How to Test the Physical Properties of Polyester Filament

The physical indexes of polyester filament reflect the physical properties of the fiber in terms of thickness, length, softness, oil content, etc. Understanding these properties is helpful for product users to select appropriate products according to their own production practice, so as to produce products that meet the corresponding standards. Common physical indexes include size, breaking strength, breaking elongation%, crimp shrinkage H.C.C, boiling water shrinkage BWS, OPU%, etc.