From what I recall the manufacturer claims you can ADD boiling water to a Platy, not boil IN the Platy. Be careful.
That said, you can (I have tried it for kicks and it worked)boil water in virtually any container, including plastic, paper, or a big leaf. I'm no scientist, but the water takes most of the heat that passes thru the container, so the container doesn't burn up until the water is gone.
I wouldn't do this to a Platy of mine, though. My 2cents.