The prepreg (uncured epoxy matrix E201 impregnated by carbon fibbers) has been cured in stratospheric flight at 28 km altitude. Project of University of Sydney, Perm State University and Netwind.ru under support of RFBR. Bending test results of flight and Earth samples are shown:
This is second successful flight experiment, where the prepreg with liquid epoxy matrix was sent to stratosphere and cured there completely. The results will be published soon.