Synthetic Sapphire Crystal Watch Case With Advanced Optical Properties
Sapphire—a material that is almost as hard as diamond—has been used in watches for years as the crystals over the dials (in part due to being extremely scratch-resistant). It’s not the easiest material to work with, due to its extreme toughness. It can be difficult to cut and mold, but boundaries are pushing by cutting blocks of it into unique and fun shapes.Everything from traditional round cases to tonneau, square, and even wildly unexpected shapes that resemble car engines or jets.
The main features of this method are:
1) In the process of crystal growth, it is convenient to observe the growth of crystals;
2) The crystal grows on the free liquid surface, is not forced by the crucible, can reduce the stress of the crystal;
3) It can be easily used to use the desired orientation seed crystal and "shrink neck" process, which helps to grow higher quality crystals at a relatively fast rate, and the crystal integrity is better;
4) The forced convection and natural convection interaction caused by the rotation of crystals and crucibles make the complex fluid flow action insurmountable and prone to crystal defects;
5) Mechanical disturbances tend to cause defects in the growth of large diameter crystals.
| Property | Specifications |
| Thickness | 0.5-200mm |
| Size Tolerance | ±0.01 |
| Edge Finish | Ground and beveled |
| Surface Quality | 40-20 scratch-dig |
| Surface Flatness | λ/4@633nm |
| Parallelism | ≤3 arc min(≤0.9mrad) |
| Clear Aperture | ＞80% of central diameter |
| Hardness(Knoop) | 1370 kg/mm2 |
| Young's modulus | 3.4*1011N/m2 |
| Thermal Limit | 22W/m/K |
| Thermal expansion coefficient | 8.4*10-6/K
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FATURES
1. High mechanical strength: the permeable infrared window material should have sufficient strength to withstand the high-speed movement of the speed pressure load;
2. Good thermal stability: the permeable infrared window material should be able to withstand the temperature shock caused by pneumatic heating and height changes, transmission ratio and refractive index should not change significantly with the change of temperature;
3. Good chemical stability: through infrared window material exposed to air, should be able to prevent the atmospheric salt solution or corrosion gas corrosion, and not easy to moisture;
4. High optical transmission rate, must be able to effectively transmit ultraviolet to medium infrared radiation;
5. Good optical characteristics, small optical scattering and good uniformity of refractive index;
Meets large window requirements.
Why US?
1. We’re the rare source manufacturer of color sapphire boule, and the most professional factory of sapphire processing, especially the special watch case.
2. We have our own sapphire grown equipent with CZ and KY method.
3. Professional customized production according to the drawing provided by clients.
4. Precision work of sapphire processing and polishing.
5. Experienced technicians and skilled workers.
FQA
1. Are you a trading company or factory?
We are a professional factory of sapphire products, also a trading company .
2. Can you do customized products?
Yes, we specialized in customized production or OEM work.
CAD,3D drawing are needed.
3. Could you provide samples?
Yes, we could provide samples with a charge, but if you place the order with a quality above 100pcs, the sample charge will be refunded.
4. What’s the delivery time?
It depends on the type of products and the quality.
For watch case, the regular time is around 5-8 weeks for 200pcs according to the difficulty of the processing.
5. How about the payment?
T/T payment is prefered.
6. How about the delivery?
Mostly by air, like DHL, Fedex.
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