product no. : hd 500 pps name: pps needle felt weight(g/m2): 500 material: ryton staple fiber thickness(mm): 2 air permeability(l/m2/s): 200-300 tensile strength: warp:≥900 (n/5×20cm) weft:≥1200 tensile elongation: warp:＜30 (%) weft:＜30 working temp: continuous:190 (℃) short time:230 finishing treatment: heat set,singed one side, calender