anti-crack,prevent the defect of mortar from expanding and put off appearance of crack effective. Guards against the crack fiber character1quality: Fiber diameter, small number per liter of 3.5 million root, fiber can widely distributed in mortar or concrete2. Proportion: because the polypropylene fiber manufacturing, its density of 0.913. Strength: fiber generally in 4.5 CN/DTEX strength, $400 ...