| Place of Origin: | Guangdong, China (Mainland) |
|---|---|
| Brand Name: | Tianzhili |
| Model Number: | sapphire glass |
| Price: | US $5.00 |
| Type: | Watches For Parts | Material: | Sapphire |
|---|---|---|---|
| Size: | 1-200mm | MOQ: | 100pcs |
| Shape: | Custom Shape | Surface Treatment: | Polished |
| Service: | OEM ODM | Surface Quality: | 80/50,60/40,40/20 |
| Usage: | Sapphire Glass For Watch | Coating: | AR,AF-Coating |
| High Light: | convex watch glass,convex sapphire |
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High Performance Polished Convex Crystal Glass Watches For Parts Type
Product Description
Synthetic sapphire glass is second only to diamond in hardness and despite its name, is not actually glass. It is, in fact, a synthetically produced crystal. Synthetic sapphire crystal – or synthetic sapphire glass – is extremely durable. The stone is typically grown in cylindrical sticks called boules, in a slow, costly and energy intensive process. The transparent material is produced by crystallizing pure aluminium oxide at very high temperatures. Chemically identical to natural sapphire stones, without the color, the round masses that form are sliced into pieces using diamond-coated saws. The discs are then ground and polished for use as watch glass or locket windows. Pandora Lockets are made with synthetic sapphire glass windows that beautifully display and carefully protect the Locket Elements within. The scratch-resistant surface and the exclusive look of the synthetic sapphire glass set Pandora’s Lockets apart from other locket designs and ensure the product is long-lasting.
| Property | Specification |
| Thickness | 0.5-50mm |
| Size tolerance | 0.02mm |
| 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 |
