The Samsung Galaxy Z Flip has received much criticism owing to its highly fragile display. While durability tests do not show any indications of the display being made of glass, a closer examination does confirm the company's claims of using ultra-thin glass under a protective plastic layer. However, Samsung's marketing gives the impression that the Galaxy Z Flip's glass display is as reliable and scratch-proof as any other smartphone.
https://www.notebookcheck.net/Samsung-s-claim-of-the-Galaxy-Z-Flip-using-a-glass-display-is-potentially-misleading-but-is-not-false.454097.0.html