Polyester Filter Bag 1.Material:Needle felt Polyester 2.Welding or Sewing 3.Plastic Ring or Steel Ring 4.Size,#1,#2,#3,# Polyester Liquid Filter Bag was made by PP,PE,Nylon,Nomex and Oil Absorbent.And they were used in liquid purified with filter bag vesse together. 1).Nominal micron filter bags (#1,#2,#3, ) 2).Absolute micron filter bags.(#1,#2,#3, ) 3).Long time filter bags.(#1,#2,#3, ...