The unique composition of Corning Gorilla Glass allows for a deep layer of high compressive stress (created through an ion-exchange process). This compression acts as a sort of "armor," making the glass exceptionally tough and durable.
Ion exchange is a chemical strengthening process where large ions are "packed" into the glass surface, creating a state of compression. Corning Gorilla Glass is specially designed to maximize this behavior.
The glass is placed in a hot bath of molten salt at a temperature of approximately 400°C. Smaller sodium ions leave the glass, and larger potassium ions from the salt bath replace them. These larger ions take up more room and are pressed together when the glass cools, producing a layer of compressive stress on the surface of the glass. The special composition of Gorilla Glass enables the potassium ions to diffuse far into the surface, creating high compressive stress deep into the glass. This layer of compression creates a surface that is more resistant to damage from everyday use.Step One: Smaller Sodium ions (NA) are exchanged for larger Potassium ions (K).
Step Two: Larger Potassium ions (K) near the glass surface create compression on the surface. Glass only breaks under tensile stress. If the glass surface is in compression, it is able to withstand more impact before breaking.
Yes, Gorilla Glass can break. However, Gorilla Glass is better able to survive the real-world events that most commonly cause glass to chip or break because of its special composition and chemical strengthening.
Gorilla Glass is tough, yet beautiful. Take a look: