What are the common characteristics of polyester yarn?

What are the common characteristics of polyester yarn? What are the advantages of pure polyester yarn?
1. High strength. The strength of short fiber is 2.6 ~ 5.7cN/tex, and the strength of high fiber is 5.6 ~ 8.0cN/tex. Because of its low hygroscopic property, its wet strength is basically the same as that of dry strength. Impact strength is 4 times higher than nylon, 20 times higher than viscose fiber.
2. Good elasticity. The elasticity is close to wool, and can be almost completely recovered when the elongation is 5 ~ 6. Wrinkle resistance is more than other fibers, that is, the fabric does not wrinkle, good dimensional stability. The elastic modulus is 22 ~ 141cN/.
3. Heat resistant polyester is made by melt spinning, the formed fiber can be heated and melted again, belonging to thermoplastic fiber. The melting point of polyester is relatively high, and the specific heat capacity and thermal conductivity are smaller, so the heat resistance and heat insulation of polyester fiber are higher. It's the best in synthetic fibers.
4. Polyester has a smooth surface and tightly packed molecules inside. Polyester is a synthetic fiber fabric with good heat resistance, thermoplastic, can be made into pleated skirts, pleats. At the same time, polyester fabric has poor melting resistance, and it is easy to form holes when it meets soot and sparks. Therefore, wear should try to avoid contact with cigarette butts, sparks and so on.
5. Good wear resistance. The wear resistance is second only to the good wear resistance nylon, better than other fibers and synthetic fibers.
6. Good light resistance. Light resistance is second only to acrylic fiber. Polyester fabric has better light resistance, in addition to being worse than acrylic, its sun resistance is better than fiber fabric. Especially in the glass behind the sun fast ability is very good, almost equal to acrylic fiber.