The only similar thing about them is that both are synthetic fibers. Their properties are entirely different. read more
Spandex is a synthetic fiber with inherent stretch. It is blended with other fibers (nylon, cotton, polyester, rayon, wool) to create woven textiles with stretch, or knitted textiles with better stretch, and also better shape recovery after stretching. read more
The only similar thing about them is that both are synthetic fibers. Their properties are entirely different. Polyester isn't elastic but spandex is and that is the reason why they are used in stretchable fabrics and items that need sufficient amount of elasticity. read more
Polyester is made into various types of yarn or thread and can include both natural and synthetic chemicals. Natural polyesters are biodegradable, but most synthetic versions are not. Products knitted or woven from polyester yarn include clothing, blankets and home furnishings. read more