good filter function the filter foam is widely used in air conditioner,water pump , ... project 1 polyurethane and polyester foam material .2. veticulate,mesh,10ppi to 90ppi.3. good resilient.good air permeability(95 ... <104.could keep the color for a long time5. the filter foam is widely used in air conditioner,water pump ,water ... air fillter foam to USA HenKel company . good aqurium filter foam