1. The strength of PBT fiber is 2.8～4.0cN/dtex, the elongation is 30%～60%, and the melting point is 224℃. Its crystallization speed is 10 times faster than PET. It has excellent elongation elastic recovery rate and softness. Characteristics of dyeing.

2. The fiber made of PBT has some properties shared by polyester fiber, but because the flexible part on the basic chain of PBT macromolecule is longer, the melting point and glass transition temperature of PBT fiber are lower than ordinary polyester fiber , Resulting in increased 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 soft hand feeling, good moisture absorption, abrasion resistance and fiber crimp, excellent tensile elasticity and compression elasticity, and its elastic recovery rate is better than that of polyester. PBT fiber has special stretchability under both dry and wet conditions, and its elasticity is not affected by changes in ambient temperature.

5. With good dyeing performance, ordinary disperse dyes can be used for atmospheric boiling dyeing without carrier. The dyed fiber has bright color, excellent color fastness and chlorine resistance. The dyeing rate at 100°C is equivalent to that of PET at 120°C.

6. Has excellent chemical resistance, light resistance and heat resistance.

7. The disadvantage of PBT fiber is that its heat resistance is slightly inferior to that of PET and PA, and the strong alarm response is an obstacle to the application of PBT in the textile field.