Fiberglass Twisted Yarn Fiber Dia: 5.5 to 13um Spec: EC75, ... /3 1/4 Twist: 28 - 140/M, Z or S Fiberglass Twisted YarnIt is yarn that after processing and twisting fiber ... , 8um, 9um and 13um and be used to make various fiberglass fabrics. 1) Specifications: EC75, EC150, EC225 EC450 1/0 1/2 ... with plastic core, then net weight of roving is 3kg. Fiberglass Twisted Yarn