... % virgin polypropylene 2. Density:0.91-0.93g/cm3 3. Length:6,12mm 4. improve property of cement concrete , ... PolypropyleneType MonofilamentColornature whiteequivalent diameter (um)(20um-50um) ±5umLength(mm)3-50mm Elongation at Break (%)20%±5%Tensile Strength(MPA)≥650 ... of tunnels, mines, roofs and reservoir projects with special construction.3) River courses and dams, etc.4) Military defense works, ...