Sapphire Windows

Sapphire windows are made of single crystal material with aluminum oxide (Al2O3) as the main component. This material occurs in nature as corundum and is finely processed to create high-quality optical windows.

Benefits of Sapphire

Hardness and wear resistance: Sapphire has extremely high hardness, second only to diamond, with Mohs hardness reaching level 9. This makes sapphire windows have excellent wear resistance and can remain clear for a long time in high-speed, high-load working environments, reducing the frequency of maintenance and replacement.

Light transmittance(sapphire ir transmission): Sapphire windows have good transmittance in both visible and infrared light ranges. In the visible light range, its transmittance usually exceeds 80%; in the infrared range, especially in the near-infrared and mid-infrared bands, its transmittance can reach more than 90%.

Temperature resistance: Sapphire can maintain stable performance at temperatures up to 2000°C without deformation, softening or thermal expansion, ensuring stable light transmission efficiency in high temperature environments.

Good corrosion resistance: High resistance to acids, alkalis and some solvents, suitable for harsh environments.

Wide application adaptability: Due to the stability of its physical and chemical properties, sapphire windows are suitable for many different application scenarios.

Application:

Laser system: Sapphire windows can withstand the impact of high-power laser beams and are suitable for optical windows of lasers.

Optical sensors and instruments: protect sensors in harsh environments, ensure data accuracy, and are used in various precision optical instruments.

High-temperature and high-pressure equipment: In high-temperature and high-pressure processes, sapphire windows can maintain a clear view for easy observation and monitoring.

Aviation and aerospace: Used in aircraft cockpit windows, etc., suitable for its high strength and weather resistance.

Architecture and automotive fields: It can be used to make large glass curtain walls, skylights, and side windows of high-end cars. It is favored for its high strength, aesthetics, and light transmittance.

Specification:

FAQ:

Q: Sapphire Window Cleaning?

A: Sapphire window cleaning requires the right tools, techniques, and precautions to achieve a streak-free shine without damaging the glass. Start by using a soft, lint-free microfiber cloth or squeegee, along with a gentle cleaning solution, preferably one that’s ammonia-free to protect the sapphire coating.

Avoid abrasive materials that can scratch the surface. Always clean in a shaded area or during cooler hours to prevent streaks caused by quick drying. For tough spots, use a non-abrasive sponge and rinse with distilled water to avoid mineral residue. Regular maintenance and proper care ensure your sapphire windows stay crystal clear and durable for years to come.

A: Sapphire UV Transmission

Q: Sapphire is an excellent material for UV transmission due to its wide optical transmission range, spanning from UV to IR wavelengths. It offers high durability, exceptional thermal stability, and resistance to scratches, making it ideal for UV optics in harsh environments.

Sapphire’s low absorption and high transparency in the UV spectrum enable its use in scientific instruments, medical devices, and industrial applications. Its robust nature ensures consistent performance in extreme conditions, making it a preferred choice for precision UV transmission components.

A: Custom Sapphire Windows?

Custom sapphire windows are precision-engineered for applications requiring durability, clarity, and high performance. Resistant to scratches, extreme temperatures, and chemical exposure, sapphire windows are ideal for industries like aerospace, medical, and optics.

BOTE‘’s customization options include size, thickness, coatings, and shapes to meet specific design and functional requirements. With excellent optical transmission from UV to IR, they ensure superior performance in harsh environments. Optimize your equipment with custom sapphire windows tailored to your needs.

Q: Large Sapphire Windows?

A: BOTE offers sapphire windows with a diameter (or maximum diagonal) of 10 to 500 mm and a thickness of 0.3 to 100 mm.

Q: AR coated sapphire windows?
A: Sapphire windows are often enhanced with various coatings to meet specific application requirements. Common types of coatings include:

- Anti-Reflective (AR) Coatings: These coatings reduce surface reflections and enhance transmission across specific wavelength ranges. For instance, AR coatings can be optimized for the visible spectrum (400 – 700 nm) or the mid-wave infrared (MWIR) range (2.0 – 5.0 µm). 

- Hydrophobic and Oleophobic Coatings: Applied to repel water and oils, these treatments keep sapphire surfaces clean and reduce maintenance, making them ideal for environments where contamination is a concern. 

- Protective Coatings: Designed to withstand harsh conditions, these coatings enhance the durability of sapphire windows against environmental factors like abrasion, temperature fluctuations, and chemical exposure. 

Selecting the appropriate coating depends on the operational environment and the specific optical performance requirements of the application. 

Q: Sapphire Window HS Code?

A: The Harmonized System (HS) code for sapphire windows varies based on their specific use and characteristics. In the United States, unmounted sapphire lenses are classified under HS code 9001.90.4000, while other unmounted optical elements made of sapphire fall under HS code 9001.90.9000.  In Germany, sapphire windows are often classified under HS code 9032.90.00.  In Hong Kong, the commonly used HS code for sapphire windows is 7004.90.19.  
It's important to note that HS codes can differ by country and depend on the product's specific attributes. Therefore, it's advisable to consult with local customs authorities or a trade compliance expert to determine the accurate HS code for your sapphire window products.