ADR hazard number 20
Hazard identification number 20 on the orange plate: asphyxiant gas, or a gas with no subsidiary hazard.
Printed in the upper half of the orange-coloured plate above the UN number, 20 identifies an asphyxiant gas, or a gas with no subsidiary hazard. The trailing zero shows that the first figure alone describes the hazard.
| 2 | gas given off, either because of pressure or through a chemical reaction |
|---|---|
| 0 | no further hazard: a single figure describes the hazard adequately, so it is followed by zero |
Note. 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 48 Table A entries
UN 1002 · UN 1006 · UN 1009 · UN 1013 · UN 1018 · UN 1020 · UN 1021 · UN 1022 · UN 1028 · UN 1029 · UN 1046 · UN 1056 · UN 1058 · UN 1065 · UN 1066 · UN 1078 · UN 1080 · UN 1858 · UN 1952 · UN 1956 and 28 more UN numbers
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 5.3.2.3.2, 20, 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.