Ahead of Samsung Electronics’ unpacking event, interest in the foldable phone cover window material is hot. There was a concerned surprise that the Galaxy Fold, which was scheduled to be released in the first half of last year, was delayed for several months due to the tearing issue of the protective film. This year’s concern is whether Ultrathin Glass (UTG), which has emerged as a substitute for Colorless Polyimide (CPI), can be mass-produced without major issues.