A – Axis Sapphire Crystal Watch Case Glass Lens Rough Material OEM Accepted

Window Materials for High-class watches

Features of Xinkehui’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 .

Thickness	0.5-50 mm
Size tolerance	±0.03 mm
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

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

Customized Colorful or White Sapphire Watch Glass

1. OEM Size and Design. Any shape is ok.

2. CE&Rohs Material. Europe, Japan,China, depend on your requirements.

3. We can provide engineer drawing.

4. Printting logo is ok. Camera Lens

5. Fast delivery date.

6. High quality

Our company export some of watch glass to Europe and USA, Japan, Russia……

We can provide the samples to check the quality. The Sample we have available,free charge.