The following IBCs are authorized, provided the general provisions of 4.1.1, 4.1.2 and 4.1.3 are met:
Metal (31A, 31B and 31N);
Rigid plastics (31H1 and 31H2);
Composite (31HZ1 and 31HA2, 31HB2, 31HN2, 31HD2 and 31HH2).
Special packing provisions:
The pure form of this substance shall not be transported in IBCs since it is known to have a vapour pressure of more than 110 kPa at 50°C or 130 kPa at 55°C.
Notwithstanding the provisions of 18.104.22.168, UN 2672 ammonia solution in concentrations not exceeding 25% may be transported in rigid or composite plastics IBCs (31H1, 31H2 and 31HZ1).
For UN Nos. 3532 and 3534, IBCs shall be designed and constructed to permit the release of gas or vapour to prevent a build-up of pressure that could rupture the IBCs in the event of loss of stabilization.