Read my post above. Slightly below the boiling point of water pure Nicotine will explode in a sealed bottle. If you heat it, nicotine will decompose chemically before it boils. 120f - 125f (48C) is a good recommendation.
Hi Danny, You really seem to know a lot about dyi mixing and I hope to get some advice in the near future when I get started myself. So please take the following lightly
Unless I'm way off on my conversions I think your comment above about exploding is a bit off. The boiling point of Nic is 247C which is 476.6F, the autoignition point is 240C/464F. Now the flash point of 95C/203F is just below the boiling point of water at 100C/212F but to flash ignite there needs to be an ignition source. In a sealed bottle at 95C it would have to compromise the seal and have an ignition source to burn but not explode.
Autoignition on the other hand does not need an ignition source that is completely temp dependent. So the Nic would have to be sealed container that can withstand temps above 240C to explode.
That and all of this, like you said, is also concerning pure nicotine. Not diluted at the levels we are using. An open bottle at 95C would start venting larger amounts of nic to the air though. And I don't know how much 10% liquid (let alone anything under 3.6%) it would take over time to reach 0.7 - 4 percent, by volume, in air Vapor Pressure at Room Temperature: 0.006 kPa.
I hope this removes the fear of temps getting a little higher in an unattended USC.

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