Ini yg saya dpt bila google dlm internet:
Best Answer - Chosen by Asker
I looked it up for you in one of my text books
Lyrca - "The registered trademark owned by the Dupont Company for spandex filament yarn. The soft segments of the segmented polyurethane are forned from polytetramethelyne ether glycol"
Spandex- "A generic fiber category that has been define by the federal trade comission as "a manufactured fiber in which the fiber forming substance is a long chain synthetic polymer composed of at least 85% of a segmented polyurethane." Chararcteristics include excellent elongation and elastic recovery similar to that of rubber. The flexibility, abrasion resistance, strength, and resistance to deterioration by body oils and perspiration are better than rubber. Although spandex can be madeas an uncovered filamentthe fiber always is usedin conjunction with other fibers, most often in covered or core-spun yarns where the spandex is covered by other fibers. "
Simply. Lycra is a type of spandex. It's a brand name. If it is better than a generic type you cant really know for sure
fairchild's Dictionary of Textiles