ADR hazard number X839
HIN X839 (orange plate): corrosive or slightly corrosive, flammable (flash-point 23-60 °C), violent-reaction risk, reacts dangerously with water.
Printed in the upper half of the orange-coloured plate above the UN number, X839 identifies a corrosive or slightly corrosive substance, flammable (flash-point 23 °C to 60 °C inclusive), able to lead spontaneously to a violent reaction, and that reacts dangerously with water. 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 |
|---|---|
| 8 | corrosive |
| 3 | flammable liquid (vapours) or gas, or a self-heating liquid |
| 9 | risk of a spontaneous violent reaction (by the nature of the substance: explosion, disintegration or polymerization with much heat or flammable and/or toxic gases released) |
Note. 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 1 Table A entry
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 5.3.2.3.2, X839, page 269.
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.