Sapphire glass is a synthetic sapphire that can easily and inexpensively produce gem-quality sapphire in the laboratory, with the same chemical composition and physical properties as natural sapphire.
Sapphire glass screen features
Sapphire glass. Similar to the steel jade composition, the hardness is 9, you can add a variety of chemical elements to create a variety of colors. Now commonly used is colorless. Its advantages are higher than ordinary glass, and the price is relatively high, mainly used to make the watch of high-end watches.
Sapphire glass/ruby glass has excellent thermal properties, excellent electrical and dielectric properties, and chemical corrosion resistance. It is resistant to high temperatures, good heat conductivity, high hardness, transparent infrared, and good chemical stability. Therefore, it is commonly used to replace other optical materials to make optical components, transparent infrared optical windows, and is widely used in infrared and far-infrared military equipment, such as: for night vision infrared and far infrared sights, night vision cameras and other instruments. And instruments for satellite and space technology, as well as windows for high-power lasers, various optical prisms, optical windows, UV and IR windows and lenses, observation ports for low-temperature experiments, and high-precision instruments for marine aerospace. Fully applied.
Sapphire glass identification
Laboratory method
The test is not sapphire glass, very similar to the identification of jewelry, the same equipment used, the most commonly used instrument for jewelry identification is the refractometer, which can determine the refractive index of the object being tested. Although sapphire glass is artificial, its refractive index is 1.76~1.77, just like natural one. Because sapphire glass is crystalline, it has a heavy refractive index like crystal, which is 0.008, which is detected. Rotating the polarizer on the eyepiece can be seen clearly.
The flat glass of the flat plate is best viewed, the spherical surface is not very good looking, and the refracting oil needs to be applied during the test. Mineral glass has a refractive index of about 1.52, which is easily distinguished from sapphire and it is not refraction. Another method is to use a polarizer. Any crystal can be inspected with a polarizer, such as crystal. Sapphire is also a crystal. When rotating a polarizer, the light and dark will alternate, with a period of 90 degrees per revolution. However, when using a polarizer to inspect the watch glass, it is necessary to take out the entire movement to expose the watch glass. However, some non-sapphire glass may also have a polarizing effect, because it is also made into a crystal, such as the word "Crystal". (more Japanese watches)
Drip method
The method of measuring sapphire glass by dripping water is to drop a small drop of water on the surface of the glass to be tested. If the water droplets are obviously high in the shape of beads, then it is sapphire glass; if the water droplets flow out, it is not sapphire glass. Any liquid thing, a small drop on a smooth medium surface, will have different liquid level, this specific situation is related to the nature of the medium and temperature, called liquid tension, also used to calculate the angle, including The watch oil for watches also has this technical indicator. It is the reason why the density and specific gravity of sapphire are relatively large and the surface is smoother and more delicate.
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