... feature1,Good flexibility, acid, alkali, corrosion and aging resistance,2,high strength, stable size, good water penetration, filter and ... and marsh land reclaiming projects; flood prevention and emergency rescue.2. Road, railway and airport projects: Soft foundation reinforcement treatment ... .2 vertical permeability,cm/s Kx(10-1~10-3) tear strength(3),kN ≥ 0.08 short fiber needlepunched nonwoven ...