Leaf filter is mainly used in filter devices of high viscosity melt or hydraulic oil. Common sizes for melt are 5",6",7",8"... Leaf FilterLeaf filter is mainly used in filter devices of high viscosity melt or hydraulic oil. The materials are stainless steel sintered mesh, stainless steel or brass wire mesh. Leaf filters can be repeatedly cleaned and repeatedly used. Common sizes for melt are 5”, ...