How to distinguish the fabric is belong to Nylon or polyester ?
Nylon is the stronger, and it is more stretchable than polyester is. This stretch ability occurs because nylon absorbs a small amount of water while polyester does not absorb any. Because it absorbs water more than polyester, nylon does not hold dye well.
When hydrochloric acid drops into the nylon, the nylon melts , but Polyester does not melt .
