Woven Polyester fabrics have been used for more than 60 years as sailcloth.
Kevlar® is stronger than steel – and lighter. 4 kinds: Type 29 better in flex than type 49. Type 49 50% better in stretch than 29. Twaron® is very similar to type 49. Technora® is between 29 and 49, is available in black and gold.
Dyneema® has extremely long molecular chains, therefore enormous breaking strength.
Yarns and fabrics are called Nylon. Brand name of Du Pont, but never copyrighted, therefore used generically for all thermoplastic polyamides.
Vectran® is based on polyester with aramid type molecular structure to combine the pros of both materials. Vectran® is a quasi-polyester. Colour is gold.
Woven Polyester (Dacron)
Woven polyester fabrics are developed to a very high standard. Polyester is the most used sailcloth, known as Dacron, Tetoron, Terylene, Trevira and Diolen too.
Technically, Taffetas are all types of fine, light woven fabric (for example silk). Taffeta for sail production are tight woven polyester as layer on laminates for better resistance against UV, tear, flex and chafe.
Nylon can be woven very tight, fabric is light and strong.