The following chart illustrates many of the characteristics of synthetic fibers that are commonly used in twines. The requirements needed for a specific application will determine which fiber is best. Example: If the requirement is for a lightweight twine that floats and is resistant to mildew, then polypropylene or polyethylene will be best. If, on the other hand, a twine with high tensile strength is to be used underwater, then nylon or polyester will be best. 

        Ultra High 
        Molecular Weight
    (Polyamide)   (UHMWPE)
Grams per denier  7.0- 9.56.5 -8.56.0-7.3630
Shock Load Absorption ExcellentGoodFairFairFair
Percent on Break  18-25%22%24%15-20%3.50%
Creep   ModerateModerateHighHighModerate
Specific Gravity  1.141.380.890.950.97
Floats   NoNoYesYesYes
Effects of Moisture       
Water Absorption  2-8%1%NoneNoneNone
Dielectric Properties PoorPoorExcellentExcellentExcellent
Resistance to Ultra Violet GoodGoodFairFairFair
Resistance to Rot & Mildew ExcellentExcellentExcellentExcellentExcellent
Thermal Properties       
Melts at    420-480 F482 F330 F275 F297 F
Resistance to Acids  FairFairExcellentExcellentExcellent
Resistance to Alkalis Very GoodVery GoodExcellentExcellentExcellent
Resistance to Oil and Gas Very GoodVery GoodVery GoodVery GoodVery Good