... Raschig rings packing is open a rectangular fenestrae on the side wall ,fenestrae of window leaf curved into the ... PVC,CPVC,PVDF ...According to your demand!DH:100mm,76mm,50mm,38mm,25mm,16mmFeatures of pall ring:1.low ... ,Carbon Steel,Aluminum,Copper,Monel,Hastelloy,Ni,Ti...According to your demand! 50 50*50*0.8(1.0 ... 60 0.95Material:PP,Super PP,PVC,CPVC...According to your demand! 76 76*76*2.6 1830 73 ...