He's right bro, google it. BA has a bp of 205 celcius. Seems weird to me too but that's the only answer I could find. That's probably why I've never had success evaporating BA... b/c you can't do it, you'd have to set your oven to a little over 400 degrees, and the rubber stopper might melt at that temp. If the BA is too high, not much you can do but cut it.