Fiberglass sewing thread is composed of fiberglass yarn thread with PTFE. It features high tensile strength, good sewing property and high temperature textiles. It necessary fitting material used to sew filter bags on industrial high-speed sewing machine, also used to sewing weak alkali-resistant weave and sewing high temperature textiles. It can be used below 300℃ . deg for a long period ,with high tensile strength.