1. The strength of PBT fiber is 30.91~35.32cN/tex, the elongation is 30%~60%, the melting point is 223 °C, and its crystallization rate is 10 times faster than that of polyethylene terephthalate.
2. The fiber made of PBT has some properties common to polyester fiber, but due to the long flexible part on the basic link of PBT macromolecule, the melting point and glass transition temperature of PBT fiber are lower than that of ordinary polyester fiber, resulting in the improvement of the flexibility and elasticity of the fiber macromolecular chain.
3. PBT fiber has good durability, dimensional stability and good elasticity, and the elasticity is not affected by humidity.
4. PBT fiber and its products have a soft feel, good moisture absorption, wear resistance and fiber crimping, excellent tensile elasticity and compression elasticity, and its elastic recovery rate is better than that of polyester. PBT fibers have special elasticity under both wet and dry conditions, and their elasticity is not affected by changes in ambient temperature.
5. It has good dyeing performance, and ordinary disperse dyes can be used for atmospheric boiling dyeing without carrier. The dyed fiber has bright color, excellent color fastness and chlorine resistance.
6. It has excellent chemical resistance, light resistance and heat resistance.