1.Silica sewing thread 2.100%Polyester 3.high tensile strength Silica sewing thread is necessary fitting material and used to sew filter bags,fire blanket on industrial high-speed sewing machine, also used to sew weak alkali-resistant weave.It can be used below 1000°C for a long period of time, with high tensile strength. It will fulfill the need of sewing filter bags used in carbon black/ ...