CNES says, the stratospheric drone structure has been designed to be placed under stratospheric balloons for validation tests. Consequently, CNES had to test the part in different environments, simulating conditions with thin to no atmosphere, to ensure suitability for extreme conditions.

During the prototype testing process, the design was qualified by mechanical engineers at CNES. While in the same test, the material ULTEMTM 9085 was also qualified, confirming its compatibility inside vacuum chambers without outgassing, a crucial element for maintaining an ideal optic performance.