No way I’m going to rehash all this over again here, but there are answers, it’s just an enormously long thread to find them in, maybe you can Search it,
There’s a simple method for testing any solvent for non-volatile residue (mystery oil,) it’s right there at the first page. Later in the thread you’ll find where I posted up the entire ASTM non-volatile residue testing procedures for LPG, my method is simpler and more accurate, and like I said, can be used with any solvent.
The very first lot of Puretane was was clean, and they never got back to that standard while I was still testing. Capitol also couldn’t keep up with quality control, if it’s the same vendor I’d test each lot you got in.
In the thread you’ll also learn the so called third party purity analysis test results posted up by tank vendors doesn’t actually include non-volatile residue test results, obfuscation would be a kind way of putting it, this goes for Ecogreen, X-tane, Refined Hydrocarbon Solutions (the USA grade at BVV,) etc. A NV residue test was done way up the chain, but you’ll never see it, why is also in the thread.
Generally speaking all the canned butane refills fall within a region of non-volatile residue purity that Gray Wolf and I agreed was ok, none was totally shit, but some were way better than most.
I requested Sean at Ecogreen repeatedly to do my test on each lot that came in, and hoped this would be the standard to make sure garbage didn’t get sold, never happened. I tried, I really tried. For a small fee and traveling expenses I’d be glad to go to the tank vendors and show them how easy it is to do the test, and if they still didn’t want to do it themselves, I suppose I could travel around and do it for them as the gas came in. But you’d better catch me soon I’m broke and going homeless. Another service I could be performing is showing extractors how to test their solvents, the test will also show if you have moisture contamination the filter isn’t catching, traveling around and certifying solvent quality would be an enjoyable occupation, kinda ding dong in that you guys could be doing it for yourselves, but you could then claim someone known to the community was doing the checking.
If someone who knows the players and would like to set me up with them I’m available, even if it’s just for free consultations.