Ultra-thin Glass for Chemical Strengthening: Dinorex UTG™

Bendable glass, ideal for foldable devices

This glass has been developed for cover glass for foldable displays. It boasts excellent bending properties due to its high surface smoothness and uniform thickness, and can withstand bending with a diameter as small as 3mm (R1.5).

Applications
Features
Unparalleled Foldability
Mechanism of High Impact Resistance
Event Information

Applications

Cover glass for foldable displays

Features

Excellent surface smoothness
Extremely smooth, with high surface smoothness even without polishing.
Uniform thickness
Consistently uniform thickness even without polishing.
Excellent bending properties
Withstands bending with a diameter of 3mm (R1.5).

Unparalleled Foldability

Superior surface quality, uniform thickness distribution, chemical strengthening, and scratch elimination result in breaking stresses exceeding 1500MPa. This enables unparalleled foldability.

Mechanism of High Impact Resistance

When glass containing sodium ions (Na⁺) is immersed in a potassium nitrate solution containing potassium ions (K⁺), the Na⁺ on the surface of the glass are replaced by K⁺, which have a larger diameter. This process, known as "ion exchange," creates compressive stress on the surface of the glass. This compressive stress enhances the toughness of the glass, making it so resistant that it cannot be broken even when struck with a hammer, for example.

What is compressive stress?
When K⁺ ions, which have a larger diameter, replace Na⁺ ions with a smaller diameter and enter the surface of the glass, the glass naturally becomes "jammed." This causes the volume of the glass surface to attempt to expand. However, since the overall volume of the glass does not change, a force is generated that compresses the surface in the opposite direction. This is known as "compressive stress." Even if tensile stress is applied to widen a crack on the glass surface, this compressive stress counteracts it, making it difficult for the crack to propagate. As a result, the glass becomes more resistant to cracking.