Hector

Thanks for the reply John, perhaps a better way of asking my question would be: Will harmful substances leak from a balloon when heated, assuming it doesn't melt first, and what are said harmful substances, and even better what are their effects on the human body if inhaled?

Theoretically and practically speaking. Would there be danger involved in heating air inside a balloon, to say 200°C or more, and then inhaling the expanded contents? I'm referring only to harmful substences leaking from the rubber/whatever else party balloons are made of.