|
Fiber Type |
Specific Gravity |
Sticking Temperature ·F |
Melting Temperature ·F |
Ultimate Elongation % | ||||
|
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.
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 MilSpec 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)
CAUTION: If a rope has a tensile strength rating of 500 pounds and has been subjected to heavy loads, say 250 pounds, for example, it has been overloaded. Overloaded antenna support rope should be replaced to maintain reliability.