ADR hazard number 323

Hazard identification number 323 on the orange plate: flammable liquid that gives off flammable gas on contact with water.

Printed in the upper half of the orange-coloured plate above the UN number, 323 identifies a flammable liquid that gives off flammable gas on contact 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.

Digit by digit
3flammable liquid (vapours) or gas, or a self-heating liquid
2gas given off, either because of pressure or through a chemical reaction
3flammable liquid (vapours) or gas, or a self-heating liquid

Note. 5.3.2.3.1 lists 323 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. 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 6 Table A entries

UN 3148 · UN 3398 · UN 3399

Source: ADR 2025 (ECE/TRANS/352), Volume II, section 5.3.2.3.2, 323, 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.