1.weight 500g/m2 2. Working temperature 260-280'C3.Thickness: 1.9mm 4. Air permeability 200-270mm/s 5. Finishing heating singe P84 Needle Felt characteristics: high temperature resistance, good chemistry resistance, good air permeability, high filtration efficiency, but the price is high. It mostly applied in cement kiln, waste incinerator, etc