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Rope Fiber Selection Guide

Fiber Properties and Typical Values

Strength Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Breaking Tenacity–(grams/denier) 5.0–6.0 7.0–9.5 7.0–9.5 6.5 6.0 18–26.5
Wet Strength vs. Dry Up to 120% 85–90% 100% 100% 100% 95%
Shock-load Absorption Ability Poor Excellent Good Very Good Fair Poor
Weight Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Specific Gravity 1.38 1.14 1.38 0.91 0.95 1.44
Floats No No No Yes Yes No
Elongation Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Percent at Break 10–12% 18–25% 12–15% 15–25% 15–25% 1.5–3.6%
Creep(extension under sustained load) Very Low Moderate Low High High Very Low
Effects of Moisture Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Water Asorption of Individual Fibers Up to 100% 2–8% < 1% None None 3.5–7.0%
Dielectric Properties Very Poor Poor Good Excellent Excellent Poor
Degradation Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Resistance to UV in Sunlight Good Good Excellent Poor (black is best) Fair (black is best) Fair
Resistance to Rot and Mildew Poor Excellent Excellent Excellent Excellent Excellent
Storage Requirements Dry Only Wet or Dry Wet or Dry Wet or Dry Wet or Dry Wet or Dry
Rope Abrasion Resistance Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Surface Good Very Good Excellent Good Good Fair
Internal Fair Excellent Excellent Good Good Poor
Thermal Properties Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Melts at Does not melt, Chars at 350° 420–480° 490–500° 330° 275° 800° begins to decompose
Resistance 3* Manila Nylon Polyester Polypropylene Polyethylene Kevlar 1*
Resistance to Acids Poor Fair Good Excellent Excellent Fair
Resistance to Akalis Poor Very Good Fair Excellent Excellent Fair
Resistance to Oils and Gas Poor Very Good Very Good Very Good Very Good Very Good

1* Based on DuPont Kevlar® data

Caution:


Use of Working Loads

Because of the wide range of rope use, rope condition, and exposure to the various factors affecting the rope, it is impossible to make blanket recommendations
as to the correct choice of rope to use. However, we have provided the tensile strength for each diameter and type of rope. These strengths are based on tests of
new and unused rope, with appropriate splices. Proper choice, care and inspection of the rope are essential for reasonably safe use of the rope. Consult your cordage
vendor for proper use.

Dynamic Loading Voids Normal Works Loads

Dynamic Loading occurs when rope is subjected to sudden or extreme stress. Figures given as working loads are void if rope has been subjected to dynamic loading,
high temperatures, long periods of load, extreme stress, improper use or storage.

Effect of Temperature on Tensile Strength

The tensile strength charts apply to ropes tested at normal room temperature (70°F). Ropes have lower tensile strength at higher temperatures. Continued exposure
at elevated temperatures causes permanent damage.


WARNING! MISUSE OF ROPES COULD RESULT IN SERIOUS INJURY.