The difference between polyester and spandex:
1. Strength: The short fiber strength of polyester is 2.6～5.7cN/dtex, and the high-strength fiber is 5.6～8.0cN/dtex. Because of its high strength, it is widely used in ropes, fishing nets and other high-strength requirements. Tools. In comparison, the strength of spandex is very poor, so in terms of strength, polyester is the best.
2. Hygroscopicity: The internal molecular structure of polyester is tightly arranged and lacks hydrophilic groups, so the moisture regain is low and the hygroscopicity is poor. The same is true for spandex, which also has poor moisture absorption. ,
3. Elasticity: The elasticity of polyester is close to that of wool. When it is stretched close to 5 to 6 percent, it can be fully recovered. The elasticity of spandex is better than that of polyester. Spandex can stretch 5 to 7 times longer than its original length. With its elasticity, it is widely used on stretch pants. Spandex has better elasticity.
4. Heat resistance: Polyester can resist exposure to sunlight and can be exposed to sunlight for a thousand hours. The heat resistance of spandex is average.
5. Others: Spandex has good light resistance, acid resistance, alkali resistance and abrasion resistance at the same time. Polyester is resistant to light, abrasion, and corrosion, but hot alkali can decompose polyester.

Polyester:
Characteristics: Polyester is an artificial fiber, with the characteristics of artificial fiber, high strength, strong pressure resistance, heat resistance, and the strength can be maintained at 60% to 70% when exposed to the sun for a thousand hours, but Fabric made of polyester has poor hygroscopicity.
Uses: Because polyester is an artificial fiber, it can be blended with cotton, linen and wool to make various fabrics. Because of its strong pressure resistance and resistance to sun exposure, it can be made into fishing nets, ropes, tire cords, etc. in industry, and it can also be used as an insulating material.
Spandex:
Characteristics: Like polyester, spandex is also an artificial fiber, but the biggest difference with polyester is that spandex is not pressure resistant. The common point with polyester is that it has poor moisture absorption. Spandex has its own unique characteristics. Its elasticity is very good. Professional tests have shown that spandex can extend 5 to 7 times its original length, and it is resistant to light and abrasion.
Uses: Spandex is most famous for its elasticity. With its elasticity, it is widely used in underwear, underwear, tights, casual wear and sportswear. It is also used in the medical field: bandages are also made of spandex.