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Design Factor
This term refers to the ratio between the sling's minimum ultimate
breaking strength and the sling's rated capacity.
For all standard, class 7 synthetic slings purchased from Heli-Hoyle,
the rated capacity is based upon a design factor of 1/5th the minimum
ultimate breaking strength of the sling. Therefore, under ideal
conditions, and for a new sling, the minimum breaking strength is 5
times the rated capacity.
Minimum Ultimate Breaking Strength
This is the minimum ultimate load at which any part of a sling breaks
to destruction.
Proof Load Test
Any sling that has undergone repair is subjected to a "Proof
Test" of twice the capacity before being re-certified, labelled and
returned to the customer.
Elongation
This is the measurement of stretch in a sling. Nylon slings stretch
approximately 7 - 11 percent of a sling's length at rated capacity and
polyester approximately half as much as nylon. Elongation varies with
weave type and sling construction.
Temperature
Synthetic slings should not be exposed to temperatures below minus 40
or above + 200. Temperatures in excess of these can severely affect a
sling's rated capacity.
Manufacturing Tolerance
Synthetic slings supplied by Heli-Hoyle are subject to a
tolerance of 3% of a sling's length for single and double ply and 5% of
a sling's length for three and four ply slings.
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