I think it is appropriate Vaporer, it all ties together well. The testing was done with Propylene Glycol, temps of VG and PG would vary, however it was tested for acrolein in the mist, not in chamber with bisulfates. So one could assume this is an area that needs more clarification. Gotta do some more looking, the Ruyan testing did touch on the things tested for, but only under limited conditions as far as number of puffs, and the mist was also on a full cart. For example, running low on e-liquid, dry atty, high power, etc.
NOTE TO SELF: ask somebody!!
Thanks for posting this Kate. It looks like the Ruyan juice was PG, with no VG. Thus no acrolein found.
Vaporer, I also think this is very related, since it is a high-heat/toxicity issue. So I for one am glad we are discussing it.
Acrolein is a strong lacromator, meaning it would take ng quantities to get a mucus membrane response (itch, burn, runny, sneeze, tearing of eyes). I've worked with acrolein, since is is a common synthesis starting material. Just putting a beaker of it at room temp under the nose will set off major "allergic" response. I've gotten ZERO response like that to VG based juices, and I have a very sensitive nose. On the other hand, I am certainly not alone in my somewhat aversion to PG, since it can produce runny nose and headaches for me, as it does with many others. VG, OTOH has a much better track record for lack of allergic responses.
Also, we are not dealing with pure VG, but rather a mixture that has perhaps a little PG, water, flavorings, etc. The vaporization temp could be FAR lower than the BP of pure VG.
Some of my 510 attys glow orange, some do not glow at all. All vape fine.
Acrolein formation from VG requires oxidation, not just dehydration decomposition. Something has to take electrons. Combustion (rxn with O2) would do it, but vaping is not combustion, nor is there anything that would act as an oxidizer present in an atty.
In addition, TW gives the lab report on their 36 mg PG/VG unflavored juice, which has to be vaporized and bombarded (oxidized) with high energy electrons. No acrolein was detected.
Thus empirically I would have to say that acrolein is not being produced. A simple thing would be to analyze the mist of a VG juice, like the chinese did with the PG juice. Until then, we don't really know for sure. But I am leaning strongly towards the opinion that acrolein not being produced with a normal 510 atty and VG juice. Of course, this is OPINION, not necessarily fact. Still looking for more clues.
Besides looking at metal glow colors, is there anything known about the temperatures of an atty heating element? Is it anywhere near 550 C (BP glycerin)?
I'm going to try to do some digging myself on this.
Kurt