History
BoPET film was developed in the mid-1950s, originally by DuPont and Imperial Chemical Industries (ICI). In 1964, NASA launched Echo II (the second mission of Project Echo). It was a 40 metres (131 ft) diameter balloon constructed from "a 0.35mil (9µm) thick mylar film sandwiched between two layers of 0.18 mil (4.5µm) thick aluminum foil and bonded together."
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