One-Piece Sapphire Crystal Watch Case And Top Glass For 6497
Movement
Watches with precious metal cases will also show a high level of
collection significance and sales value if they are equipped with
complex functional centers. But there are always exceptions, there
is an emerging material in the bezel, it is not precious metal, but
precious properties than precious metals have been unprecedented,
and amazingly, this material of advanced complex table is often
valuable, from the recent products, we will find that the price of
such watches sometimes far greater than precious metal watches.
What kind of material is so sought after? It's neither ceramics nor
highly visible technology materials such as carbon fiber, but
sapphire crystal glass that we've known in the past to make watch
mirrors or transparent bottom covers.
Sapphire is one of the world's hardest materials, sapphire Mohs
hardness is 9, the entire process of making a sapphire case is very
complex, highly technical, long production cycle. temperature to
continue the subsequent analysis process.
Sapphire is one of the hardest materials in the world. Diamonds are
the first hard in the world and sapphires are second. Diamond Mohs
Hardness 10, Sapphire Mohs Hardness is 9. The average stainless
steel is 5.5, titanium is 6, and gold is 2.5 to 3. Richard Mille
056, a transparent sapphire case, manufactures a sapphire case that
lasts more than 1,000 hours, or more than a month. Pre-press
molding like sapphire takes 430 hours, polishing takes 350 hours,
etc.
| 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
|
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.
