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Formula: SiO₂
Form: Tube
Material: Fused Quartz
CAS Number: 14808-60-7
Commodity: Ceramics
Fused Quartz Tube is a high-purity silica glass component engineered for exceptional thermal stability, low thermal expansion, and chemical resistance, enabling performance in extreme environments. Manufactured from high-purity SiO₂, these tubes maintain structural integrity under rapid temperature cycling and resist contamination from alkalis and most acids. They are widely used in semiconductor manufacturing, pharmaceutical packaging, and chemical process engineering. Specific applications include diffusion tubes for thermal processing of silicon wafers, precision reactor vessels for Raman spectroscopy studies in supercritical fluids, and ultra-clean containers for pharmaceutical formulations. In semiconductor production, coated fused quartz tubes can suppress sodium diffusion, enhancing device yield, while in research settings, fused quartz tube reactors allow precise kinetic and spectroscopic analysis at high temperatures and pressures. This combination of purity, formability, and durability makes fused quartz tubes essential in both industrial fabrication and advanced scientific experimentation.
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Tolerances

Tube
Outside Diameter =<2mm ±10%
Outside Diameter =<5mm ±10%
Outside Diameter >5mm ±10%
Wall 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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