PVC gas pipe industry how to development? PVC tube gas ingredient is PVC, PVC gas pipe according to the unique formula production to enhance its heat resistance, toughness and ductility, etc. This pipe to against to the special environment of the coal mine production. And in our daily life have seen PVC pipe has two types: hard PVC tube and soft PVC pipes. Among them, the hard PVC pipe nominal diameter of 50 cm, but the soft PVC tube maximum overall diameter is generally 50 mm.