Polyurethane Fibers (Spandex)
Polyurethane fibers, sometimes called Spandex, are synthetic fibers in which the fiber forming substance is a polymer consisting of at least 85 percent segmented polyurethane. The fiber is produced by reacting a polyester with a diisocyanate.
It has elastomeric, rubberlike qualities and is very durable. In fact, it is even more durable than rubber and can be stretched more than 500 percent without breaking. It has good chemical resistance to many diluted acids and alkalis, but some may damage the fiber. Its strength is rather low when compared to most other synthetic fibers and its heat resistance can vary considerably depending on the composition.
Thermoplastic polyurethane elastomers find many applications and are molded and shaped into many different parts. Most of these elastomers can also be spun into fibers, which are called Spandex.
|Tensile Strength (Tenacity)||Poor|
|Absorbency||Fair - Good|
|Resistance to Sunlight||Very Good|
|Flame Resistance||Burns Slowly|
CoMMERCIAL Spandex Fibers
Spandex is used to make elastic textiles such as sock tops, bras, support hose, weatherproof clothing, swimsuits, and other athletic apparel.