25mm Sapphire Crystal Watch Case , Domed Sapphire Watch Crystal

Description



Sapphire is scaled at Mohs hardness 9, the hardest next to diamond .

It has the excellent endurance and eternal btilliance and transparency .

This is why it has become intimate as the window materials of wristwatches with
so many custoners all over the world .



Specification



Material Aluminum Oxide (Al2O3)
Length(mm) 2.0~200.0 Tolerance 0.03~0.1
Width(mm) 2.0~200.0 Tolerance 0.03~0.1
Thickness 0.1~25.0 Tolerance ±0.03
Surface Roughness ≤0.5nm
Infrared ray Transmission > 85%(@633nm)

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