ADR hazard number X333
Hazard identification number X333 on the orange plate: pyrophoric liquid that reacts dangerously with water.
Printed in the upper half of the orange-coloured plate above the UN number, X333 identifies a pyrophoric liquid that reacts dangerously with water. This is one of the figure combinations that 5.3.2.3.1 gives a special meaning, read as a whole rather than figure by figure. The leading X warns that the substance reacts dangerously with water, so water may be applied only with expert approval.
| X | prefix X: the substance reacts dangerously with water; water may be used on it only with the approval of experts |
|---|---|
| 3 | flammable liquid (vapours) or gas, or a self-heating liquid |
| 3 | repeated 3: doubling a figure means that hazard (flammable liquid) is intensified |
| 3 | repeated 3: doubling a figure means that hazard (flammable liquid) is intensified |
Note. 5.3.2.3.1 lists 333 among the combinations with a special meaning, so read it as a whole from the 5.3.2.3.2 list; the per-figure reading in digits[] does not fully apply. In the 5.3.2.3.2 list this entry carries footnote 1: water is not to be used except with the approval of experts. Number and meaning pairing checked against a second text extraction of the list.
Refers to: 5.3.2.3.1; 5.3.2.2.3; Table A column (20).
Carried by 2 Table A entries
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 5.3.2.3.2, X333, page 267.
Paraphrase in FreightUtils' own words, not the official text. Not yet reviewed.
ADR 2027 amendments (accepted, applying from 1 January 2027) are not yet reflected on this page.