Quartz Disc

Quartz Discs, Windows & Sight Glasses – High Purity Fused Quartz

High purity quartz disc with smooth polished surface, used in optical and laboratory applications
QuartzstepDisc

Our Quartz Discs are made from 99.99% pure fused silica (SiO₂), ensuring outstanding optical clarity, in addition to high thermal resistance and chemical durability.

These discs are engineered for industries where precision is essential. They tolerate extreme temperatures, resist thermal shock, and withstand aggressive chemical exposure. Moreover, they are reliable for both laboratory and industrial environments.

We supply discs in a wide range of diameters, thicknesses, and finishes. Therefore, they can be customized for use in semiconductor fabrication, optical instruments, laboratory setups, and high-temperature equipment.

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Our quartz discs provide several unique advantages:

  • Ultra-High Purity (99.99% SiO₂): This ensures minimal contamination for sensitive processes.
    Furthermore, it guarantees excellent results in semiconductor and optical applications.
  • Thermal Stability: Quartz discs remain stable up to 1100°C.
    As a result, they perform reliably in furnaces and high-temperature systems.
  • Optical Transparency: They transmit across UV, visible, and IR ranges.
    In addition, this makes them suitable for spectroscopy, laser optics, and scientific instruments.
  • Chemical Resistance: Resistant to acids and harsh chemicals.
    Therefore, they are ideal for cleanroom and laboratory environments.
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Applications

Semiconductor Industry

  • Wafer processing, etching, and furnace components
  • High-purity environment compatibility

Optical Instruments

  • Lenses, windows, and sight glasses
  • Optical lenses and windows in UV, Visible and IR systems
  • Common in spectrometers, microscopes, and telescopes

High-Temperature & Thermal Applications

  • Viewing ports and protective windows
  • Common in Furnace, reactors and vacuum chambers
  • Sight Glasses & Viewports

Laboratory & Industrial Equipment

  • Chemical-resistant covers and plates
  • Precision measuring instruments and sample holders

Laser Optics

  • Laser windows, mirrors, and beam splitters
  • Fused quartz can withstand high laser power and thermal loads

UV Applications

  • Deep UV radiation (down to ~180 nm)
  • Used in UV curing systems, Lithography
  • Disinfection equipment, and solar simulators

 

Data Sheet

 
PropertyValue
Material Purity (SiO₂)≥ 99.99%
Density2.2 g/cm³
Hardness (Mohs)7
Thermal Expansion (20–300°C)0.55 × 10⁻⁶ /K
Continuous Use Temperature1100°C
Softening Point1665°C
Annealing Point1140°C
Refractive Index (589 nm)1.458

STANDARD SIZES TABLE

Diameter (mm) Thickness (mm) Diameter (mm) Thickness (mm)
10 0.5 – 5.0 60 3.0 – 6.0
12 1.0 – 5.0 75 3.0 – 6.0
15 1.0 – 5.0 80 3.0 – 8.0
20 1.0 – 5.0 90 5.0 – 20.0
25 1.0 – 10.0 100 5.0 – 12.0
30 1.0 – 10.0 120 6.0 – 15.0
35 2.0 – 10.0 150 8.0 – 18.0
40 2.0 – 20.0 180 10.0 – 20.0
50 2.0 – 20.0 200 10.0 – 20.0

Our quartz discs and windows are manufactured in a wide range of standard sizes.
Diameters include 10mm, 12mm, 15mm, 20mm, 23mm, 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, 75mm, 80mm, 90mm, 100mm, 120mm, 150mm, 180mm, and 200mm.
Available thickness options cover 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, and 20mm.
For example, popular sizes include Quartz Disc 25mm x 1mm, Quartz Disc 25mm x 2mm, Quartz Disc 50mm x 3mm, Quartz Disc 100mm x 5mm, and Quartz Disc 150mm x 10mm.
Custom diameters and thicknesses can also be produced upon request.

Frequently Asked Questions (FAQ) About Quartz Disc

A quartz disc (also called a quartz window or optical quartz plate) is a flat, polished piece of fused silica. It is known for its strength, heat resistance, and excellent optical clarity across UV, visible, and IR ranges.
Quartz discs are widely used in semiconductor wafer processing, etching systems, and furnace components. In optics, they act as windows, lenses, and sight glasses. They’re also popular in laboratories as sample holders, protective covers, and chemical-resistant plates.
Standard quartz discs range from 10 mm to 200 mm in diameter with thicknesses between 1 mm and 20 mm. Common sizes include 25 mm × 2 mm, 50 mm × 3 mm, and 100 mm × 5 mm. Custom dimensions can also be made on request.
Quartz discs can withstand continuous temperatures up to 1,050°C and short-term exposure up to 1,200°C. They also resist thermal shock, making them reliable for high-temperature applications like furnace viewports.
Yes. Quartz discs provide excellent optical transmission from deep UV through visible to IR. They are used in spectrometers, microscopes, telescopes, and laser systems. Optical coatings, like anti-reflective (AR), can be applied for better performance.
Unlike regular glass, fused silica quartz discs can handle higher heat, have lower thermal expansion, and resist chemicals better. They also offer superior optical clarity, especially in the UV and IR spectrum.
Absolutely. Custom quartz discs can be made with specific diameters, thicknesses, drilled holes, edge polishing, or coatings depending on your requirements.
You can order high-quality quartz discs directly from MicroQsil, a trusted manufacturer of fused silica products. We supply both standard sizes and custom solutions worldwide.