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A lab flask shouldn't be much worry on the stove - this is what they are made for. Hot stove to ice water might be a little too much for it though.
There's a product called Ferm-Cap that comes in little 1 oz. dropper bottles. One drop in a 2L flask has kept my starters of that size from foaming out/boiling over. Works well for preventing wort boil overs as well. Some folks have concerns about using it as it is silicone based. I've decided to only use it only as needed which for me ends up being only occasionally in starters boiled in the flask. If I boil in a pot and monitor closely there's no need.
Quote from: Pinski on December 30, 2011, 07:40:56 amThere's a product called Ferm-Cap that comes in little 1 oz. dropper bottles. One drop in a 2L flask has kept my starters of that size from foaming out/boiling over. Works well for preventing wort boil overs as well. Some folks have concerns about using it as it is silicone based. I've decided to only use it only as needed which for me ends up being only occasionally in starters boiled in the flask. If I boil in a pot and monitor closely there's no need.I use this in my starters and in my boil kettle. One or two drops is all you need.