... , SS304L, etc 2 size:16mm,25mm,38mm,50mm,76mm >20 years professional manufactuer YIQUAN METAL PALL RINGMetal tower packing is made of ... , polymerizable or cokable systems, so it is widely used in packing towers in petrochemical industry, chemical fertilizer industry and environmental protection ... steel including 304, 304L, 410,316, 316L. YIQUAN metal pall ring for petrochemical industry