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From: (no name) (no email)
Date: Thu Mar 27 2008 - 09:43:59 EDT
Thanks for all the on and off list advice about mixed fiber rope
(nylon/polyester blend).
Coincidentally, yesterday we had a tree service do some repair of winter
damage to a large oak in our yard. After watching two young men swinging from
branch to branch 80 feet above the ground, wielding chain saws, I asked about the
rope that they were using. They informed me that it was a mixed blend of nylon
and polyester. The reasons:
Nylon is a tad stronger than polyester but it has so much stretch under load
that you are never sure where the tool or branch that you are supporting is
going to end up. Polyester, almost as strong, has so little stretch that when
used as a safety rope, the sudden stop is almost as bad as hitting the ground.
Mixed fiber rope is a compromise.
After they left, I went to the Internet and found that they were correct.
Most safety ropes are blends. Nylon stretches 15 to 25% before breaking, and
loses up to 20% of its dry strength when soaked. Polyester stretches less than 3%
and has the same strength wet or dry. The blends offer a compromise, depending
on how much of each fiber is used. This still didn't answer my question of
whether the Home Depot rope on sale is a good buy. I guess I'll have to examine
the label more carefully and see the proportion of fibers. The fact that it is
sold in the lumber department probably means that it is a type suitable for
construction work where stretch should be limited.
To avoid confusion, this isn't the yellow polypropylene floating rope.
Neither nylon nor polyester rope floats.
Larry Z
**************
Create a Home Theater Like the Pros. Watch the video on
AOL Home.
(http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom00030000000001)
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