Sapphire Furnace Viewport
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Furnace Camera Sapphire View Window | Kiln & Combustion Monitoring Optical Port Felix Glass custom fabricates single-crystal sapphire viewports dedicated to high-temperature furnace camera systems, kiln observation, combustion monitoring and pyrometer sight ports. Sapphire withstands extreme furnace heat and rapid thermal cycling, outperforming fused silica for long-run furnace visual inspection. High-temperature stable AR coatings are available to boost camera imaging clarity. Furnace Camera Sapphire Viewport | High Thermal Shock Single-crystal sapphire (Al₂O₃) is the preferred sight window material for furnace camera viewports. It supports continuous operation up to ~1700°C, with low thermal expansion, excellent thermal shock resistance and chemical resistance against furnace flue gas and ash. It transmits UV, visible and NIR up to ~5μm, perfectly matching visible/NIR furnace camera and pyrometer detection bands. Material substrate does not equal final performance grade. Specify furnace temperature, camera wavelength and gasket sealing geometry for accurate quotation. Interferometer Inspection Precision Polishing Furnace Sapphire Viewport All furnace sapphire viewports are polished for low scatter to avoid camera flare. Thermal cycling testing is available for critical continuous furnace operation. For furnace camera imaging, high-temperature stable AR coating reduces surface reflection and improves image brightness. Standard room-temperature AR coatings will delaminate under repeated furnace heat cycles. We match coating wavelength to your camera sensor band. Learn more about optical coating technology. To generate an accurate quotation within 24 hours, please prepare below information: Sapphire survives higher temperature and stronger thermal shock. Fused silica is budget-friendly but prone to cracking under frequent rapid heating cycles in heavy industrial furnaces. No. Sapphire transmission cuts off around 5μm. For 8–14μm LWIR thermal cameras, CVD ZnS is the correct optical substrate. Yes. We custom machine counterbores, step edges and sealing grooves to mate with your existing furnace camera housing, with optical polishing on the camera side.
High Temperature Furnace Sapphire Viewport Manufacturer
OEM Custom Machining | High-Temp AR Coating | Kiln Sight GlassMaterial & Grade Overview
Key Specifications & Custom Options
Substrate Material
Single Crystal Sapphire (Al₂O₃)
Shape
Round viewport, square plate, stepped window, custom flange profile
Size Range
Dia 10mm‑250mm, custom thickness, counterbore, gasket sealing groove
Surface Quality
20‑10 /40‑20 scratch‑dig, camera-grade low-scatter polishing
Working Wavelength Band
0.2–5.0μm, Vis / NIR for furnace camera & pyrometer
Coating Options
Uncoated, visible AR, NIR AR, high-temperature anti-reflection coating
Custom Machining
Chamfer, counterbore, sealing groove, step edge, gasket mating surface
Inspection
Interferometer, spectrophotometer, thermal cycling test optional, COA available
Manufacturing & Inspection Evidence
Typical Application
Coating Selection Guide
Order & Quotation Requirements (Valid RFQ Checklist)
Send Drawing For Quote
FAQ Snippets
Why choose sapphire instead of fused silica for furnace camera viewport?
Can this sapphire viewport be used for 8–14μm LWIR thermal camera?
Can you machine the sealing step to match our furnace camera flange and gasket?
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