For many smartphone users, applying a screen protector is an immediate priority after purchasing a new device. While this simple accessory offers affordable defense against scratches for traditional phones, the technology behind foldable displays presents unique challenges. Most foldable devices feature two distinct screens, with the inner display utilizing flexible materials that differ significantly from standard rigid glass.
The consensus among manufacturers is that while applying a protector to the outer screen is generally safe, users should avoid covering the inner display. The inner screen is constructed from multiple flexible layers designed to withstand hundreds of thousands of folds. To safeguard these layers, devices like Samsung’s Galaxy Z Fold8 and Apple’s recently unveiled iPhone Duo come with a factory-installed protector. On Samsung devices, this layer is made of flexible thermoplastic polyurethane (TPU), while the iPhone Duo features a protector with a nano-texture coating that provides a matte finish and helps minimize the visibility of the hinge crease.
Historical precedent reinforces the importance of leaving the inner screen untouched. When Samsung first launched the original Galaxy Fold, several users attempted to peel off the built-in protective layer, resulting in immediate display malfunctions. Both Samsung and Apple now explicitly warn against removal and offer authorized replacements through their repair networks. Although some third-party brands market ultra-thin films for inner displays, manufacturers caution that applying unofficial protectors can cause permanent damage to the entire screen.
In contrast, the outer screen of a foldable phone operates like that of a conventional smartphone, typically shielded by chemically strengthened glass such as Gorilla Glass or Apple’s Ceramic Shield. Users are free to apply standard screen protectors to this exterior panel for additional peace of mind.
However, dust poses a greater threat to foldable longevity than surface scratches. While modern devices boast impressive ingress protection ratings—such as the IP48 certification on the latest Galaxy Z Fold models or the IP68 rating on the iPhone Duo—the seals are not permanent, and the hinge mechanism remains vulnerable to fine particulates. To maximize durability, experts recommend using cases that cover the hinge and adhering to general smartphone maintenance best practices rather than risking the inner display with aftermarket films.
Just leave the outer screen alone too. They scratch eventually, but the inner one is far too expensive to break.
I still find it hard to believe manufacturers want us to buy $1,200 phones without reliable third-party screen protectors.
The real enemy here is sand and dust getting into the hinge. That will kill the phone faster than any scratch ever could.
Wait, Apple has a foldable now? The iPhone Duo sounds interesting, especially with that matte nano-texture.
Good advice. I peeled off the inner layer on my old Fold and bricked it immediately. Never again.