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Originally Posted by Veselin Kolev
BTW, isnt only the propellant in WD40 really flammable? The oil burns, sure, but it takes a lot of heat. When you're cutting at high rates, it just evaporates, and thats what you want it to do.
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Ever try to unstick a stuck nut and bolt by first spraying it with WD-40, and then when that doesn't work taking a blow torch to it??
No??
Well.. I haven't either, but I have seen it done, and it's not pretty. WD-40 is indeed flammable as a liquid form, and probably as you said even more so when in gas state coming out of the can.
As far as whether or not it will burn while machining, I'm not sure cause I haven't had personal experience with it, but I'm sure if you are milling hard enough and at a slow enough speed and the heat and friction builds up, I'm sure the flash point of the WD-40 could be reached, and it could be ignited.
Just a guess so far though. Anyone want to test this theory in a safe and controlled environment?