|Material:||Sapphire||Shape:||Available Upon Request|
|Surface Quality:||60/40;40/20||Thickness:||As Request|
|Color:||Transperant,colorless||Usage:||Wrist Watch And Smartwatch Glass|
sapphire optical window,
sapphire coated glass
High Quality Guangzhou Single Dome Sapphire Crystal Watch Glass
Window Materials for High-class watches
Features of Keeppromise’s Sapphire:
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 .
Hardness is second only to diamonds
Much stronger than other optical materials (65,000 modulus of rupture)
Extremely hard surface
High scratch resistance and wear.
Very wide optical transmission band from UV to Mid IR
Extremely high melting point
High electrical resistance
Chemical properties of stability
High thermal conductivity for a non-conductor, even better than copper at cryogenic temperatures
High dielectric constant
Synthetic Sapphire Window Technique Index :
|Edge Finish||Ground and beveled|
|Surface Quality||40-20 scratch-dig|
|Parallelism||≤3 arc min (≤0.9 mrad)|
|Clear Aperture||>80% of central diameter|
|Hardness (Knoop)||1370 kg mm-2|
|Young's modulus||3.4 x 1011 N m-2|
|Thermal Limit||22 W m-1 K-1|
|Thermal expansion coefficient||8.4 x 10-6 K-1|