Like wool fiber, silk fiber is an animal fiber.But instead of being grown in the form of hair, it is produced by insects as a handy material with which to build their webs, cacoons and climbing ropes. bran in bread products) or their physical characteristics (e.g. It has its own physical and chemical property which give better processing I spinning, weaving, knitting, dyeing, printing and … It suggests that polyester … Strength : The polyesters are normally stronger. Physical Properties of Wool Fiber: Specific Gravity: 1.31; Length : 35 to 250 mm; Color: The color of wool fiber could be white, near white, brown and black. Caustic soda (NaOH) will completely damage wool when used hot or for a long period. Chemical Properties of Wool Effects of alkali: Wool is easily and extremely vulnerable attacked by alkalis even by weak bases at low dilutions. alkaline solutions can open the disulphide cross-links of wool, white hot alkalis may even dissolve it. They might be naturally present in the food (in cell walls of vegetables and fruits, for instance) or introduced in the food to improve their nutritional properties (e.g. Flame reaction : Odor of burnt horn; Luster: Luster of course fiber is higher than fine fiber. Shape and look : These are typically spherical and uniform. Physical properties of wool fiber; Chemical properties of wool fiber ; 1. gelling agents or improved resistance to storage). we use it for industrial purpose. Cotton fabric are comfortable to wear because of their unique fibre property. Elasticity : Polyester fibers don’t have high degree of snap. it is partly clear and white to slightly off -white in color. Dietary fibre encompasses very diverse macromolecules exhibiting a large variety of physico-chemical properties. Cotton fibre is most used fibre for producing various type of fabric through all over the world. Properties of Polyester Fiber. Wool dissolves when boiled in a 5% solution of sodium hydroxide. Normally polyester has high degree of stretch resistance. Physical Properties.