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Formula: SiO₂
Form: Disk
Material: Fused Quartz
CAS Number: 14808-60-7
Commodity: Ceramics
Surface Finish: Polished on Both Sides
Fused Quartz Disk is a high-purity silica component known for its optical clarity, thermal stability, and exceptional resistance to thermal shock. Manufactured from clear fused quartz with SiO₂ content exceeding 99.9%, it maintains dimensional stability under repeated cycling to high temperatures and offers low thermal expansion for precision applications. These disks are widely used in optics, semiconductor processing, and high-vacuum systems where contamination-free surfaces are critical. Key applications include optical windows for high-intensity light or laser systems, substrate holders in semiconductor lithography, and electron optic apertures requiring micromachined precision down to 0.05 mm with optical-grade finishes. In research and innovation, fused quartz disks enable advanced photonic experiments, high-temperature spectroscopy, and precision mechanical alignment under demanding conditions. Their combination of optical quality, thermal endurance, and chemical inertness makes them indispensable in both scientific instrumentation and industrial processing.
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Tolerances

Disc
Thickness ±20%

Material Properties for Ceramics

Chemical Resistance
Element Value
Acids - concentrated Good
Acids - dilute Good
Alkalis Fair
Halogens Good
Metals Fair
Electrical Properties
Element Value
Dielectric constant 3.8
Dielectric strength( kV mm⁻¹ ) 25-40
Volume resistivity( Ohmcm ) 10¹⁸@25
Physical Properties
Element Value
Refractive index 1.46
Useful optical transmission range 180-2500nm
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 2.2
Thermal Properties
Element Value
Melting point( C ) 1715
Upper continuous use temperature( C ) 1100-1400
Specific heat( J K⁻¹ kg⁻¹ ) 670-740@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 1.46@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 0.54@20-1000
Mechanical Properties
Element Value
Tensile modulus( GPa ) 72-74
Hardness - Knoop( kgf mm⁻² ) 820
Hardness - Vickers( kgf mm⁻² ) 1000
Shear strength( MPa ) 70
Tensile strength( MPa ) 48
Pultrusions
Element Value
Compressive strength( MPa ) 1100

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