This gas may also be packed in capsules under the following conditions:
(i) The mass of gas shall not exceed 150 g per capsule;
(ii) The capsules shall be free from faults liable to impair the strength;
(iii) The leakproofness of the closure shall be ensured by an additional device (cap, crown, seal, binding, etc.) capable of preventing any leakage of the closure during transport;
(iv) The capsules shall be placed in an outer packaging of sufficient strength. A package shall not weigh more than 75 kg.