Epoxy exposure to webbing and rope

That must be some sort of typo. We use nylon equipment all the time making beer.

Marc801 wrote:Lee Green wrote: Beer rates a D on nylon? Yikes. Wait. I read it as D as well (which makes no sense)

Well the link posted above says A- Excellent. This link says the same thing:

coleparmer.com/Chemical-Res…

I suspect you could suck Everclear shots out of your rope and it wouldent matter much.

20 kN wrote: Well the link posted above says A- Excellent.

Look at my image posted above. That comes from the Little Giant chemical pump resistance chart PDF in that link you reference, so I don't see where you're reading A- Excellent.

The link you provided from Cole-Parmer does show it correctly as A- Excellent.

Marc801 wrote: Look at my image posted above. That comes from the Little Giant chemical pump resistance chart PDF in that link you reference, so I don't see where you're reading A- Excellent. The link you provided from Cole-Parmer does show it correctly as A- Excellent.

Hopefully the chart's D is just a typo, but the devil is in the details. Cole-Parmer is very careful to state that their data are for 48 hrs exposure only and can't be extrapolated beyond that, whereas Little Giant is talking about materials used for parts in chemical pumps. Those are exposed to the solutions they're pumping for very long durations.

Beer's pH is typically in the 3.x range, acidic enough that it may be no problem in 48 hrs exposure but leave it on there a few weeks and it could be a different story. So I guess if I spill my IPA on my rope I'll be washing it off promptly. Goes double for soft drinks, many of which are much more acidic than beer.

I could easily see where painting an epoxy or hardener, or beer, or Coke, on nylon rope then pull testing it might yield very different results if it's done immediately vs. after being allowed to sit in warm humid conditions for a few weeks. And might yield different results if it's linear pull vs. being loaded around a small radius (like a carabiner). That's why we need materials science engineers. They think of these things.