404.1. Portable tanks used to transport, store or load water-based bulk explosives must(1) be constructed in such manner that the surfaces in contact with the explosives are of a material that will not react with the explosives;
(2) be used only to transport the explosives;
(3) be identified on all sides by the word “EXPLOSIFS” in letters at least 102 mm (4 in) high;
(4) except while loading, have hatches and valves closed and locked or sealed at all times; and
(5) have a maximum capacity of 1,500 kg (3,307 lb) of explosives.