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The internal temperature will depend on various factors such as the load on the balloon, it's size, and the ambient air temperature. The loading of the balloon will generally be arranged such that the the internal temperature will be around 100C or 212F. If the temperature is taken much higher than this, to say 120C or 250F the fabric will start to degrade.

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i would add that if you need more lift, it is better to have a larger balloon than heating up a smaller one. A larger balloon would not have to be as hot to provide the same amount of lift.
Depending on the type of fabric used to construct the balloon the internal temperature limit will be between 125oC and 150oC / 250oF and 300oF. Nylon fabric balloon have the lower limit, polyester balloons generally have the higher limit.

The above are the flight manual limits. On a typical flight a balloon would be load so that the internal tempewrature was not above 100oC / 212oF

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