know more about a Rope
Working Loads -It is impossible to establish hard and fast recommendations
regarding working loads due to the wide range of rope use, rope
conditions, exposure to several factors affecting rope behavior,
and the degree of risk to life and property involved. The
tabulations for working loads are based on new, unused rope in
excellent condition. These are only guidelines, even when having
appropriate splices, and being used in non-critical applications
and under normal conditions. If possible injury to people or damage
to property exist, working loads should be reduced.
Never increase the working load beyond given guidelines without
expert advice as to the conditions and risk involved. It must be
determined that the rope is in excellent condition. Figures given
as working loads are void if the rope has been subjected to dynamic
loading, high temperatures, long periods of load, extreme stress,
improper storage or improper use.
DYNAMIC LOADING - occurs when rope is subjected to sudden or extreme stress such as
abrupt starting or stopping of a load. The effect of dynamic
loading is greater on low-elongation rope, such as polypropylene
than on high-elongation rope, such as nylon. Also the effect is
greater on a short rope than on a long rope.
TENSILE STRENGTHS - are determined from tests on new, unused rope in accordance with
standard test methods of the Cordage Institute, 994 Old Eagle
Schoolhouse Rd., Suite 1019, Wayne, Pennsylvania 19087.
HOLLOW BRAIDS - Fully spliceable, and resistant to moisture and rot. It floats
indefinitely and cannot hockle, kink or backlay. A few of the many
uses for hollow braid rope include water ski tows, anchor lines,
pool rope, dog leashes and applications where quick easy splicing
to hardware or other components is desirable
SOLID BRAIDS - Abrasion resistance, high strength, low stretch and ease of
handling are qualities which make solid braids ideal for
clotheslines, pulleys, tie downs, flag poles, awnings and
applications where strength resistance to wear are important.
TWISTED ROPE - Size for size and pound for pound, is the strongest and least
expensive rope manufactured today. It is a spliceable, general
purpose rope used widely for anchor lines, dock lines, blocks and
tackle, winch ropes, tow ropes, tie downs plus many industrial and
When turned the opposite direction of the rope lay, twisted rope
will hockle. Hockles are detrimental to rope wear and cause
permanent damage when strain is applied.
MaterialNatural Fiber Ropes- Although less affected by sunlight than synthetic fibers, its very
important to recognize the characteristics & limitations of
natural (Abaca) fiber ropes such as manila. Even under ideal
storage conditions, natural fibers will decompose & lose up to
50% of their tensile strength. Because theyre prone to mildew &
dry rot, natural fiber ropes must be stored completely dry.
Synthetic Ropes -Man made fiber ropes are stronger and more durable than natural
fiber ropes. They are generally not affected by rot, mildew or most
chemicals and may be stored wet or dry. The service life of
synthetic exceeds that of natural fiber ropes and have proven to be
more efficient and cost effective.
NYLON - The strongest rope we supply. Nylons elasticity can absorb
shock loads that would break ropes of other fibers. Resistant to
abrasion, rot, petroleum products, marine growth and most
chemicals, nylon rope will last many times longer than natural
fiber ropes. When wet, nylon rope has approximately 15% less
strength and this should be considered when selecting nylon rope.
POLYESTER - has less stretch and elasticity than nylon plus greater
resistance to ultraviolet degradation from sunlight. Other
characteristics of the two fibers are practically the same.
POLYPROPYLENE - Extensively used for many applications,
polypropylene is a strong, lightweight, floating rope. Resistant to
rot, mildew, petroleum products and most chemicals, polypropylene
is an excellent all purpose utility rope.
Rope Use and Care:
OVERLOADING - Avoid sudden strain. When a working load has been used to select a
rope, the load must be handled slowly and smoothly to minimize
dynamic effects and avoid exceeding the provision for them.
ABRASION - All rope will be severely damaged if subjected to rough surfaces
or sharp edges. Chocks, winches, drums and other surfaces must be
kept in good condition and free of