Metal Pall Ring 2) size: 16mm,25mm,38mm,50mm etc 3) iso 9001:2008 4) SS304, SS304L,SS316,SS316L,carbon steel. Metal Pall Ring is made of material like carbon steel, stainless steel or Aluminum alloy, etc. The product has features such as thin wall, heat resistant, high free volume, high capacity, low resistance, high separation efficiency and so on. It is especially suitable for rectification ...