... ,76mm >20 years professional manufactuer YIQUAN METAL PALL RINGMetal tower packing is made of material like carbon steel, stainless steel or ... or cokable systems, so it is widely used in packing towers in petrochemical industry, chemical fertilizer industry and environmental protection, etc. Geometric ... 304, 304L, 410,316, 316L. YIQUAN metal pall ring for petrochemical industry