Supplier changed a raw material: which customers are affected?

What do you need before tracing a supplier raw material change?

Before tracing a supplier raw material change, you need the supplier's change notice, both safety data sheets for the raw material (the last one before the change and the new one), and access to your batch, shipment and customer records. Ask the supplier for what the notice leaves out: what exactly changed (composition, source, site or process), the first lot made after the change, and whether the specification and certificate of analysis items stay the same.

Pull your own records next. List every internal material code that points to this raw material, including codes for alternate packaging or a second approved source. Collect batch records or production logs that show which raw material lots went into which product batches, and shipment records that show which batches went to which customers. Note where each record set starts and ends.

If your site is certified to ISO 9001, check which edition your certificate covers: ISO 9001:2026 was published on 16 September 2026 and replaced ISO 9001:2015 (ISO, 2026). Run the trace under that certificate's change-control procedure and keep the check table below as the change record.

Where should you start the trace when a supplier changes a raw material?

The trace for a supplier raw material change should start at the first changed lot of that raw material received at your site, not at the notice date and not at the product you suspect. A notice often arrives after changed lots have shipped, and a trace that starts at the notice date misses everything produced in between.

Write the trace start down in one line: raw material name and internal code, the supplier, what changed, the first changed lot number and the date you received it. If the supplier cannot name the first changed lot, start at the earliest date the change could have reached you and say so in the record. A trace start that is uncertain widens the list; it does not shrink it.

Then fix the question you are answering for each product: does the change reach a property, a document or an approval this customer relies on? Properties come from your product specification, documents from the safety data sheet and technical data sheet, and approvals from customer specifications or qualification records. A trace without that question sorts customers by guess.

How do you set the list of products and customers to check?

The list of products and customers to check after a raw material change is every product made with any changed lot and every customer who received those products, counted and written down before anyone starts sorting. That count is your denominator. Without it, a report that says "no impact found" cannot tell the reader how much was actually checked.

Trace forward from each changed raw material lot to product batches, then to shipments and customers. Include intermediates, rework, samples, private-label and toll-blended products, because they are the batches most often missing from a first list. Add products that use the raw material but have not yet been made with a changed lot; they are affected for future supply even if no customer holds one today.

A safety data sheet change can widen the customer list. If the change brings new hazard information, an EU supplier must send the revised safety data sheet to all former recipients supplied in the preceding 12 months (REACH Article 31 paragraph 9, consolidated 2026), which can include customers who never received a changed lot. Record every gap where batch or shipment records end, and put the customers behind that gap on the list as unconfirmed.

How do you sort customers into affected, no confirmed impact and unconfirmed?

Customers reached by a raw material change sort into three classes by the evidence checked: affected when the change reaches a property, document or approval they rely on; no confirmed impact when checked evidence shows it does not; unconfirmed when nothing has been checked. The table below decides which class each product or customer goes into and what happens next; the rows are illustrative.

The rule that decides most disputes is the last row: a product or customer nobody has checked stays unconfirmed, never unaffected. Closing the trace with unchecked items counted as unaffected turns a gap in your records into a claim about your customers.

Each row needs its evidence named in the record, so a reviewer can see why a customer sits in its class. A customer moves from unconfirmed to no confirmed impact only when a named document, such as a supplier statement or a certificate of analysis for the changed lots, shows the change does not reach what that customer relies on. Report the three counts against the denominator, for example 40 customers listed, 12 affected, 20 no confirmed impact and 8 unconfirmed (illustrative).

How do you check a raw material change against SDS composition when you have no formulation records?

Without formulation records, you check a raw material change against safety data sheet composition by comparing section 3 of the supplier's old and new sheets, then finding your products whose own sheets list the same constituents. Look for added or removed substances, changed CAS numbers, changed concentration ranges and changed classifications, then read section 2 for a new hazard class and section 9 for changed properties.

Know what section 3 cannot show. For a mixture, the EU sheet must list at least the substances that meet the classification or other listing criteria, and suppliers "may choose to list in addition all substances in the mixture, including substances not meeting the criteria for classification" (Regulation (EU) 2020/878, Annex II, 3.2). The US sheet lists ingredients classified as health hazards above their cut-off or concentration limits, or that present a health risk below them, and allows identities or concentrations to be withheld as trade secrets (OSHA 29 CFR 1910.1200 Appendix D, 2026).

A change to a non-classified constituent can therefore leave section 3 unchanged. Use product use records to find which customers use the affected products and for what, and keep every product where section 3 is silent as unconfirmed until the supplier confirms the change in writing.

Which affected customers should you contact first after a raw material change?

Contact first the affected customers whose product classification or safety data sheet changes, then those whose approval or specification names the raw material, then those holding changed lots in critical use. The order follows deadlines and the cost of being wrong.

1. Classification and safety data sheet changes. In the EU, a change to a hazardous mixture that moves the concentration of a hazardous constituent by more than the variation Annex I Table 1.2 permits, or substitutes or adds constituents at or above the cut-off value, requires a new classification evaluation (CLP Article 15(2), 2008). The revised sheet then goes to recipients supplied in the preceding 12 months (REACH Article 31 paragraph 9, consolidated 2026). In the US, new significant hazard information goes on the sheet within three months and the update ships with the first shipment after it (OSHA 29 CFR 1910.1200(g)(5) and (g)(6), 2026).

2. Customers whose specification, approval or contract names the raw material, its source or a change-notice duty.

3. Customers holding changed lots in uses where a property change stops a line or fails a part.

4. Unconfirmed customers with the largest volume of changed lots.

Customers with no confirmed impact get a record entry, not a call, unless their contract asks for notice of any change.

Common mistakes when tracing a raw material change

The most common mistake when tracing a raw material change is counting customers nobody checked as unaffected, which turns missing records into a statement about the customer. The others come from starting the trace too narrowly.

• Starting at the notice date instead of the first changed lot received, which misses batches made in between.

• Tracing one internal material code when the raw material sits under several codes or a second approved source.

• Leaving out rework, intermediates, samples and toll-blended batches.

• Checking only the largest customers and reporting the result as if it covered all of them.

• Treating an unchanged safety data sheet section 3 as proof that nothing changed, when non-classified constituents need not appear there (Regulation (EU) 2020/878, Annex II, 3.2).

• Closing the trace without writing down the denominator, so nobody can later tell how many products and customers were checked.

• Sending a revised safety data sheet only to customers who received changed lots, when a hazard update goes to all recipients supplied in the preceding 12 months (REACH Article 31 paragraph 9, consolidated 2026).

When should you call a specialist about a supplier raw material change?

Call a specialist about a supplier raw material change when the safety data sheet comparison suggests a new classification, when the raw material carries a function a product depends on, or when a customer approval may need requalification. Classification under CLP Article 15 needs someone who can evaluate each mixture, and a change in an emulsifier, inhibitor or curing agent can move performance that no safety data sheet records.

Bring in the supplier's technical team when it will not state what changed or name the first changed lot; ask for a written statement, and keep the products it covers as unconfirmed until it arrives. Bring in your own formulation chemist when two or more products depend on the changed raw material for the same property; one bench test may settle several.

Lubinpla scopes this kind of change from the records it holds: it pulls the products and customers a change reaches, sorts them into affected, no confirmed impact and unconfirmed, keeps anything it could not query as unconfirmed, and uses safety data sheet composition and product use records because it holds no lot, shipment or formulation data.