2.2.2.2.1

chemically unstable gases of class 2 shall not be accepted for carriage unless the necessary

precautions have been taken to prevent the possibility of a dangerous decomposition or

polymerization under normal conditions of carriage or unless carried in accordance with special

packing provision (r) of packing instruction p200 (10) of 4.1.4.1, as applicable. for the precautions

necessary to prevent polymerization, see special provision 386 of chapter 3.3. to this end particular

care shall be taken to ensure that receptacles and tanks do not contain any substances liable to

promote these reactions.