The specific gravity of polyester is 1.38; the melting point is 255～260℃, and it starts to bond at 205℃. The safe ironing temperature is 135℃; the moisture absorption is very low, only 0.4%; the breaking strength of filament is 4.5～5.5 g/denier , Short fiber is 3.5～5.5g/denier; the elongation at break of filament is 15～25%, short fiber is 25～40%; the strength of high-strength fiber can reach 7～8g/den, and the elongation is 7.5～ 12.5%.
Polyester has excellent wrinkle resistance, elasticity and dimensional stability, good electrical insulation properties, resistance to sunlight, abrasion, mildew and moth, good resistance to chemical reagents, and resistance to weak acids and alkalis. At room temperature, it has a certain resistance to dilute and strong acids, but it has poor resistance to strong alkalis. The dyeing performance of polyester is poor, and it is generally required to be dyed with disperse dyes at high temperature or in the presence of a carrier.
Polyester has many excellent textile properties and wearability. It can be used in a wide range of applications. It can be purely woven or blended with natural fibers such as cotton, wool, silk, hemp and other chemical fibers. Wool-like, cotton-like, silk-like and linen-like fabrics with good washability, easy-to-dry, non-iron and washable and wearable properties.
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