After performing an initial post-shipping inspection of the Fine Guidance Sensor/Near InfraRed Imager and Slitless Spectrograph (FGS/NIRISS) in a clean room at NASA's Goddard Space Flight Center in 2012, engineers from COM DEV (the Canadian Space Agency's prime contractor for the James Webb Space Telescope), and from NASA, place a protective drape over the instrument, until work resumes on the next day. The drape is made out of a material called llumalloy, and it is for contamination protection.
