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Diameter 18mm x Thickness 5mm-Quartz sight glass
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  • Diameter 18mm x Thickness 5mm-Quartz sight glass
  • Quartz sight glass disc with OD 18mm and Thickness 5mm, highlighting quartz glass material and precise dimensions for industrial use.
  • Stack of various clear fused quartz sight glass rings and discs of different diameters, arranged on a blue background.
  • Quartz lens showcasing excellent performance: solid weld, no bubbles/striations, high purity (SiO2 ≥99.99%), 4N purity, heat-resistant 1200°C, acid/alkali corrosion resistance, and full customization.
  • High purity quartz glass disc emphasizing key properties: light transmittance exceeding 94%, high flatness/parallelism, low coefficient of thermal expansion (CTE), excellent thermal shock resistance, and free of bubbles/striations
  • Two rectangular quartz lens blocks, showing "Step Window" and "Transparent Cold Polished" finishes, with custom HT/HP resist, smooth interior, non-adhesive/pollute-free properties.
High Purity Quartz Sight Glass Windows & Fused Silica Viewports | 1200°C Heat Resistant & Corrosion Proof

High Purity Quartz Sight Glass Windows & Fused Silica Viewports | 1200°C Heat Resistant & Corrosion Proof

$2.00

Custom OD x Wall Thickness (T/WT) available

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Quartz sight glass

High Optical Transmission, Excellent Transmittance, High Clarity, High Light Transmission.

High Temperature Resistance, Excellent Thermal Stability, Heat Resistant up to 1200°C.

Wide Range of Sizes, Full Specifications Available, Various Sizes & Specs, Comprehensive Rang

Acid & Alkali Resistant, High Chemical Resistance, Excellent Corrosion Resistance.

Product size

Product parameters

Product Name Quartz Sight Glass
Material High-Purity Quartz Glass
Key Features

  • Exceptional Optical Clarity: Provides clear, undistorted viewing across a broad spectrum (UV-Vis-IR).

  • Superior High-Temperature Resistance: Maintains integrity and optical properties at continuous high operating temperatures (e.g., up to 1100°C - 1200°C).

  • Excellent Chemical & Corrosion Resistance: Inert to most acids, solvents, and aggressive chemicals (exceptions include HF and hot phosphoric acid).

  • Robust High-Pressure Capability: Engineered to withstand significant pressure differentials in demanding industrial and laboratory environments.

  • Outstanding Thermal Shock Resistance: Tolerates rapid temperature changes without cracking or shattering due to extremely low thermal expansion.

  • Durable & Long-Lasting: Offers a long service life even under harsh operating conditions.
Applications

Quartz sight glasses are essential components for visual process monitoring and as protective barriers in a wide range of demanding applications, including:

  • Chemical & Petrochemical Industries: For viewing levels, processes, and reactions in reactors, tanks, pipelines, and vessels containing corrosive media or operating at high temperatures/pressures.

  • Pharmaceutical & Food Processing: Ensuring process integrity and allowing for visual inspection in sanitary or high-purity environments.

  • Power Generation & Boilers: Monitoring combustion, steam levels, and other critical processes in high-temperature and high-pressure systems.

  • Furnaces & Heat Treatment: Providing clear viewing ports into industrial furnaces and heat treatment chambers.

  • Semiconductor Manufacturing: As windows in process chambers for monitoring etching, deposition, or other critical steps.

  • Laboratory & Research: In custom experimental setups, pressure cells, and analytical instruments requiring direct observation under specific conditions.

Quartz Performance Table

Mechanical Properties Typical Value Thermal Properties Typical Value Electrical Properties Typical Value
Density 2.2 g/cm³ Softening Point 1780°C Electrical Resistivity 7 x 107 Ω·cm
Compressive Strength 1100 MPa Annealing Point 1250°C Dielectric Strength 250 - 400 kV/cm
Flexural Strength 67 MPa Specific Heat (20-350°C) 670 J/kg·°C Dielectric Constant 3.7 - 3.9
Tensile Strength 48 MPa Thermal Conductivity (20°C) 1.4 W/m·°C Dielectric Absorption Coefficient <1 x 10-4
Poisson's Ratio 0.14 - 0.17 Refractive Index 1.4585 Dielectric Loss Tangent <1 x 10-4
Young's Modulus 72000 MPa Coefficient of Thermal Expansion 5.5 x 10-7 /°C
Shear Modulus 31000 kPa Working Temperature 1750 - 2050°C
Mohs Hardness 5.5 - 6.5 Short-Term Service Temperature 1300°C
Strain Point 1280°C Continuous Service Temperature 1100°C

Full specification

Thickness: 0.1mm - 100mm | Contact Us | Custom Orders Supported

Heat resistance

Quartz sight glass maintains exceptional physical integrity and chemical stability, ensuring clear and reliable observation even under extreme high-temperature and pressure conditions.

High Transmittance

Engineered from high-purity fused silica, our quartz sight glass offers outstanding light transmittance across a broad spectrum and excellent surface quality for clear, undistorted visual monitoring.

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