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).
Polyester jacket protects against UV degradation. The polyolefin fibers are UV stabilized to minimize UV degradation.
Polypropylene has excellent resistance to most acids and alkalis, except chlorosulphonic and concentrated sulfuric acids. Polyester has good resis-tance to most chemicals, except 95% sulfuric acid and strong alkalines at boil. Both fibers resistant to bleaches and oxidizing agents and to most solvents.
The Multiline composite construction surrounds the polypropylene core fibers with a polyester jacket which withstands and dissipates surface heat. Normal rendering over capstans should not cause strength loss. There is likely to be progressive strength loss above 200°F.
The polyester and polypropylene composite strands have good resistance to passage of electrical current. However, dirt, contaminants and moisture entrapment can significantly affect dialectric properties; and extreme caution should be exercised any time this or any rope is used around energized lines.
Recommended D/d ratio is 8:1
No blanket working load recommendation can be made because it depends on the application and conditions of use, especially where there is potential danger to personnel. Cordage Institute Rope Specifications for 3 and 8 strand polyester/polypropylene composite ropes have a safety factor range from 7 to 10, applied to minimum tensile strengths and depending on size – FOR STATIC LOAD CONDITIONS ONLY. Dynamic loading voids working loads as tabulated. It is recommended that the user establish safety factors and working loads based on professional and experienced assessment of risk. The Cordage Institute formula for determining the Safe Working Load is:
||Minimum Break Strength
New England Ropes’ 3-Strand Multiline ropes are made to special standards, established specifically for composite constructions. They are guaranteed to be free of manufacturing defects.
A special lay construction for stringing line use is available which provides added resistance to backturning and hocking. Fabricated units can be provided including splices, thimbles, integral chafe sleeves, etc. Colored surface yarns are also available for coding purposes, on special order.
Fabricated units can be provided including splices, thimbles, integral chafe sleeves, etc. Contact Customer Service for details.