... pressure reducing, flux is great, high efficient, comparing with other pall ring, HYPAK filling has lower pressure reducing ... isooctane/mehylbenzene2. Plastic pall ringa. Materialstainless steel, carbonsteel aluminum, bronze, 304L, 316L, and other alloy.carbon seep aluminium, ... pressure reducing, flux is great, high efficient, comparing with other pall ring, HYPAK filling has lower pressure reducing ...