SPECTER™ Monofilament Fibers are manufactured from 100% virgin homopolymer polypropylene resins. SPECTER™ Fibers meet the requirements of ASTM C1116/C1116M “Standard Specification for Fiber Reinforced Concrete”, ASTM D7508/D7508M “Standard Specification for Polyolefin Chopped Strands for use in Concrete”, and the requirements of ICC ES AC32 Section 3.1.1 for plastic shrinkage reinforcement.