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Quartz (fused silica) circular sight glasses excel in high-temperature environments due to their superior clarity and resilience to thermal shock. Their low thermal expansion makes them perfect for use in furnaces, boilers, and reactors, where maintaining visibility is critical.
Quartz (fused silica) circular sight glasses excel in high-temperature environments due to their superior clarity and resilience to thermal shock. Their low thermal expansion makes them well suited for use in furnaces, boilers, and reactors, where maintaining visibility is critical. These glasses withstand rapid temperature changes, making them reliable for monitoring processes in demanding industrial settings. The circular design ensures easy installation and clear, unobstructed viewing, enhancing safety and operational efficiency.
| Property | Testing method | Obtained value |
|---|---|---|
| Thermal expansion coefficient | ISO 7991 | 6.2 × 10⁻⁷ ºK |
| Density at 25ºC | SN 7005 13 | 2.20 g/cm³ |
| Refractive index (λ = 587.6 nm) nd | — | 1.425 |
| Maximum annealing temperature | ISO 7884-8 | 1500 ºC |
| Short-term maximum temperature | ISO 7884-7 | 1450 ºC |
| Thermal shock resistance | ISO 7884 | 500 K |
| Young's modulus | — | 68.0 MPa |
| Poisson constant | — | 0.17 |
| Thermal conductivity 20ºC – 100ºC λ | — | 0.003 CAL |
| Photoelastic constant | DIN 52314 | (4.00 × 10⁻⁶) (mm²/N) |
| Specific electrical resistance 10⁸ Ωcm | DIN 52326 | 250 ºC |
| Dimensional tolerances diameter | DIN 8902 | PASS |
| Property | Testing method | Obtained value |
|---|---|---|
| Bubble on glass | DIN 7080 | PASS |
| Marks on glass | DIN 7080 | PASS |
| Chamfer tolerance | DIN 7080 | PASS |
| Viscous knots | DIN 7080 | No visible |
| Glass inclusions | DIN 7080 | Less than 0.2 mm |
Quartz sight glasses are essential in high-temperature ovens where visibility into the oven chamber is crucial for monitoring processes. They are used to observe internal conditions without compromising safety or performance. Quartz's high thermal resistance ensures durability under extreme temperatures, allowing operators to view the state of the materials being processed without opening the oven door. This capability is vital in industries like ceramics and glass manufacturing, where precise temperature control and visual monitoring are necessary for quality assurance.
In burners, quartz sight glasses provide a clear view of the combustion process. They are used to observe the flame and ensure proper combustion conditions. Quartz is highly resistant to thermal shock and chemical exposure, making it ideal for environments where high temperatures and corrosive gases are present. This allows for real-time monitoring and adjustments to maintain optimal burner performance in industrial heating and power generation.
Quartz sight glasses are designed to withstand environments where temperatures exceed 500°C. They provide a transparent view into high-temperature processes such as metal forging or high-temperature reactors. Their ability to endure extreme heat without deforming or degrading makes them indispensable where precise temperature monitoring and control are required.
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Contact us with your application details — pressure, media, and connections — and we will help you specify the right sight glass.