P roperties For silk producers. 1. e. silk worm. spider etc. silk fibers are for protection transport and food capture Me echanical properties Medium tenacity but higher than wool resulted from molecular structure zigzag B-sheet of silk vs a-helix of wool higher crystallinity than woolProperties For silk producers, i.e. silk worm, spider etc., silk fibers are for protection, transport and food capture Mechanical properties Medium tenacity but higher than wool resulted from molecular structure: zigzag b-sheet of silk vs a-helix of wool higher crystallinity than wool