The suitability of the substance for carriage in tanks shall be demonstrated to the satisfaction of the competent authority of every country through or into which the carriage is performed.

The method to evaluate this suitability shall be approved by the competent authority of any ADR Contracting Party who may also recognize an approval granted by the competent authority of a country which is not an ADR Contracting Party provided that this approval has been granted in accordance with the procedures applicable according to ADR, RID, ADN or the IMDG Code.

Substances shall not be allowed to remain in the tank for any period that could result in caking. Appropriate measures shall be taken to avoid accumulation and packing of substances in the tank (e.g. cleaning etc.).