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Broken Rope

TonyB

8-May-2012
8:39:24 PM

This paper shows there's a long list of agents that attack nylon
http://www.newmantools.com/pipestoppers/NYLON_chem_resistance_nt.pdf
It shows "strong attack" from "metallic salts" (unspecified); "solvents" (unspecified); H2S (farts); and even a "moderate effect" from lactic acid (sweat) and "partially dissolves" in dilute formic acid (ants) !


Cool Hand Lock

13-May-2012
10:34:17 AM

On 27/04/2012 patto wrote:
>Acid. My bet is acid.

The answer could be more basic than that.

patto

13-May-2012
11:54:14 AM

On 8/05/2012 TonyB wrote:
>This paper shows there's a long list of agents that attack nylon
> http://www.newmantools.com/pipestoppers/NYLON_chem_resistance_nt.pdf
>It shows "strong attack" from "metallic salts" (unspecified); "solvents"
>(unspecified); H2S (farts); and even a "moderate effect" from lactic acid
>(sweat) and "partially dissolves" in dilute formic acid (ants) !

There is absolutely minimal lactic acid in sweat. I'd be more worried about coke and vinegar.


ajfclark

13-May-2012
8:20:12 PM

And urine... There's a QC with KP about urine and ropes somewhere... [here: http://www.blackdiamondequipment.com/en-us/journal/climb/all/qc-with-kp-from-the-archives-1#ropepee ]

TonyB

13-May-2012
8:48:12 PM

On 28/04/2012 JamesMc wrote:
>Or insect repellant? DEET comes from the family of chemicals that are used
>to soften plastics like vinyl.

This article claims DEET has no effect, but its solvent may attack rope
http://www.canyoneering.net/forums/showthread.php?670-DEET-doesn-t-weaken-nylon-polyester-or-Spectra
This also mentions "solvents" as having a "strong attack"
http://www.newmantools.com/pipestoppers/NYLON_chem_resistance_nt.pdf
Perhaps solvents in sunscreen might have a similar effect. Hydrocarbon solvents have no effect.

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