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Sapphire Windows provide durable optical protection for sensors, detectors, and laser systems without affecting magnification. They feature high transparency from UV to mid-IR and strong resistance to heat and corrosion, making them reliable in infrared imaging and harsh environments. HM is a professional supplier and manufacturer of high-quality sapphire windows.
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| Density | 3.97–4.1 g/cm3 |
| Materials | AI2O3 |
| Melting Piont | 2045 ℃ |
Sapphire Windows are precision optical plates that protect sensors and detectors while maintaining optical clarity. With a wide transmission range from ultraviolet to mid-infrared and excellent durability under high temperature and chemical exposure, they perform reliably in industrial, scientific, and laser applications. Heeger Materials provides high-quality Sapphire Windows for demanding optical and environmental conditions.

| Category | Property | Specification |
|---|---|---|
| General Composition | Chemical Formula | Aluminum Oxide (Al₂O₃), single crystal |
| Crystal Structure | Crystal System | Trigonal, hexagonal lattice |
| Melting Point | — | 2045℃ |
| Physical Properties | Thermal Expansion Coefficient | Parallel to optical axis: 6.7 × 10⁻⁶ /K Perpendicular to optical axis: 5.0 × 10⁻⁶ /K |
| Specific Heat | 0.18 Cal/g·K (25℃) | |
| Poisson’s Ratio | 0.28 | |
| Density | 3.97–4.1 g/cm³ | |
| Hardness | Mohs: 9 Vickers (Hv) ≥1700 kg/mm² | |
| Elastic Modulus | 340–380 GPa | |
| Compressive Strength | 2.1 GPa | |
| Tensile Strength | 0.19 GPa | |
| Flexural Strength | 448 MPa | |
| Optical Properties | Refractive Index | Parallel: 1.769 Perpendicular: 1.76 |
| Transmission | 86% (280–3500 nm) | |
| Electrical Properties | Resistivity | >10¹⁶ Ω·cm (25℃) |
| Dielectric Constant | 7.5–10 | |
| Chemical Properties | Corrosion Resistance | Not corroded by acids or alkalis at room temperature |
| Item | Specification |
|---|---|
| Dimensions | Diameter up to 300 mm; for non-circular shapes, max diagonal ≤ 300 mm |
| Thickness | 0.05–300 mm (For ultra-thin sheets, diameter-to-thickness ratio < 500:1) |
| Parallelism | 10″ |
| Thickness Uniformity | <2 μm @150 mm |
| Surface Quality | Options: 80/50, 60/40, 40/20, 20/10, 10/5 |
| Flatness | PV: RMS ≤1/4λ @632.8 nm |
| Coating | Anti-reflective or blocking coating per customer request |
| Packaging | Tray packaging or cleanroom vacuum packaging |
Sapphire Coated Optical Window features single or double-sided coatings that enhance performance across the sapphire transmission range (280–5500 nm), increasing the transmittance of specific bands from 85% up to 92–98%. Coatings can also be designed as blocking filters for targeted wavelengths. For high-power laser applications, these windows can be produced with high-threshold coatings, optimized through material and coating system design to withstand intense laser exposure while maintaining durability and optical clarity.

Sapphire UV-Grade Window is made from high-quality KY sapphire, an excellent material for ultraviolet applications. Standard sapphire typically transmits UV starting from 220 nm, but our low-absorption KY sapphire windows extend the UV transmission edge down to 168 nm. Combined with precision coating technology, these UV-grade windows provide enhanced transmittance and performance across a broader UV spectrum, meeting the needs of advanced optical, scientific, and industrial applications.

Sapphire Transmission Window is one of the most widely used types of sapphire windows. To meet the requirements of imaging, high-power laser, and precision measurement applications, our sapphire transmission windows are processed for high transmittance and superior surface quality. Wavefront distortion can reach as low as 1/20λ, surface quality up to 10/5 grade, and surface roughness below 0.5 nm, ensuring excellent optical performance and reliability.

Sapphire Single-Side Reflective Window is widely used in optical tracking, measurement, and fiber reflection applications. Thanks to the excellent stability and durability of sapphire, it is increasingly replacing traditional materials such as quartz. Our sapphire reflective windows achieve single-side surface flatness (PV) up to 1/20λ, surface quality of 10/5 grade, and surface roughness below 0.5 nm. Additional services, including metal reflective coatings and anti-reflective coatings, are also available to meet specific application requirements.

Sapphire Protective Window is specially designed using the excellent physical and chemical properties of sapphire to protect internal instruments or sealed containers in harsh environments such as high temperature, high pressure, or corrosive conditions. These windows effectively isolate the internal components from the external environment while allowing safe observation. Depending on the application, Sapphire Protective Windows can be categorized as pressure-resistant, high-temperature resistant, deep-water resistant, or corrosion-resistant. They are widely used in underwater detection, high-temperature operations, oilfield exploration, pressure vessels, chemical plants, and high-power laser protection.

Ultra-Thin Sapphire Window refers to optical flat windows with a thickness below 0.1 mm. Using advanced double-sided polishing equipment, Heeger Materials can achieve highly stable and precise processing, maintaining excellent control over pressure and flatness. This allows for consistent batch production of ultra-thin sapphire windows ranging from 0.05 mm to 0.1 mm, providing high-quality optical performance for applications requiring minimal thickness and maximum transparency.


Sapphire Windows will be securely packaged in sturdy containers with cushioning materials to prevent movement or damage during shipping. This careful packaging ensures that the product arrives in perfect condition, maintaining its high-quality standards throughout the delivery process.

Heeger Materials Inc., a professional supplier and manufacturer of high-quality Functional Crystals products including Sapphire Windows, leverages extensive expertise in supply and export to offer competitive prices. We provide customized solutions to meet specific requirements, ensuring exceptional quality and customer satisfaction.
Heeger Materials Inc. was established in 2016 in Colorado, USA. We specialize in premium-grade metals, alloys, ceramics, powders, and other materials catering to research, development, and large-scale industrial production in scientific and industrial sectors.
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