I guess that's just it. If it's kosher to soak/clean KISS carts, and the hercules, what's the material in the standard carts that can't handle ISO? I thought it was constructed of the same materials, so what's the difference?
Repeating myself, "because materials used (typically seals) aren't up to it". ISO attacks the seals typically causing leaks.
You are incorrect in your assumption. There are several changes. In addition to going to materials that allow ISO there is no use of glass fibers any more and the heating element is no longer exposed. All very significant changes. Details matter here. Assumptions lead to trouble often.
I agree, following the instructions is always good advice, but I've always been the type to only follow rules that make sense to me. If what's in the standard cartridges isn't stable enough for a soak in alcohol, I have doubts it's stable enough for me to heat and inhale vapors from either.
I hope I didn't give that impression, because I certainly don't agree with you. IMO y
ou should follow instructions especially when you don't understand them or they 'don't make sense to you'. That's the whole idea, really. If it made sense to everyone, there'd be no need for rules and guidelines. I hope others aren't following your lead here, IMO it's a very dangerous practice. Rather I suggest following the advice of the maker until you know better.
It has noting to do with stability. Or material safety, really. Used as directed they are widely held to be 'plenty safe'. Styrofoam cups are just fine for drinking coffee, but a single drop of acetone makes a mess. Same deal IMO.
OF