How to Decide When a Safety Data Sheet Needs Revision

The method covers SDS revision duties of manufacturers, importers, formulators and distributors under US OSHA HCS and EU REACH and CLP. It does not cover transport documents, products that need no SDS, or SDS rules in China, Japan, Korea and other jurisdictions, which set their own triggers.

When should you use this safety data sheet revision method?

Use this safety data sheet revision method whenever a change could make a published SDS inaccurate: a formulation change, a revised raw material SDS, new toxicology data, a new exposure limit, or a change to classification rules. The method fits whoever owns SDS authoring at a manufacturer, importer, formulator or distributor that ships to the US, the EU or both.

Run it at three moments. First, at every change request for a formula, raw material source or process that alters composition. Second, when an upstream supplier sends a revised SDS, because a supplier's new classification of a constituent flows into your mixture classification. Third, at a fixed regulatory watch interval, because harmonised classifications and exposure limits change on published dates, not when your product changes.

Two features of the rules make a written decision method worth the effort. The US rule starts its clock when the SDS preparer becomes "newly aware" of significant information, so the date you learned something matters as much as the content (OSHA 29 CFR 1910.1200, 2024). The EU rule requires an update without delay and a resupply to past recipients, so a missed trigger repeats across a whole customer list (REACH Article 31, 2006). A recorded decision for each change, including a decision not to revise, shows an inspector that the trigger was assessed and when.

What do you need before deciding on a safety data sheet revision?

Before deciding on a safety data sheet revision, collect five inputs, so that each criterion can be tested against records rather than memory.

1. The current SDS for each market, with the classification method used for each hazard class (test data, bridging principles or calculation).

2. The formulation before and after the change, in weight percent per constituent, including classified impurities and additives.

3. The latest SDS from every raw material supplier, because a reclassified constituent can change your mixture without any change on your side.

4. A watch list of rule changes with their dates: OSHA compliance dates, EU harmonised classification updates, new CLP hazard classes, and new EU or national occupational exposure limits. For example, Directive 2024/869 required Member States to bring new EU limit values for lead and diisocyanates into force by 9 April 2026, with transitional diisocyanate values until 31 December 2028 (Directive 2024/869, 2024).

5. A shipment record by customer and date, because the EU resupply duty reaches back over the preceding 12 months (REACH Article 31, 2006).

Both rules expect you to look for new information, not wait for it to arrive. OSHA requires classifiers to "identify and consider the full range of available scientific literature and other evidence concerning the potential hazards" (OSHA 29 CFR 1910.1200, 2024). CLP Article 15(1) requires manufacturers, importers and downstream users to "take all reasonable steps available to them to make themselves aware of new scientific or technical information that may affect the classification" of what they place on the market (CLP Article 15, 2008).

What counts as new significant information under OSHA HCS?

Under the OSHA Hazard Communication Standard (HCS), new significant information is information about the hazards of a chemical, or about ways to protect against them, that the current SDS does not reflect; the standard uses the term without defining it. Paragraph (g)(5) reads: "If the chemical manufacturer, importer or employer preparing the safety data sheet becomes newly aware of any significant information regarding the hazards of a chemical, or ways to protect against the hazards, this new information shall be added to the safety data sheet within three months." (OSHA 29 CFR 1910.1200, 2024). The same paragraph requires the SDS to accurately reflect "the scientific evidence used in making the hazard classification".

Canada's Hazardous Products Regulations give a written definition that helps read the US term. There, significant new data are data that "change its classification in a category or subcategory of a hazard class, or result in its classification in another hazard class, or change the ways to protect against the hazard presented by the hazardous product" (Hazardous Products Regulations, 2015). That definition binds only Canadian suppliers.

A practical reading for the US, which is our inference and not OSHA text, treats information as significant when it does one of three things: changes a hazard class or category, changes hazard or precautionary statements, or changes protective measures such as exposure limits, engineering controls or personal protective equipment. Editorial corrections, such as a new telephone number, are likely outside the term but still need fixing.

How fast must a safety data sheet be revised in the US and in the EU?

A safety data sheet must be revised within three months of becoming aware of significant information in the US, and without delay in the EU; labels follow on separate clocks in both.

In the US, OSHA 29 CFR 1910.1200(g)(5) gives three months for the SDS, and paragraph (f)(11) gives six months for labels, with an option not to relabel containers already released for shipment if the updated label goes with each shipment (OSHA 29 CFR 1910.1200, 2024). If the chemical is not currently produced or imported, the information must be added before the chemical is introduced into the workplace again.

In the EU, REACH Article 31(9) requires suppliers to update the SDS without delay when new hazard information or information affecting risk management measures becomes available, when an authorisation is granted or refused, and when a restriction is imposed (REACH Article 31, 2006).

For EU labels, CLP Article 30 currently requires an update without undue delay where the new hazard is more severe, and within 18 months for other label changes (CLP Article 30, 2008). The revised Article 30, which counts its 6-month and 18-month deadlines from the new evaluation, now applies from 1 January 2028 after a deferral (Regulation 2024/2865, 2024; Regulation 2025/2439, 2025). A further CLP simplification regulation proposed in 2025 would change Article 30 again (COM(2025) 531, 2025); as of 13 October 2026 it was awaiting the European Parliament's first-reading vote, forecast for 19 October 2026, and had not been published in the Official Journal (European Parliament, 2026).

Canada allows sales for up to 90 days after significant new data if the buyer also receives a document listing the required SDS changes (Hazardous Products Regulations, 2015).

Does a change in composition within the stated range need a new safety data sheet?

A composition change inside the tolerance bands of CLP Annex I Table 1.2 does not by itself require a new classification evaluation in the EU, so, on our reading, the safety data sheet stands unless section 3 states a value the change makes wrong or the new concentration crosses a concentration limit used in the classification. CLP Article 15(2) requires a new evaluation of a hazardous mixture when the initial concentration of a hazardous constituent changes by at least the Table 1.2 limit, or when a constituent is substituted or added at or above its cut-off value (CLP Article 15, 2008).

The table below shows how far a constituent may vary before CLP Article 15(2)(a) requires a new evaluation.

Read as a change relative to the initial concentration, a constituent at 8% falls in the ±20% band and may move between 6.4% and 9.6% before a new evaluation is due (illustrative calculation). Inside the band, still check whether the new value crosses a generic or specific concentration limit for that constituent; if it does, the calculated classification changes and the SDS must follow it. CLP Article 15(3) also removes the duty where valid scientific justification shows the classification will not change.

The US has no equivalent table. Under OSHA, the test is whether the SDS is still accurate: Appendix D section 3 requires the exact percentage unless a trade secret is claimed, the mixture has batch-to-batch variability, or the SDS covers substantially similar mixtures, in which cases a range may be used (OSHA 1910.1200 Appendix D, 2024). A new value inside a stated range, such as the trade secret band from 7% to 13%, needs no section 3 change; an exact percentage must be corrected (OSHA 29 CFR 1910.1200, 2024).

Which cut-off value decides whether a new constituent needs a safety data sheet re-evaluation?

A constituent added to or substituted into a hazardous EU mixture triggers a new evaluation, and possibly a revised safety data sheet, when its concentration reaches the cut-off value CLP Annex I sets for its hazard class (CLP Article 15, 2008; CLP Annex I, 2008).

Table 1.1 sets a generic cut-off value of 0.1% for acute toxicity categories 1 to 3 and for aquatic acute 1 and chronic 1, and 1% for acute toxicity category 4, skin and eye effects, specific target organ toxicity single exposure category 3, aspiration and chronic aquatic 2 to 4; for other hazard classes, such as carcinogens and sensitisers, the cut-off is the generic concentration limit in Annex I Parts 3 to 5, and for those classes a specific concentration limit (SCL) replaces it where one is set (CLP Annex I, 2008).

Specific concentration limits are set either in Part 3 of Annex VI or in the classification and labelling inventory; for a hazard class listed in Table 1.1, the lower of the SCL and the generic cut-off value applies, so check both sources for each new constituent (CLP Annex I, 2008). For aquatic hazards, an M-factor set for a constituent adjusts the Table 1.1 cut-off value using the calculation in Annex I section 4.1 (CLP Annex I, 2008).

How do you apply the safety data sheet revision criteria step by step?

Apply the safety data sheet revision criteria in five steps, once for each market where the product is sold: log the change and its date, test it against every row of the criteria table, reclassify where a row is met, set the deadline, and record the decision.

1. Log the change, its source and the date you became aware of it, because the US clock runs from that date.

2. Test the change against each row of the table below.

3. Where a row is met, redo the classification with the method recorded on the current SDS and compare hazard classes, categories, statements and section 8 values.

4. Set the deadline: three months in the US, without delay in the EU, or the fixed date the rule names for regulatory changes.

5. Record a decision for every change, including no revision, with the reason and the row applied.

The table below decides whether a change triggers a revised SDS and by when.

The harmonised classification row is easy to miss: an EU adaptation applying from 1 May 2026 (Regulation 2024/2564, 2024) can change every mixture that contains a listed substance above its cut-off value, even when your own formula has not changed.

Worked example (illustrative): a formulation change and its safety data sheet

In this illustrative worked example, a formulator changes a floor coating sold in the US and the EU, and the safety data sheet revision method returns an EU re-evaluation and a US section 3 check.

The change has two parts (illustrative values). Constituent A, a classified skin sensitiser, rises from 8.0% to 9.5%. A new defoamer, classified aquatic chronic category 3, is added at 2.0%.

Step 1 logs the change request date. Step 2 tests the rows. For constituent A, the ±20% band for 2.5% to 10% allows 8.0% to move up to 9.6%, so 9.5% stays inside and Article 15(2)(a) does not apply (illustrative). For the defoamer, 2.0% is above the 1% generic cut-off for chronic aquatic categories 2 to 4 (CLP Annex I, 2008), so Article 15(2)(b) requires a new evaluation.

Step 3 reruns the aquatic classification. Under the summation method of CLP Annex I Table 4.1.2, a mixture is chronic 3 only when (M x 100 x chronic 1) + (10 x chronic 2) + chronic 3 reaches 25% (CLP Annex I, 2008), so 2.0% of a chronic 3 defoamer changes the result only if other aquatic constituents bring the sum to 25% (illustrative). If the class changes, sections 2 and 12 and the label change, and the EU SDS is revised without delay; if not, the evaluation is recorded and the SDS stands. The rule text does not settle whether a reformulated product still counts as a mixture placed on the market before 1 May 2026, so the cautious reading treats it as new and classifies it for the new hazard classes now (Regulation 2023/707, 2023).

In the US, section 3 lists constituent A under a trade secret claim as the prescribed range from 7% to 13%, so 9.5% needs no change (illustrative). OSHA does not enforce section 12 (OSHA 29 CFR 1910.1200, 2024), so the aquatic result changes the EU file only.

Who must receive the revised safety data sheet?

The revised safety data sheet must reach every EU customer supplied in the preceding 12 months, and every US distributor and employer with their first shipment after the update (REACH Article 31, 2006; OSHA 29 CFR 1910.1200, 2024).

In the EU, REACH Article 31(9) requires the new dated version, identified as "Revision: (date)", to be provided free of charge on paper or electronically to all former recipients supplied within the preceding 12 months (REACH Article 31, 2006). The duty is active: you send the update even if the customer places no new order. The SDS must also be in an official language of the Member State where the product is placed on the market, unless that Member State provides otherwise (REACH Article 31, 2006).

In the US, manufacturers and importers must provide the updated SDS to distributors and employers with the first shipment after the update, and distributors must pass it on to their own customers the same way (OSHA 29 CFR 1910.1200, 2024). On our reading, the US duty is tied to shipments, so a customer who buys nothing more receives no update under the rule; sending one anyway avoids a stale copy in the field. Employers then keep the current SDS readily accessible to employees during each work shift (OSHA 29 CFR 1910.1200, 2024).

Where a distributor re-issues the SDS under its own name, the update has to travel down every tier. A shipment report filtered by product and date gives the EU recipient list.

Where does this safety data sheet revision method not apply?

The safety data sheet revision method in this guide does not apply to products that need no SDS, to transport documents, or to jurisdictions outside the US and the EU, and it applies only in part to biocides and plant protection products.

Products that need no SDS fall outside it. REACH does not require an SDS for hazardous products sold to the general public with sufficient information for safe use, unless a downstream user or distributor requests one (REACH Article 31, 2006). OSHA exempts articles, as the standard defines them, from the HCS (OSHA 29 CFR 1910.1200, 2024), and REACH Article 31 places the SDS duty on suppliers of substances and mixtures (REACH Article 31, 2006).

Biocides and plant protection products follow their own legislation in addition to CLP; CLP Article 15(5) points to those regimes, so their label and SDS triggers need a separate check (CLP Article 15, 2008).

The US and the EU also differ in what they enforce. OSHA requires the headings of sections 12 to 15 but states that it will not enforce their content (OSHA 29 CFR 1910.1200, 2024), while the EU applies all 16 sections (Regulation 2020/878, 2020). An environmental reclassification can therefore force an EU revision and leave the US SDS unchanged.

Other jurisdictions, including China, Japan, Korea and Great Britain, have their own SDS legislation. Their triggers and deadlines are not covered here, and the US and EU deadlines above should not be assumed to apply there.

How should you record and send the revised safety data sheet?

Record each revised safety data sheet with a new revision date on the first page, the version it replaces, and a list of changes in section 16, then send it with a short cover note that names the changed sections.

REACH Annex II, as replaced by Regulation 2020/878, requires the revised SDS to show "Revision: (date)" on the first page together with an indication of which version is replaced, such as a version number, revision number or supersedes date (Regulation 2020/878, 2020). Section 16 must give "a clear indication of where changes have been made to the previous version of the safety data sheet", unless indicated elsewhere, and the supplier must be able to explain the changes on request (Regulation 2020/878, 2020). OSHA Appendix D requires section 16 to give "The date of preparation of the SDS or the last change to it" (OSHA 1910.1200 Appendix D, 2024).

Keep a decision file for each change with five fields: the trigger and its source, the awareness date, the criterion row applied, the result with reasons, and the send list with dates. That file answers an inspector who asks why an SDS dated before a rule change is still in circulation.

Lubinpla, an applied AI company for specialty chemical technical reasoning, works such a case from your own SDS, TDS and CoA files, sorts the conditions and evidence, and returns one cited document for your review, with your approval at each step.

Key takeaways

• Test every formulation, raw material and regulatory change against the same criteria, for each market, and record a decision even when the answer is no revision.

• The US clock is three months from awareness of significant information; the EU standard is without delay, with resupply to recipients of the preceding 12 months (OSHA 29 CFR 1910.1200, 2024; REACH Article 31, 2006).

• CLP Annex I Table 1.2 decides whether an EU composition change needs a new evaluation; the US asks only whether the SDS is still accurate.

• Fixed dates drive revisions in 2026 and 2027: new CLP hazard classes for new mixtures from 1 May 2026, and the OSHA mixtures deadline of 19 November 2027 (Regulation 2023/707, 2023; OSHA, 2026).