It has been reported that Xiaomi and Huawei have been replenishing their stocks of ultra-thin glass (UTG), creating speculation of what the Chinese OEMs have in mind for the material. The upcoming Huawei Mate 40 Pro will feature an ultra-thin display, and it is possible Xiaomi will use UTG for a Mi Mix 4 smartphone or a Xiaomi Mi foldable device.
https://www.notebookcheck.net/Xiaomi-Mi-Mix-4-vs-Huawei-Mate-40-Pro-Chinese-OEMs-stocking-up-on-ultra-thin-glass-could-indicate-potential-dynamite-flagship-smartphone-or-foldable-rivalry.477079.0.html