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2. Anti-scratch coating - Wikipedia

   en.wikipedia.org/wiki/Anti-scratch_coating

   Scratch-resistant coatings are added to glasses due to scratches' extreme ability to impact a wearer's vision. Even when optical glasses are made of high scratch-resistances glass, polycarbonate, or CR-39, coatings are still used. Optical coatings include diamond-like carbon (DLC) and anti-reflective-scratch hybrid coatings. Diamond-like Carbon ...

3. Chemically strengthened glass - Wikipedia

   en.wikipedia.org/wiki/Chemically_strengthened_glass

   Since phones are commonly carried in a pocket or purse with items such as keys, scratch resistance is important. There also exists a more advanced two-stage process for making chemically strengthened glass, in which the glass article is first immersed in a sodium nitrate bath at 450 °C (842 °F), which enriches the surface with sodium ions.

4. Bulletproof glass - Wikipedia

   en.wikipedia.org/wiki/Bulletproof_glass

   Bulletproof glass of a jeweler's window after a burglary attempt. The Mona Lisa behind bulletproof glass at the Louvre Museum. Bulletproof glass, ballistic glass, transparent armor, or bullet-resistant glass is a strong and optically transparent material that is particularly resistant to penetration by projectiles, although, like any other material, it is not completely impenetrable.

5. Gorilla Glass - Wikipedia

   en.wikipedia.org/wiki/Gorilla_Glass

   A Nokia N8 with a Gorilla Glass screen. Gorilla Glass, developed and manufactured by Corning, is a brand of chemically strengthened glass now in its ninth generation. Designed to be thin, light, and damage-resistant, its surface strength and crack-resistance are achieved through immersion in a hot potassium-salt ion-exchange bath.

6. Tempered glass - Wikipedia

   en.wikipedia.org/wiki/Tempered_glass

   A vandalised telephone booth made with tempered glass. Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass.

7. Unbreakable glass - Wikipedia

   en.wikipedia.org/wiki/Unbreakable_glass

   Unbreakable glass is glass, or glass substitute, which does not display the normal fragility of glass – in general the term is not used to refer to something that ...