... Cyanogens chloride: not less than 50 minutes at 30 L/min.(1),5mg/L, 80-80% RH conditions.Hydrocyanic acid: not ... less than 50 minutes at 30L/min, 3mg/L conditions.( ... Storage life: More than 8 years.USE AND MAINTENANCE(1),The MF 11 mask is divided into three sizes ... lower part of the face blank with a number:1(small), 2(medium) or 3(large).The user ...