Micro synthetic fibers are the original generation of synthetic fiber. Synthetic micro-fibers have an even lower E-modulus than synthetic macro-fibers. They are mainly used to reduce early-age shrinkage cracking and also to reduce concrete spalling at high temperatures due to their low melting point (160 °C). Again these synthetic micro-fibers are non-corrosive.It minimizes the formation of cracks due to heat and shrinkage and improves structural integrity.