涤纶的比重为1.38;熔点255～260℃,在205℃时开始粘结，安全熨烫温度为135℃；吸湿度很低,仅为0.4%；长丝的断裂强度为4.5～5.5克/旦,短纤维为3.5～5.5克/旦；长丝的断裂伸长率为15～25%，短纤维为25～40%;高强型纤维强度可达7～8克/旦,伸长为7.5～12.5%。涤纶有优良的耐皱性、弹性和尺寸稳定性，有良好的电绝缘性能，耐日光，耐摩擦，不霉不蛀，有较好的耐化学试剂性能，能耐弱酸及弱碱。在室温下，有一定的耐稀强酸的能力，耐强碱性较差。涤纶的染色性能较差，一般须在高温或有载体存在的条件下用分散性染料染色。

Polyester accounted for 1.38; the melting point of 255 to 260 DEG C, are bonded at 205 DEG C, safe ironing temperature is 135 DEG C; moisture absorption is very low, only 0.4%; the fracture strength filament is 4.5 ~ 5.5 grams per denier, short fiber is 3.5 ~ 5.5 g / D; elongation of filament is 15 ~ 25%, short fiber is 25 ~ 40%; high strength fiber strength can reach 7 to 8 grams per denier, elongation of 7.5 ~ 12.5%. Polyester has excellent wrinkle resistance, elasticity and dimensional stability. It has good electrical insulation properties, sunlight resistance, friction resistance, no mildew and no moth. It has good chemical reagents properties, and it can resist weak acid and weak alkali. At room temperature, it has a certain capacity of resistant and strong acid, and the resistance to strong alkalinity is poor. The dyeing property of polyester is poor, and it is usually dyed with disperse dyes under the condition of high temperature or the presence of carrier.