Our PTFE coated glass fiber with SS wire reinforced sewing thread is made from from high purity, very fine continuous filament yarns . Our SUN-SS-series thread reduces seam failure due to thermal shock & exposure, offers excellent tensile strength even at 1000 deg. Fahrenheit and has a stainless steel wire twisted right into the thread! Our uniform PTFE coating completely encapsulates the thread, enhancing resistance to buildup of contaminants and repelling attack by most acids, alkalis and are UV stable. SUN sewing thread will not support combustion. Also the coating improves handling characteristics, abrasion resistance and sewability.