Sources and revision notes

Regulations and editions

• UN GHS Rev.11 (ST/SG/AC.10/30/Rev.11, 2025): chapter 1.4 (1.4.10.3 symbols, 1.4.10.4 pictograms, 1.4.10.5.3 precedence), Annex 1, Annex 3 section 3 (label elements by class and category) and section 4 (pictogram codes, Table A3.4.1). unece.org
• US OSHA, 29 CFR 1910.1200 Appendix C (C.2.1 precedence, C.2.3 pictograms, Figure C.1), as amended by 89 FR 44144 (May 20, 2024) and later corrections; 1910.1200(f)(5)(iii). Read on eCFR, version current on 2026-10-20. ecfr.gov
• EU CLP, Regulation (EC) No 1272/2008, consolidated text of 1 July 2026: Article 26 (precedence), Annex I section 1.2.1 (format and size), Annex V (pictograms). eur-lex.europa.eu
• Canada, Hazardous Products Regulations SOR/2015-17 (current to 2026-09-30, last amended 2022-12-15): s. 3(1)(c) to (d), 3(3), 3(3.1), 3.1, 3.6(3), Schedules 3 and 5. "GHS" in the HPR means the Seventh Revised Edition. laws-lois.justice.gc.ca
• Mexico, NOM-018-STPS-2015 (DOF, 9 October 2015): 4.39, 10.5, 10.6, Appendix A and Appendix B (B.3). Section 16 says it is partly equivalent to the GHS 5th revised edition. asinom.stps.gob.mx

Pictogram images

• Pictogram image files: copies of the EPS and PNG files on the US OSHA Hazard Communication Pictograms download page (osha.gov/hazcom/pictograms, downloaded 2026-10-20). Works of the US federal government are not subject to US copyright (17 U.S.C. 105). 17 U.S.C. 105

The symbols themselves are set out in Figure C.1 of 29 CFR 1910.1200 Appendix C on eCFR.

The UN publishes its own GIF and EPS files on unece.org; we link to them and do not host copies.

Revision notes and limits

• UN GHS Rev.11, Annex 3 section 3 prints “H331 Toxic in contact with skin” for acute dermal toxicity, Category 3. Annex 1 and Annex 3 section 1 give H311 for that category, so the guide shows H311.
• Explosives, Category 2C with the exclamation mark and H204 comes from UN GHS Rev.11. OSHA (unstable explosives and Divisions 1.1 to 1.6, Appendix B.1.2), EU CLP (Divisions, Annex V) and Mexico (Divisions 1.1 to 1.4, Table B.3) use the older division scheme. The HPR has no explosives hazard class: Part 7, Subpart 1 (s. 7.1) is reserved.
• Hazardous by contributing to global warming (H421) was added in UN GHS Rev.11 and is not in the OSHA HCS, the HPR or NOM-018.
• OSHA's 2024 update aligns the HCS primarily with GHS Revision 7 (89 FR 44144). Canada's HPR uses GHS Rev.7, with Rev.8 for chemicals under pressure. NOM-018 is partly equivalent to the GHS 5th revised edition.
• Canada and Mexico notes summarize which pictograms are used and the precedence rules. They do not list every category that takes each pictogram; use HPR s. 3(1)(c) with GHS Rev.7 Annex 3, Schedule 5 for the HPR-specific classes, and NOM-018 Table B.3.
• The US OSHA column follows Figure C.1, which lists hazards by pictogram. Check the Appendix C tables for each category.
• Canada: for Physical or Health Hazards Not Otherwise Classified, Category 1, the label uses any Schedule 3 symbol that applies to the hazard, with the signal word Danger. Combustible dusts and simple asphyxiants carry no symbol and use Warning (HPR Schedule 5).
• Mexico: NOM-018 is partly equivalent to the GHS 5th revised edition (section 16), so its class and category lists differ from Rev.11.

This is a reference, not legal advice. Check the regulation for the market you sell into before you label or write an SDS.