The 38mm and 42mm glass display covers were provided to Unbox Therapy by Sonny Dickson, who has obtained authentic Apple parts in the past.
Ion-X glass is the same material used in the windows of space shuttles and high-speed trains. This glass is thin and light, yet surprisingly strong — five times stronger than regular glass. There are many ways to strengthen glass at the surface, but Ion-X glass is hardened down to its molecules. During the manufacturing process, the glass is dipped in a 750-degree molten potassium salt bath. That’s when ion exchange takes place, with the smaller sodium ions being removed from the glass and replaced by larger potassium ions. As the glass cools, these larger ions create an extremely hard surface layer that is resistant to scratches and impact.
The scratch resistance of the display glass is tested using a key, a knife, steel wool, and two types of sand paper.
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