PHYSICAL PROPERTIES OF FIBERS

Fiber Type

Specific Gravity

Sticking Temperature in degrees F

Melting Temperature in degrees F

Ultimate Elongation percentage

Nylon

1.34

455

482

25 - 35

Polyester

1.38

455

599

15 - 25

Polypropylene

.90

302

150

20 - 25

Polyethylene

.95

248

275

15 - 25

Cotton

1.54

-

Decomposes at 302

15 - 20

This information is based on specifications in Rhinos Rope's Catalog, page 36.


Recommended Working loads

Many factors, including rope usage, conditions, and weather exposure affect rope behavior. The recommendations below are generalizations and assume that the rope has not been previously subjected to excessive loads.

Twisted Rope - 10 - 14%

Braided Rope 15 - 20%

Percentages vary with rope size and construction. Use the lower percentage for maximum safety factor.

EXAMPLE: Our Mil Spec rope is a Solid Braid rope rated at 700 pound tensile strength should hold a load of no more than 140 pounds. (700 x 20% = 140) I wouldn't use any rope beyond about 10% of its rated tensile strength if longest life and stretch recovery is desired.


CAUTION: Avoid overload

If, for example, a rope has a tensile strength rating of 500 pounds and has been subjected to heavy loads, say 250 pounds, it has been overloaded. Overloaded antenna support rope should be replaced to maintain reliability.


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