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Pall rings are Raschig rings' advanced type, but it has better compare area and performance than Raschig rings. We can supply the following material for Pall rings: 1. Ceramic pall rings 2.Polypropylene (PP) pall rings 3.PVC pall rings 4.CPVC pall rings 5.PVDF pall rings 6.PTFE pall rings 7.Nylon pall rings 8.SS304 pall rings 9.SS316 Pall rings 10. Alloy pall rings 11.Monel Pall rings We can supply the following sizes: 5/8" (16mm);1"(25mm);3/2"(38mm) ;2"(50mm);3"(76mm); 4"(100mm)