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China, Chinese High Temperature Glass Tempered Borosilicate Observation Window Lens1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Optical Lens InstrumentOptical LensCamera LensOptical Element
Heyuan Yushi Technology Co., Ltd
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Product DescriptionProduct DescriptionParameter CategoryParameter NameValue / Description / Typical ValueTest Conditions / NotesBasic InformationProduct NameSapphire Glass Optical WindowMaterial CompositionSingle Crystal α-Aluminium Oxide (Crystal StructureHexagonal Crystal SystemAnisotropic CrystalGrowth MethodKyropoulos Method, Heat Exchanger Method (HEM), Edge-defined Film-fed Growth (EFG)Product FormFlat, Spherical, Aspheric (Customizable)Can be customized to requirementsPhysical PropertiesDensity3.97 - 3.99 g/cm3Mohs Hardness9Second only to diamond (10)Knoop Hardness~2000 kg/mm2Load 100gYoung's Modulus345 GPaShear Modulus145 GPaPoisson's Ratio0.25 - 0.27Compressive Strength>2.0 GPaFlexural Strength> 690 MPaHighly dependent on surface finish qualityThermal PropertiesMelting Point2040 °CMaximum Operating Temperature1900 °C (Vacuum/Inert Gas) / ~1000°C (Air)High temps in air may cause surface devitrificationCoefficient of Thermal Expansion (CTE)@ 25°CThermal Conductivity25 - 35 W/(m·K)@ 20°C, ~30x higher than ordinary glassSpecific Heat Capacity750 J/(kg·K)@ 25°COptical PropertiesCrystal TypeUniaxial Negative CrystalRefractive Index (@587.6 nm)no = 1.768 / ne = 1.760Abbe Number72.2 (based on no)Low dispersionTransmission Range0.15 μm - 5.5 μmDeep UV to Mid-IRInternal Transmittance>85% @ 0.3μm (1mm thick) / >80% @ 4μm (1mm thick)Depends on thickness and coatingRefractive Index HomogeneityBirefringence0.008Crystal orientation must be consideredSurface SpecificationsDiameter/Size Tolerance±0.02 mm or customizedThickness Tolerance±0.01 mm or customizedParallelism< 3 arcsec (High Precision) / < 1 arcmin (Standard)Flatnessλ/10 @ 632.8nm / λ/4 (Standard)MIL-O-13830Surface Finish (Quality)10-5 Scratch-Dig (Standard) / Up to 20-10 (High Grade)MIL-PRF-13830BClear Aperture> 90%Bevel< 0.1mm x 45° (Protective bevel)Chemical & Electrical PropertiesChemical StabilityExcellent. Insoluble in water, resistant to strong acids (e.g., HCl, HNO) and strong bases (slight corrosion at high temps). Not resistant to (HF) and hot Phosphoric Acid.Water ResistanceClass 1ISO 719Dielectric Constant (@1 MHz)Volume Resistivity@ 25°CDielectric Strength480 kV/cmCoating OptionsAnti-Reflection (AR) CoatingReduces reflection losses, increases transmission in specific bands (e.g., NIR, VIS, specific laser wavelength)Single side R<0.25% @ specified wavelengthHigh Reflection (HR) CoatingAchieves high reflectivity at specific wavelengths (e.g., for laser cavities)R>99.5% @ specified wavelengthOleophobic/ Hydrophobic CoatingAnti-fingerprint, easy to clean, surface protectionWater Contact Angle > 110°Conductive Coating (e.g., ITO)Provides transparent conductivity or electromagnetic shieldingSheet resistance customizableProtective CoatingProvides extra protection against specific chemical environmentsApplication FieldsHigh-End Consumer Electronics: Smartphone camera covers, smartwatch crystals, fingerprint sensor covers.Industrial & Research: High-power laser windows, vacuum viewports, high-pressure/high-temperature viewports, spectrometer components.Aerospace & Defense: Missile domes, EO/IR pod windows, periscopes, armored vehicle viewports.Medical Devices: Endoscope protection lenses, surgical device windows, biosensors.Semiconductor Industry: Viewports for wafer processing equipment.CertificationsFAQ1. Q: "Sapphire glass? Is it made from real sapphire? Does that make it very expensive?"A: "That's an excellent question. Sapphire glass is not made from natural gemstone sapphires. It is a synthetic sapphire crystal. It's created by crystallizing aluminum oxide at high temperatures, resulting in a manmade material with identical physical properties to natural sapphire. It's called 'sapphire glass' due to its exceptional hardness and clarity. Regarding cost, the complex manufacturing process does make it more expensive than standard or mineral glass. However, it represents a valuable investment due to its unparalleled scratch resistance and durability, ultimately saving cost and hassle from frequent replacements in the long run." 2. Q: "What is the primary advantage of sapphire glass?" A: "Its core advantage is an exceptional Mohs hardness rating of 9, second only to diamond (10). This means it's highly resistant to scratches from everyday materials like keys, knives, or sand. Your watch crystal or lens cover will maintain a pristine, likenew clarity. Additionally, it offers excellent optical transmittance and strong antireflective properties (especially with coating), ensuring perfect readability or visibility in any lighting condition." 3. Q: "If it's so hard, does that mean it's shatterproof and impactresistant?" A: "You've touched on a crucial distinction. It's important to clarify: High Hardness ≠ High Impact Resistance. Due to its extreme hardness, sapphire glass can be more brittle. When subjected to sharp, concentrated point impacts, it may be more susceptible to cracking, shattering, or chipping compared to more ductile materials like mineral glass or plastic. Its specialty is scratch prevention, not drop protection. Many highend manufacturers improve impact resistance through structural design (like domed shapes) and increased thickness, but avoiding severe impacts is still recommended."
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