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Service Hotline:+86- 18061496696/18013846690
Service email: 84401513@qq.com
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"Ingredients
Optical glass is made by mixing oxides of high-purity silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium, barium, etc. in a specific formula, melting them at high temperature in a platinum crucible, and stirring them evenly with ultrasonic waves to remove air bubbles. Then, cool it down slowly over a long period of time to prevent the glass block from developing internal stress. After cooling, the glass blocks must be measured by optical instruments to check whether their purity, transparency, uniformity, refractive index and dispersion rate meet the specifications. Qualified glass blocks are heated and forged to form optical lens blanks.
Special type
Rare earth elements: In the 1930s, a new type of rare earth element optical glass emerged, mainly composed of oxides of lanthanum, thorium and tantalum. Rare earth element optical glass has a very high refractive index, opening up new possibilities for the design of optical lenses. Today, lanthanum glass is widely used in large-aperture lenses. Thorium glass has been halted from production due to its radioactivity.
Lead-free optical glass: Lead-free optical glass contains no lead or arsenic and is marked with the letter "N".
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