What are the state of the art balloon materials used for high altitudes ascending (top of troposphere, approximately 50 km)?
Are there new material improvements likely in the next future? If so which are likely candidates?
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Standard NASA scientific balloons are constructed of polyethylene film; the same type material used for plastic bags. This material is only 0.002 centimeters (0.0008 inches) thick, about the same as an ordinary sandwich wrap.