Rope Fibers

Fiber Materials

ARAMIDS

  • Para-phenylene terephthalamide is a low stretch, high strength fiber.
  • Good resistance to creep and high temperatures.
  • Kevlar, Technora and Twaron
  • Good resistance to creep and high temperatures
  • UV and abrasion resistance are poor, which means that the rope core will need a cover such as polyester.
  • Aramids have a poor resistance to knots and bending requiring large sheaves on pulleys.

HMPE

  • High Modulus Polyethylene is a low stretch high strength fiber.
  • Dyneema and Spectra.
  • Lighter than Aramids
  • Doesn’t suffer from the same degree of strength loss when used around smaller diameter sheave ratios.

VECTRAN

  • Vectran or Aromatic Liquid Crystal Polyester
  • High strength low stretch material.
  • Vectran has very low creep and a higher tenacity than Aramids
  • Very resistant to heat.

PBO

  • PBO poly (p-phenylene-2, 6-benzobisoxazole)
  • Marketed under the trade name Zylon.  This material is relatively new to the market.
  • PBO is one of the strongest materials currently available for rope making.
  • Very low stretch and exceptional resistance to high temperatures.
  • Needs to be protected from UV and abrasion.

POLYESTER

  • Excellent resistance to UV and abrasion
  • Unaffected by water
  • Polyester is the material used in protective cover braids and also in ropes made of pure polyester ropes such as polyester double braids and 3 strand.

Nylon

  • Polyamide
  • This material when dry is slightly stronger than Polyester but is slightly weakened when wet.
  • Nylon has good UV and abrasion resistance.  The primary advantage of nylon over other materials is its 30% stretch to break. Ideal in applications where energy absorption is a needed such as mooring, docking, or anchoring.

POLYPROPYLENE

  • Very light material which floats in water.
  • Low resistance to UV and abrasion.
  • Polypropylene has a good resistance to a large range of chemicals.

 

Grades of Dyneema

SK99

  • Launched in 2013, this is the latest from DSM Dyneema.
  • SK99 has 20% strength advantage over SK78 and crucially retains the same elongation and creep characteristics as SK78 thus outperforming SK90 on every level.
  • SK99 has an unmatched strength to weight ratio and has carved a niche for itself as the ultimate performance core material.

SK99

  • This is currently the standard grade used by manufacturers. It has the same strength but offers significantly improved creep and elongation characteristics.

SK 75

  • The standard for many years, but is being used less in pleasure marine because of the improved grades now available.

SK90

  • This grade offered 10-15 % more strength over SK 75/78 but has the same creep and elongation as SK75. Launched in 2009.

DM20

  • Has a lower grip characteristic than SK78.
  • Has almost zero creep.
  • Primarily used for static load applications. (Standing Rigging)