Technical Data

Strength Weight

Normal Size

100 Ft
Diam. Circ.
1/4″ 3/4″ 1.4 6,200
5/16″ 1″ 2.2 9,900
3/8″ 1 1/8″ 3.2 14,400
7/16″ 1 1/4″ 4.3 18,500
1/2″ 1 1/2″ 5.8 26,500
9/16″ 1 3/4″ 7.1 32,000
5/8″ 2″ 8.8 40,000
3/4″ 2 1/4″ 12.7 52,000
7/8″ 2 3/4″ 17.2 69,500
1″ 3″ 23.3 88,000
1 1/8″ 3 1/2″ 29.5 108,000
1 1/4″ 3 3/4″ 33.3 118,400
1 5/16″ 4″ 37.9 130,000
1 1/2″ 4 1/2″ 47.9 161,500
1 5/8″ 5″ 59.2 193,000

Compliance to the above specifications is based upon testing according to the Cordage Institute Standard Testing Methods for Fiber Rope and/or ASTM D-4268 Standard Methods of Testing Fiber Ropes. Weights – Are average and may vary ± 5%. Tensile strengths – Are approximate average for new, unused ropes. To estimate the minimum tensile strength of a new rope, reduce the approximate average by 15% (Cordage Institute defines minimum tensile strength as two standard deviations below the average tensile strength of the rope).

SpecTwelve has minimum deterioration from UV (sunlight) and aging. It is the best of all rope fibers from this standpoint.

Good resistance to most mineral/organics, acids and weak alkalis. Excellent resistance to bleaches and other oxidizing agents and to most solvents.

Due to the relatively low melting temperature of Spectra as compared to other synthetic fibers, care must be taken when using ropes of 100% Spectra fiber to avoid damage due to frictional heat build-up. Examples include rendering the rope around a moving capstan or gpsy head, or running the rope over a fixed surface.

SpecTwelve has good resistance to passage of electrical current in new, clean and dry condition. However, dirt, contaminants and water entrapment can significantly lower dielectric properties. Extreme caution should be used any time a fiber rope is used around energized lines.

Recommended D/d ratio is 8:1

Working Loads:
No blanket working load recommendation can be made because it depends on the application and conditions of use, especially potential danger to personnel. It is recommended that the user establish working loads and safety factors based on professional and experienced assessments of risks. The working load is a guideline for the use of a rope in good condition for non-critical applications and should be reduced where life, limb, or valuable property are involved, of for exceptional service such as shock,sustained loading, severe vibration, etc. The Cordage Institute specifies that the Safe Working Load of a rope shall be determined by dividing the Minimum Tensile Strength by the Safety Factor. Safety factors range from 5 to 12 for non-critical uses.

SWL = Minimum Break Strength
Safety Factor

Quality Assurance:
SpecTweive S/Braid is made to special New England Ropes’ standards using state-of-the-art braiding machinery. They are guaranteed to be free of manufacturing defects and to meet published strength and weight standards. Sample lots are continually tested in the company’s laboratory, and Certificates of Compliance are available on request.

Fabrication Services:
Fabricated units can be provided including thimbles, splices, integral chafe sleeves, etc. Contact Customer Service for details.

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