High hardness and uniformity sapphire crystal watch glass replacement

The watch glass is one of important components of the watch. After development, it has become wear-resistant and scratch-resistant. Today, sapphire glass watch becomes more and more popular. .

The main component of the sapphire glass is aluminum oxide, which removes impurities such as iron oxide and titanium oxide. Chemically, there is no difference between synthetic sapphire and natural crystal. Compared with plexiglass and mineral glass, the sapphire glass has a hardness of 9 grades and is not easily reflective and scratched.

Chemical resistance – sapphire is highly inert and resistant to attack in most process environments.Mechanical properties – High Strength – with strength and stiffness 6 times higher than quartz, combined with excellent wear and scratch resistance – sapphire becomes the high performance choice.

Optical properties – with transmission from 200 to over 3500 nm, sapphire is used in applications spanning from UV to visible to short wave infra red (SWIR). 

Thermal properties – usable to temperatures near 2000 C.

Electrical properties – Sapphire provide a high, stable dielectric constant with the electrical insulation required for electronic substrates, RF and microwave transmitting windows and tubes.

Surface properties – with high hardness and uniformity sapphire can be polished to very tight flatness levels 1/10th and eve 1/20th wave flatness and Angstrom level surface finishes.

Wear properties – high strength and chemical durability combine to enable the production of dimensionally and optically stable components for long life use.

Sapphire is a widely used material that has various properties, such as scratch resistance, impact resistance and flexibility. Sapphire stone has long been used to make protective glass covers and filter glass for watch protection glass or camera lenses, and it is now increasingly used to make mobile phone screens.