Nippon Electric Glass (NEG) has revealed new details about Dinorex UTG, its ultra-thin glass designed for foldable smartphone displays. The company claims the material has endured up to 1 million bend cycles without damage during internal tests and officially passed certification for 200,000 folds. Dinorex UTG is no longer just a lab experiment; it’s already inside the screens of several Motorola Razr models and the Xiaomi MIX Flip 2 foldable phones.
Unlike traditional protective glass, Dinorex UTG is engineered specifically for the flexible inner display of foldable smartphones. NEG has produced regular Dinorex glass for conventional smartphones for years, but the UTG variant is tailored to withstand the continuous bending that foldables require. The glass is manufactured using an overflow process adapted from LCD and OLED panel glass production, with potassium ion exchange enhancing its strength and durability.
- Minimum bending radius: 1.5 mm
- Bend diameter: up to 3 mm
- Official certification: 200,000 fold cycles
- NEG internal testing: 1 million fold cycles
- Destructive tensile strength: over 1,500 MPa
To put that certification into real-world terms, 200,000 folds equate to roughly 100 opens and closes daily over five and a half years. Longevity remains a top concern for foldable smartphone users, who often worry about both the durability of the screen and the hinge mechanism. Industry data from Counterpoint Research highlights durability as a key factor slowing the global foldable smartphone market’s growth, which is projected to underperform the broader premium smartphone segment in 2025 amid consumer skepticism.
Dinorex UTG is currently featured in the Motorola Razr 50 and Razr 60 series, as well as the inner display of the upcoming Motorola Razr Fold 2026 model. The Xiaomi MIX Flip 2 also uses this glass, and HONOR is reportedly working with NEG, though specific models haven’t been disclosed. Meanwhile, the external display of the Razr Fold uses tougher Corning Gorilla Glass Ceramic 3-typical foldable design places flexible ultra-thin glass inside with more rigid protective glass outside.
It’s important not to confuse Dinorex UTG with ”Samsung’s glass.” UTG is a generic term for ultra-thin glass used in foldable panels, not a trademark. Samsung’s Galaxy Z Fold and Z Flip employ different suppliers like Schott and Corning. NEG’s entry into the space marks a clear push by a Japanese player to carve out a foothold in a market long dominated by American and European glassmakers.
For Motorola and Xiaomi, adopting NEG’s Dinorex UTG also means diversifying their supply chains beyond a few dominant panel and glass providers. Should NEG ramp up volume supply in 2026, competition in the ultra-thin glass sector will intensify, likely forcing prices down and expanding design choices-good news for foldable smartphone innovation and affordability.