I once had polypropylene prusik slings. They worked fine, although I
used them only once in a real pit (~100 ft), just to show that I
could. About that time, Jumars came out, and I could afford the $18 to
get a pair.
A major problem with polypropylene is its low melting point, 130 to
170 degrees C. You could easily get your brakebars hot enough to melt,
or at least seriously degrade, polypropylene. There may once have been
a fatal accident at Gaping Gill (340 feet) in England for that reason.
The nylon used in caving ropes melts at 265C. -- Mixon
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