ADR special provision 603
Anhydrous hydrogen cyanide not fitting UN 1051 or UN 1614 is prohibited; < 3 % water, pH 2.5 ± 0.5, clear counts as stable.
Anhydrous hydrogen cyanide that does not match the description of UN 1051 or UN 1614 may not be carried. Hydrogen cyanide with less than 3 % water is regarded as stable when clear and colourless with a pH of 2.5 ± 0.5.
| Value | Applies when |
|---|---|
| 3 % water | upper water content for the stability criterion |
| 2.5 ± 0.5 pH | pH range for stability |
Carried by 2 Table A entries
Source: ADR 2025 (ECE/TRANS/352), Volume I, section 3.3.1, special provision 603, page 647.
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.