... 3.layer:1.2.multilayers perforated stainless steel tube(food/industrial grade) MaterialStainless steel,steel,copper,nickel,titaniumspecificationtable(1) D1mmP mmDmmHmm1.503 ... air, dust, industrial gases & medicine • For food, beverages, agriculture & refrigeration • For petrochemical industry, water treatment processing perforated stainless steel tube(food/industrial grade)