is incomplete for practical use.

3. Is the application method stated - spray, wipe, dip, or internal dosing? A grade that is only valid for one of these is not interchangeable with one that is not.

4. Are the working temperature conditions stated? Mould temperature range, or at least the intended process.

5. Is the storage range and shelf life stated? Without these you cannot plan your stock.

6. Does the physical form match what you will receive - liquid, concentrate or ready-to-use? This is the detail most often left ambiguous and the one that causes a customer to decant a whole drum into a tank on arrival.

SDS - Four Things

1. Is it in the format your jurisdiction accepts? GHS-based SDS is the global standard, but some jurisdictions require regional formats (for example, a 16-section format for the EU under REACH). Ask for the format your authority expects.

2. Is the company identification complete - name, address, and an emergency contact that actually works. An SDS with a placeholder emergency number is a document that has not been reviewed.

3. Are the handling and storage sections specific? Section 7 should state temperature range, whether freezing must be avoided, and whether the product needs protecting from light. Section 10 should give stability data.

4. Is the disposal section addressed - section 13? For an aqueous product this is usually simple, and the answer should be specific rather than a general statement.

COA - Three Things

1. Does it reference a specific batch number that appears on the drums you received? This is the link that makes a quality question answerable.

2. Does it list measured values with the test method or a specification range? "pH 8.4" is more useful than "conforms" - because it tells you whether the batch is centred or at the edge of tolerance.

3. Does it include a production or manufacture date and a retest date? The retest date tells you when the data expires, and a batch that is already past it when it arrives is worth querying.

Test Reports - A Separate Category

Compliance test reports are not the same as the three documents above, and they are the ones that get confused most often. Typical ones for this product category:

Two things to verify on any test report. First, the product name and grade on the report must match the product you are buying - a report for a different grade or a different formulation is worthless, and a mismatch in the header is the most common defect. Second, the issue date and the tested sample should be consistent with what you are buying now.

And one honest limitation: a chemical test report is not a statement that the finished part complies. Migration testing belongs on the moulded article, in a qualified laboratory, and it cannot be replaced by paperwork about the chemical. Where your application needs it, plan for that lead time.

Red Flags in a Document Folder

1. A certificate that only states a product name and nothing else - no composition, no reference, no limits. It certifies nothing.

2. A header company name that does not match the TDS and the invoice. Check this every time, including on your second order.

3. Wording like "FDA approved" for a process chemical. There is no such approval. A document that uses it was issued by someone who does not work in this field.

4. A report dated years earlier for a formulation that has since changed. Ask for the date and for confirmation the product has not been reformulated since.

5. A TDS with no dilution range and no storage conditions - it has not been written for use.

6. A COA with no batch number, or a batch number that does not match the drum.

How to Organise This So It Is Ready When Audited

The cost of chasing a document when a customer's auditor asks is far higher than the cost of keeping a folder. A workable arrangement:

• One folder per grade, containing the current TDS, SDS, latest COA and all test reports.

• A per-shipment subfolder with that batch's COA, the invoice and the packing list.

• Retained samples of each batch, labelled with the batch number, held for the period your customer requires.

• A register - grade, batch, date received, quantity, and where the retained sample is. A simple spreadsheet is enough.

• Re-issue trigger: a supplier who changes formulation, raw material source or packaging should tell you in advance. Put that in your purchase agreement.

How LONGWEI Provides Documentation

LONGWEI supplies TDS, SDS and a COA with every order, with batch-controlled pH and density per batch, plus SGS-issued RoHS and REACH reports with traceable report numbers. The company name on the documentation is SHENZHEN LONGWEI CLEANER CO., LTD - consistent with our business licence, our SGS reports and our invoices. Where a specific regulation applies to a grade, we will state which regulation the document relates to rather than using general wording, and we will tell you plainly where a chemical document ends and a migration test on your finished part is still required.

Ask us for the document set for any grade, and we will send it with the quotation.

Contact LONGWEI for a free sample and technical consultation. Tell us your process, material and mould temperature, and our engineers will recommend a matched grade.