Permitted only if the vapour pressure does not exceed 110 kPa at 50 °C or 130 kPa at 55 °C.

Special packing provision B11:
Notwithstanding the provisions of 4.1.1.10, UN 2672 ammonia solution in concentrations not exceeding 25% may be transported in rigid or composite plastics IBCs (31H1, 31H2 and 31HZ1).