Core Pain Points We Solve
Ordinary quartz glass cracks easily under drastic high-low temperature thermal shock inside industrial furnaces
Conventional sight glass cannot withstand long-term continuous operating temperature above 1000°C
Flying high-temperature particles scratch the surface and reduce monitoring image clarity
Short service life leads to frequent shutdown replacement and production loss
Product Key Advantages
Excellent High-Temperature Resistance
Stable operation under continuous high heat environment
Outstanding Thermal Shock Resistance
Adapt to furnace temperature fluctuation
Mohs 9 High Hardness
Scratch resistant against high-temperature flying debris
Optional Broadband AR Coating
Reduce light reflection for furnace camera monitoring
CNC Custom Shaping Support
Flange contour processing and precision sealing edge machining
Low Thermal Expansion
Long service life and reduce equipment maintenance frequency
Engineering Specification Table
| Item | Specification |
|---|---|
| Base Material | Single crystal optical sapphire |
| Hardness | Mohs Grade 9 |
| Continuous Working Temperature | Customized for high-temperature industrial kilns |
| Surface Coating | Optional broadband AR anti-reflection coating |
| Feature | Thermal shock resistant, heat resistant, scratch-proof |
| Application | Industrial furnace, rotary kiln, thermal processing equipment, furnace camera monitoring |
In-House Manufacturing Capability
All processing completed in Class 100 dust-free workshop: Sapphire blank slicing, double-sided ultra-precision polishing, CNC contour machining, vacuum optical coating, precision edge processing, ultrasonic cleaning and comprehensive optical & dimensional inspection. No outsourced processing, stable quality for thermal processing industrial projects.
CNC Precision Contour Machining
Double-Sided Ultra-Precision Polishing
Our optical engineering team provides full technical support:
✓ Coating wavelength customized development
✓ Structural optimization design suggestion
✓ Working condition pressure & temperature simulation consultation
✓ Prototype verification & DFM manufacturability optimization
✓ After-sales technical support for system integration
Every optical component gets 100% optical inspection before delivery.
Why Choose Felix Glass
19+ Years of Experience
Manufacturing high-temperature sapphire optical components
Industrial Furnace Project Experience
Rich engineering experience for kiln monitoring optics
Prototype & Mass OEM
Support prototype sample testing and mass OEM production
Strict Pre-Shipment Inspection
Strict dimensional and optical inspection before delivery
Flexible Customization
Custom thickness, shape and installation flange size
Frequently Asked Questions
Q1: Can you produce sapphire viewports matching our furnace flange installation drawings?
A: Yes, we fully customize dimension, outline and edge structure according to customer technical drawings.
Q2: What is the sample lead time?
A: Sample production cycle: 8~14 working days.
Q3: How long can sapphire sight glass work continuously in high-temperature kilns?
A: Sapphire material possesses stable high-temperature performance, greatly extending service life compared with fused silica glass under equal working conditions.
Get Your Custom Quotation
Submit your maximum working temperature requirement, drawing files and optical demands via the RFQ form below. Our optical engineer will send detailed specifications and quotation within 24 hours.