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Dia30-50mm transparent Sapphire plate for wrist watch optical glass/ A-axis Sapphire rough plate for wrist watch glass/ Sapphire watch glass/ green/ blue / red / yellow colored sapphire crystal watch glass
Sapphire Glass
Sapphire optical windows are ideal for applications where high pressure, vacuum, or corrosive atmospheres are a consideration. Sapphire, a single crystal form of Al2O3, is resistant to attack by strong acids due to its high dielectric constant. It has high compressive strength and a high melting point. It is also resistant to UV radiation darkening. Our sapphire optical windows are not coated, but a single layer coating of MgF2 on each surface of the window increases the single surface transmittance to 99% throughout the entire visible spectral region. Please note the SAW series sapphire windows are provided in random axis orientation by default and its birefringent nature could affect the polarization state of your application.
A sapphire watch crystal is a watch screen that is fabricated using sapphire crystal. Sapphires are used due to their resistance and toughness as well as their aesthetic appearance.
Sapphire is the second strongest jewel on the Mohs mineral hardness scale, second only to the diamond. The crystal is usually made up of a sapphire-quartz combination. The screens are not completely shatter proof since strength is different than hardness, but it does mean that almost nothing other than diamond is able to scratch the face. This means that those who like to keep their watch faces completely scratch-free often go with this watch crystal.
There are many modern examples of using sapphire crystals as screens in watches and other devices. The Richard Mille watch series, including the Tourbillion, is one such example. Sapphire is tough, but it takes delicate work during machining. Such watches often take 1,000 hours of machining with up to 430 hours pre-forming case components and another 350 just for watch case polishing. Watches with sapphire crystals can often cost between $100 and $300 or more depending on the watch. They are also a common addition to diving watches due to their clearness and toughness despite water pressure of 50 meters or more.
Sapphire Propertie
| Physical | |
| Chemical formula | Al2O3 |
| Density | 3.97 g/cm3 |
| Hardness | 9 Mohs |
| Melting point | 2050oC |
| Max. use temperature | 1800-1900oC |
| Mechanical | |
| Tensile strength | 250-400 MPa |
| Compressive strength | 2000 MPa |
| Poisson's ratio | 0.25-0.30 |
| Young's Modulus | 350-400 GPa |
| Bending strength | 450-860 MPa |
| Rapture Modulus | 350-690 MPa |
| Thermal | |
| Linear expansion rate (at 293-323 K) | 5.0*10-6K-1(⊥ C) |
| 6.6*10-6K-1(∥ C) | |
| Thermal conductivity (at 298 K) | 30.3 W/(m*K)(⊥ C) |
| 32.5 W/(m*K)(∥ C) | |
| Specific heat (at 298 K) | 0.10 cal*g-1 |
| Electrical | |
| Resistivity (at 298 K) | 5.0*1018 Ω*cm(⊥ C) |
| 1.3-2.9*1019 Ω*cm(∥ C) | |
| Dielectric constant (at 298 K, in 103-109 Hz interval) | 9.3 (⊥ C) |
| 11.5 (∥ C) | |
Sapphire is, as stated above, an anisotropic crystal, and the values given above are average values. Please remember that this engineering
data is representative only, and should not be considered absolute or warrantable.
Sapphire Glass Technique Index :
| Property | Specification |
| Thickness | 0.5-50mm |
| Size tolerance | +0.0/-0.25 |
| Edge Finish | Ground and beveled |
| Surface Quality | 40-20 scratch-dig |
| Surface Flatness | λ/4 @ 633 nm |
| 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 |
Products Detail
The Specifications for Sapphire Watch Glass
SIZE: dia20~dia50mm,
Orientaion: A±1°or C-axis
Thickness:1~5mm ok or by customzied
Surface: AS-CUT/ Lapped or Polished
Chiping: ＜0.1mm
Grade: optical grade without bubble, color,grain boundary
Material: 99.999％ Al2O3 single crystal
The Sapphire Process Step
+ 100% QC inspection before packing;
+ Without defects on our products,high purity;
+ Vacuum packing;
+ All our products pass SGS,CE,Rohs;
+ With good leading time;
+ Germany technology,Chinese price;
Please try to offer more details as belowing when you place an
order:Drawing,Tolerance,Material,Hardness,
Coating,Color,Semitransparent rate and use for what products.
FAQ:
Q2. What is the MOQ of optical lens?
A2. No MOQ for customer if optical lens is in stock. customized
watch glass size is for 10pcs.
Q3: Can I customize the products based on my need?
A3.Yes, we can customize the material, specifications and optical
coating for your optical components based on your needs.
Q4. How many days will samples be finished? How about mass
products?
A4. Generally, we need 1~10 days to finish the sample
production. As for the mass products, it depends on your order
quantity.
Q5 What's the deliver time? how about the payment term?
A5. (1) For inventory: the delivery time is 5 workdays.
(2) For customized products: the delivery time is 7 to 25 workdays.
According to the quantity.
(3). we required 100％ payment before the delivery by T/T, Western Union, Paypal etc.
Q6. How do you control lens quality?
A6. Producing process is in vacuum dust-free shop, like prepare
material, mixed material and take out . Four times quality checking
during production process.
