1.Using in chemical, petroleum, mine 2.30,60,90,120min protective 3.Cylinder from America Detailed Product ... DescriptionSelf contained breathing apparatus 1.Using in chemical, petroleum, mine 2.30,60,90,120min protective 3.Cylinder from America ... is widely used in the fields, such as fire fighting, chemical industry, shipping, petroleum, mine, laboratory, etc. It can provide ...