we offer pp mesh nonwoven fabric. 1. non-toxic, no objectional odor and it is disposable;2. synthetic fiber with gradual density;3. small initial resistance, high efficiency, large dust capacity, washable4. good flame retardant, fire rating reach to s4.5. common thickness is: 5mm, 10mm, 15mm, 20mm, 25mm. specification can be customized according to the requirement.