High breaking strength, generally more than 40% higher than that of cotton thread of the same specification; good wear resistance, generally 1 times higher than that of cotton thread of the same specification; small shrinkage, only about 0.5%, suitable for sewing chemical fiber fabrics and anti-wrinkle high-grade cotton Fabric, stitches are flat and stiff; good heat resistance, suitable for high-speed sewing machines of 3000-4000r/min, ironing temperature around 160 ℃; good softness and elasticity, suitable for sewing high-grade chemical fiber fabrics.