Glass for Chemical Strengthening: Dinorex™
Scratch- and impact-resistant glass
Chemically strengthened glass developed for cover glass in portable devices like smartphones and tablets, as well as automotive displays and other emerging uses. It protects displays against scratches and impacts.
Applications
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Smartphone
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Tablet
Features
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Superior chemical strengthening properties
It offers exceptional strength due to its high compressive stress (CS) and deep compressive stress layer (DOL). -
High productivity
Chemical strengthening can be completed quickly, ensuring efficient production. -
High transmittance
Nearly colorless and transparent, it has minimal impact on the color tone and image quality, preserving the clarity and beauty of images and videos.
Reasons for 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 layer of the glass is replaced by K+ with a larger diameter in the solution (this is called “ion exchange”). This creates a force called compressive stress* on the surface of the glass, which makes the glass so tough that it cannot be broken even when struck with a hammer, for example.
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What is compressive stress?
If K+with a large diameter is replaced by Na+with a small diameter and enters the glass surface layer, the glass will naturally become jammed, and the volume of the glass surface will try to increase. However, since the volume of the glass itself does not change, a force is generated to compress the surface in the opposite direction. This is called “compressive stress.” Even if a force (tensile stress) is applied to widen a crack on the glass surface, this compressive stress cancels it out, making it difficult for the crack to progress, and as a result, the glass is less likely to crack.
