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  • Synthetic Fibre Yarn Properties

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  • Table 1: Synthetic fibre yarn properties

    Material

    Specific Gravity

    Specific Modulus, N/tex*

    Specific Strength, N/tex*

    Other Characteristics

    Nylon (polyamide)

    1.14

    4

    0.84

    10-15% wet strength loss. Poor wet internal abrasion resistance. Moderate creep.

    Polyester

    1.38

    10

    0.84

    Good wet internal abrasion resistance.

    Polypropylene monofilament

    0.91

    8

    0.73

    Lighter than water, moderate creep, low strength.

    Polypropylene multifilament

    0.91

    3.5

    0.66

    "

    Aramid (Kevlar 29, Twaron, Technora)

    1.44

    49

    2.03

    Axial compression fatigue problem.

    Aramid (Kevlar 49)

    1.44

    78

    2.08

    Extra high modulus.

    HMPE (Spectra 900, Dyneema) High-Modulus Polyethylene.

    0.94-0.97

    124

    2.65

    Low melt point, high creep.

    HMPE (Spectra 1000) High-Modulus Polyethylene.

    0.94-0.97

    175

    3.10

    Extra high modulus. High creep but less than S900.

    LCAP (Vectran) Liquid Crystal Aromatic Polester.

    1.41

    46

    2.01

    New fibre. Very little creep.

    PBO (... Dow) Polybenzoxazole.

    1.56

    177

    2.54

    New fibre Very high modulus. Expensive.
    Steel (wire) 7.85 26 0.18 Typical properties. Corrodes.

     

    * NOTES: Approximate values, actual properties may vary.The unit tex is the weight in grams of 1000 meters of material.Newton/tex = 1 MN/(kg/m) where kg/m is rope linear density.Multiply Newtons/tex by 145,400 x SG to obtain lb/in2.

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