Physical hazard · Explosives
H203 — Explosive; fire, blast or projection hazard
Physical hazard statements describe what the substance itself can do — explode, ignite, react, corrode metal. 3 substances with a harmonised EU classification carry this code.
01 · Wording
What H203 says
Explosive; fire, blast or projection hazard.
CLP Annex III · Physical hazards
Explosives GHS chapter 2.1
Category 1.3 · pictogram GHS01 (exploding bomb) · signal word Danger
Deleted from UN GHS in Rev.9 (2021) — still current in CLP.
UN GHS Rev.9 marked this code [Deleted]. EU CLP has not followed: the code is legally current on an EU label today. This is the single most common reason a code looks wrong in one reference and right in another.
The UN replacement is H209, a code that is not part of EU CLP.
Nine editions of the UN model text, 86 hazard statements, 19 of which ever moved. Read the full story in what changed in UN GHS Rev.11.
02 · Legal status
Where H203 is current
GHS is a United Nations model text, revised every two years, and each jurisdiction adopts a revision on its own timetable. A code can be legally current in one system and deleted in another — that is normal, not an error.
| Jurisdiction | Basis | Status of H203 |
|---|---|---|
| EU CLP | Regulation (EC) 1272/2008 CLP Annex IV, Part 2 (consolidated) | Current |
| US OSHA HazCom | 29 CFR 1910.1200 Appendix C UN GHS Rev.7 (final rule of 20 May 2024) | Current |
| US HazCom 2012 | legacy · GHS Rev.3 UN GHS Rev.3, Annex 3 | Current |
| UN GHS | Rev.11 (2025) UN GHS Rev.11, Annex 3 | withdrawn Current equivalent: H209. |
Currently in force under: EU CLP, US OSHA HazCom, US HazCom 2012. Sources: EU CLP · US OSHA HazCom · US HazCom 2012 · UN GHS
03 · Substances
Substances carrying H203
Every entry whose harmonised CLP Annex VI classification includes this hazard statement. Substances with a reference page here open on this site; the rest open on ghssymbols.com.
- 1-hydroxybenzotriazole, anhydrous [1]; 1-hydroxybenzotriazole, monohydrated [2] CAS 2592-95-2[1]123333-5
- reaction mass of: 5-[(4-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-2,5-diethoxyphenyl)azo]-2-[(3-phosphonophenyl)azo]benzoic acid; 5-[(4-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-2,5-diethoxyphenyl)azo]-3-[(3-phosphonophenyl)azo]benzoic acid CAS 163879-69-4
- trilithium-1-hydroxy-7-(3-sulfonatoanilino)-2-(3-methyl-4-(2-methoxy-4-(3-sulfonatophenylazo)phenylazo)phenylazo)naphthalene-3-sulfonate CAS 117409-78-6
Nothing matches that filter.
All hazard statements
The full list of H-codes with the jurisdiction switch lives on the hazard statements hub. For what to do about the hazard, see precautionary statements (P-codes).
Wording quoted from the regulation named above. Substance counts come from harmonised classifications in CLP Annex VI — the statements on a real product also depend on the supplier's own classification. Always check the supplier safety data sheet.