1. fire retardant; 2.excellent protection to heat and frame up to 370 ... .usded for heat and frame protective garments; 100% Spun Kevlar Fire-retardant Sewing Thread It is made of 100% spun Aramid 1414 ... garments, tents, etc. Features: It doesn’t meltIt is flame retardant (carbonises at about 370°C)Self-extinguishingGood resistance to chemical ... 3, 30/2, 30/3, 40/2, 40/3, etc. fire retardant sewing thread