ADR special provision 408
Entry only for aqueous TMAH solutions with ≤ 1 % other constituents; surfactant formulations go to UN 2927 PG I or II by TMAH content.
This entry is limited to solutions of tetramethylammonium hydroxide (TMAH) in water with no more than 1 % of other constituents. Other TMAH formulations go to a suitable generic or N.O.S. entry, for example UN 2927 TOXIC LIQUID, CORROSIVE, ORGANIC, N.O.S., subject to the two cases in conditions.
| Value | Applies when |
|---|---|
| 1 % | maximum other constituents for this entry; also the surfactant level above which the UN 2927 rules apply |
| 8.75 % TMAH | at or above, with surfactant > 1 %: UN 2927 PG I |
| 2.38 % TMAH | above, and below 8.75 %, with surfactant > 1 %: UN 2927 PG II |
Conditions
- (a) Surfactant above 1 % and TMAH not less than 8.75 %: UN 2927, packing group I.
- (b) Surfactant above 1 % and TMAH above 2.38 % but below 8.75 %: UN 2927, PG II.
Refers to: UN 2927.
Carried by 3 Table A entries
Source: ADR 2025 (ECE/TRANS/352), Volume I, section 3.3.1, special provision 408, page 641.
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.