ADR hazard number 664
Hazard identification number 664 on the orange plate: highly toxic solid that is flammable or self-heating.
Printed in the upper half of the orange-coloured plate above the UN number, 664 identifies a highly toxic solid that is flammable or self-heating. A repeated figure means that hazard is intensified.
| 6 | toxic, or a risk of infection |
|---|---|
| 6 | repeated 6: doubling a figure means that hazard (toxic) is intensified |
| 4 | flammable solid, or a self-heating solid |
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 3 Table A entries
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 5.3.2.3.2, 664, page 268.
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.