How the HCS 2024 re-label deadlines work
OSHA's 2024 update to the Hazard Communication Standard (29 CFR 1926.59 (adopts 29 CFR 1910.1200)) aligns U.S. labeling and safety data sheets primarily with GHS Revision 7. It does not switch on all at once. Instead, 29 CFR 1910.1200(j) phases compliance in by two variables: who you are (a manufacturer/importer/distributor who ships the product, versus an employer who uses it) and what the product is (a single substance or a mixture). A four-month extension finalized January 15, 2026 (FR Doc. 2026-00653 (Jan 15, 2026), +4 months) pushed every original date back; the dates below are the post-extension dates now in force.
HCS 2024 deadlines by role and product kind
| Who | Product | In-force deadline | CFR |
|---|---|---|---|
| Manufacturer / importer / distributor | Substance | May 19, 2026 | 29 CFR 1910.1200(j)(2)(i) |
| Employer (downstream user) | Substance | November 20, 2026 | 29 CFR 1910.1200(j)(2)(ii) |
| Manufacturer / importer / distributor | Mixture | November 19, 2027 | 29 CFR 1910.1200(j)(3)(i) |
| Employer (downstream user) | Mixture | May 19, 2028 | 29 CFR 1910.1200(j)(3)(ii) |
There is no separate distributor date — manufacturers, importers, and distributors share the (j)(2)(i) / (j)(3)(i) dates. Source: eCFR text of 29 CFR 1910.1200(j), as extended by FR Doc. 2026-00653 (Jan 15, 2026), +4 months. Verified 2026-06-23.
Two independent clocks: the sheet and the label are not the same rule
Two duties do not wait for the phase-in, and they are routinely merged into one wrong deadline. They differ in who is bound and in how long:
- 29 CFR 1910.1200(g)(5) — 3 months, the safety data sheet only. It binds the chemical manufacturer, importer or employer preparing the safety data sheet: “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.” An employer who merely receives sheets from suppliers is not on this clock — the supplier sends the revised sheet with the first shipment after the update (29 CFR 1910.1200(g)(6)(i)), with no month-based deadline.
- 29 CFR 1910.1200(f)(11)(i) — 6 months, labels, and this one does name the employer: “Chemical manufacturers, importers, distributors, or employers who become newly aware of any significant information regarding the hazards of a chemical shall revise the labels for the chemical within six months of becoming aware of the new information and shall ensure that labels on containers of hazardous chemicals shipped after that time contain the new information.” So when a revised SDS upgrades a hazard, your in-house workplace labels are on a 6-month clock — not the 3-month one.
Both apply now, regardless of which (j) deadline governs your re-classification. The planner above computes each due date from the date you received the information.
The new physical-hazard classes you must screen for
When you re-classify under HCS 2024, evaluate the finalized new and revised physical-hazard classes. These are real, finalized classes in Appendix B — not optional:
- Desensitized Explosives — 29 CFR 1910.1200 App B.17
- Chemicals Under Pressure — 29 CFR 1910.1200 App B.3.2
- Aerosols (Categories 1–3, incl. new Cat 3 non-flammable) — 29 CFR 1910.1200 App B.3
Appendix C fixes the SYMBOL SET at 8 — “one of eight standard hazard symbols shall be used in each pictogram” — and then allocates label elements per classified hazard class and category. So a label carries the pictogram(s) its classification calls for, which is rarely eight and is often one. The GHS09 environment symbol is outside OSHA jurisdiction and is not OSHA-required at all.
Worked examples
1) Employer using a single solvent, old (Rev 3) label, no new hazard info. Your governing deadline is November 20, 2026 (29 CFR 1910.1200(j)(2)(ii)). By that date you must, as necessary, update any alternative workplace labeling you use under 29 CFR 1910.1200(f)(6), refresh your written HazCom program, and train workers on newly identified hazards. If the supplier's refreshed SDS shows no new hazard for your solvent, there is nothing new to relabel or train on; if it shows a new pictogram or hazard class, update the labels, the program and the training to match. Until then you may run under the 2012 HCS, the 2024 HCS, or both.
2) Manufacturer shipping a cleaning blend that just got a new hazard finding. As a mixture, your re-classify/re-label deadline is November 19, 2027 (29 CFR 1910.1200(j)(3)(i)). But the new significant hazard information starts both short clocks immediately: the revised SDS within 3 months (29 CFR 1910.1200(g)(5)) and the revised label within 6 months (29 CFR 1910.1200(f)(11)(i)) — both due far sooner than 2027.
What to do next
- Re-classify each product against the GHS Rev 7 criteria and the new Appendix B classes; keep the rationale on file.
- Re-label. Manufacturers reprint shipped-container labels under (f)(1); employers relabel workplace/secondary containers under 29 CFR 1910.1200(f)(6) (full GHS, or identifier + hazard info).
- Update the SDS to the 16-section format and push it downstream; honor the 3-month clock when new hazard info arrives.
- Refresh the written program and re-train workers, and document it for inspection.
Frequently asked questions
When must I update a safety data sheet after learning new hazard information?
Within three months — but read who it binds. 29 CFR 1910.1200(g)(5) puts the three-month clock on "the chemical manufacturer, importer or employer preparing the safety data sheet", and it covers the SDS only. An employer who simply receives sheets from suppliers is not on that clock; the supplier ships the revised sheet with the first shipment after it is updated (1910.1200(g)(6)(i)). The label is a different rule with a different window: 29 CFR 1910.1200(f)(11)(i) gives six months, and it names manufacturers, importers, distributors, or employers — so your in-house labels do have a dated duty, just not a three-month one.
What is the HazCom 2024 re-label deadline for an employer using a substance?
November 20, 2026, under 29 CFR 1910.1200(j)(2)(ii). By that date employers must, as necessary, update any alternative workplace labeling used under (f)(6), the written hazard communication program, and training for newly identified hazards of hazardous chemical substances. This is the original July 20, 2026 date plus the four-month extension finalized January 15, 2026 (FR Doc. 2026-00653).
What is the deadline for a manufacturer to re-label and re-classify a mixture?
November 19, 2027, under 29 CFR 1910.1200(j)(3)(i). Chemical manufacturers, importers, and distributors must classify mixtures under the updated criteria and ship them with compliant labels and SDSs by that date. There is no separate distributor date.
Do I need to re-classify products for Chemicals Under Pressure?
Possibly. Chemicals Under Pressure (Appendix B.3.2), Desensitized Explosives (Appendix B.17), and Aerosols including the new Category 3 (Appendix B.3) are real, finalized physical-hazard classes added by HCS 2024 — they are not optional or fabricated. If a product meets the criteria, it must be classified and communicated for that class by your applicable (j) deadline.
Which GHS revision does HCS 2024 align with?
Primarily GHS Revision 7, with select provisions drawn from Revision 8. A label that still reflects the 2012 HCS (built on GHS Revision 3) must be brought up to the HCS 2024 / GHS Rev 7 elements by your applicable 29 CFR 1910.1200(j) deadline.
Can I keep using my current labels until the deadline?
During the interim transition period you may comply with the 2012 HCS, the 2024 HCS, or both. Once your specific (j) deadline passes, only the 2024 HCS (primarily GHS Revision 7) satisfies the standard for your role and product kind. Note that the three-month SDS-update rule under (g)(5) applies independently and immediately when you receive new significant hazard information.
Sources & verification
- https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/section-1910.1200
- https://www.federalregister.gov/documents/2026/01/15/2026-00653/hazard-communication-standard
- https://www.osha.gov/hazcom/rulemaking/extension
Deadlines verified 2026-06-23 against eCFR / Federal Register. This planner is informational for planning only — it is not legal advice and not a product-specific hazard classification. State-Plan states (e.g. California, Michigan, Washington) may set their own dates.
HCS 2024 deadline lookup →Secondary-container label maker →GHS Rev 7 transition wizard →Written HazCom program generator →