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New England MFP Throwline 5/16" |
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| Size | Weight | Tensile | ||
|---|---|---|---|---|
| lbs/100' | g/m | lbs | kg | |
| 5/16 8mm | 1.8 | 27.1 | 1,600 | 726 |
Sunlight/UV:
Very little degradation from sunlight. Can be used outside over long
term if inspected regularly.
Chemicals:
Polypropylene has excellent resistance to most acids and alkalines,
except chlorosulphonic, concentrated sulfuric acids, and chlorinated
hydrocarbons at 160°F. Polypropylene also withstands most diluted
bleaching solutions.
Heat:
Polypropylene melts at 330°F with progressive strength loss above
200°F.
Dielectrics:
Good resistance to the passage of electrical current. However, dirt,
surface contaminants, water entrapment, and the like can
significantly affect dielectric properties. Extreme caution should
be exercised any time a rope is in the proximity of live circuits.
Sheaves:
Recommended sheave diameter to rope diameter is 8:1.
Working Loads:
No blanket safe working load (SWL) recommendations can be made for
any line because SWL's must be calculated based on application,
conditions of use, and potential danger to personnel among other
considerations. It is recommended that the end user establish
working loads and safety factors based on best practices established
by the end user's industry; by professional judgment and personal
experience; and after thorough assessment of all risks. The SWL 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 is involved, or in cases of exceptional service such as
shock loading, sustained loading, severe vibration, etc. The Cordage
Institute specifies that the SWL of a rope shall be determined by
dividing the Minimum Tensile Strength of the rope by a safety
factor. The safety factor ranges from 5 to 12 for non-critical uses
and is typically set at 15 for life lines.