OUT OF STOCK UNTIL FEBRUARY 14, 2021. 1/8” square, a firm dense packing that is tightly woven. Each strand is thoroughly impregnated with Teflon dispersion before braiding. This serves as a sealant between the individual fibers to prevent leaking through the braid structure. Good to 500o F on water pumps, steam cylinder oil pump, & hand valves that do not exceed 500o F.