... needle Felt Filter Bags were made by PP,PE,Nylon,Nomex and Oil Absorbent.And they were used in liquid purified with filter bag ... vesse together. 7"x17" PP/PE needle Felt Filter Bags1).Nominal micron filter bags (#1,#2,#3, ... ) 5).Oil absorbed filter bag.(#1,#2,#3, ) 6).High efficiency filter bag.(#1,#2,#3, ) 7).Activated carbon filter bag.(#1,#2,#3 ...