... :16mm,25mm,38mm,50mm,76mm >20 years professional manufactuer YIQUAN METAL PALL RINGMetal tower packing is made of material like carbon ... , stainless steel or Aluminum alloy, etc. The product has features such as thin wall, heat resistant, high free volume, high capacity, low ... steel, stainless steel including 304, 304L, 410,316, 316L. YIQUAN metal pall ring for petrochemical industry