Im going to be re-furbishing a piece of soapstone, I will be sanding it then oiling it then setting it ontop of my coal stove Is there any differences anyone knows about type of mineral oil or what oil might be best suited for this job?
I'm not sure where the smoke point of light mineral oil occurs, but I know its flash point is only around 335 degrees F., so on first guess I would assume the smoke point to come in at somewhere before that juncture. The flash point of peanut oil is at or slightly above 550 degrees F.
It turns out that (per Wikipedia) the smoke point of any given oil is appreciably below its flash point. For peanut oil the smoke point is 450 degrees, which is 100 degrees below its lowest listed flash point.
There are actually a broad range of mineral oils ranging form light to heavy, and the heavier ones tend to have increasingly higher flash points, so presumably higher smoke points as well. Mineral oil is a byproduct of the refining of crude oil.