An in-depth look at Samsung's Ultra Thin Glass, used on the Galaxy Z Flip: how its thinness allows it to fold but requires a plastic protective layer
and yet why folding glass isn't entirely ready. https://twitter.com/... Nilay Patel / @reckless : The Galaxy Z Flip does have a folding glass screen — as @StarFire2258 reports in this deep dive into the tech, it's made by a German company called Schott. It also has.... problems. https://www.theverge.com/... Mike Murphy / @mcwm : Really interesting story from @StarFire2258 on how we have foldable glass at all Kinda feels like we're in the very early days here, like we were for the first Gorilla Glass on the first iPhone — things need time to get better https://www.theverge.com/...
Context & Ripple Effects
The deep dive lands between two data points the related coverage already established: Samsung's January tease of Ultra Thin Glass under a Dynamic AMOLED display in the then-unannounced Z Flip, and tests published two days earlier showing the glass performs no better than plastic against damage, with Samsung offering a one-time $119 screen replacement. The piece explains why: Schott's German-made glass is thin enough to fold only because a plastic protective layer sits on top — and that layer is what scratches.
First-order effects
- Galaxy Z Flip buyers get a screen marketed as folding glass whose everyday scratch behavior matches plastic, with Samsung's one-time $119 replacement as the safety net for early damage.
- Schott gains a marquee reference design as the first foldable-glass supplier in a shipping phone, while The Verge's own Z Flip review confirms the plastic covering scratches easily despite the best hinge yet on a folding phone.
Second-order effects
- Corning's parallel effort to make truly bendable ultra-thin glass — reported while Samsung and others were still shipping polymer screens — now has a competitive benchmark to beat, since Schott's version ships with a compromise layer.
- Rival foldable makers can no longer lean on 'glass' as a differentiator without matching the same plastic-on-top tradeoff, pushing competition toward hinge design and replacement policies instead.
Third-order effects
- If the pattern holds across generations — the Z Flip3 review still flags unknown long-term durability, and Samsung is still selling $1,200+ Flips into 2026 — cover-material science, not the fold itself, remains the gate on foldables going mainstream, making suppliers like Schott and Corning strategic chokepoints rather than commodity vendors.
The trend: Foldable phones are maturing generation by generation, but their pace is set by cover-glass material science, where Schott's first shipping product still needs a plastic layer to survive the fold.