ADR hazard number 423

Hazard identification number 423 on the orange plate: solid, flammable solid or self-heating solid that gives off flammable gas on contact with water.

Printed in the upper half of the orange-coloured plate above the UN number, 423 identifies a solid, flammable solid or self-heating solid 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.

Note. 5.3.2.3.1 lists 423 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 46 Table A entries

UN 1340 · UN 1390 · UN 1393 · UN 1394 · UN 1396 · UN 1398 · UN 1400 · UN 1401 · UN 1402 · UN 1403 · UN 1405 · UN 1409 · UN 1417 · UN 1418 · UN 1435 · UN 1436 · UN 2624 · UN 2805 · UN 2813 · UN 2830 and 13 more UN numbers