Samsung said that “The glass, while only 30㎛ thick, is produced using an intensifying process to enhance its flexibility and durability. In the process, the UTG is injected with a special material up to an undisclosed depth to achieve a consistent hardness.”
It may be slightly harder than the pure plastic screen of the Galaxy Fold, but as stress tests have shown the UTG in the Z Flip still dents very easily – with just a fingernail, in fact.
Samsung says the UTG layer is sandwiched in between the flexible OLED display and the scratchable plastic layer on the top. In the announcement the company said its UTG “is expected to be adopted by other foldable electronic devices, when demand arises.”
Samsung makes its own phone of course, but subsidiary Samsung Display supplies displays and components to many other rival phone companies, including for Apple’s iPhones.