Both Polyester and Rayon are synthetic. Polyester is the stronger,launders well & good for work wear. Rayon is more shiny, bigger colour selection and good for delicate clothes and intricate detail.
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Actually, rayon is made from cellulose (plant fibres) and so is classified as 'semi synthetic'. Viscose is also from the same family, and cupra - artificial silk.
Polyester is from oil! Rayon, linen from plant, acetate from wood. When using Cotton you want Long stable.(I think ELS). Also thread there are 2 standards, so it is impossible to know if wt is the same between manufacturers. Live Laugh Download Stitch!