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Formula: SiO₂
Form: Granule
Material: Quartz - Fused
CAS Number: 14808-60-7
Commodity: Ceramics
Goodfellow's Fused Quartz Granules are high-purity silicon dioxide (SiO₂) particles produced through a fusion process, resulting in an amorphous structure with exceptional optical and thermal properties. These granules exhibit very low thermal expansion, excellent thermal shock resistance, and high transmission across a wide range of wavelengths, including ultraviolet. Their chemical inertness and high purity make them ideal for applications requiring minimal contamination. Fused quartz granules are widely used in industries such as semiconductor manufacturing, optical fiber production, and advanced materials processing. They serve as raw materials for producing high-purity crucibles used in silicon wafer production, as precursors for manufacturing synthetic fused silica optical components, and as fillers in specialty composites. In cutting-edge applications, these granules are utilized in the development of advanced optical fibers for telecommunications and in the production of high-performance mirror substrates for astronomical telescopes. In research settings, fused quartz granules play a crucial role in studying novel glass formation techniques and in developing new materials with enhanced optical and thermal properties. Their reliability and versatility make them essential in both industrial processes and scientific investigations, particularly in fields pushing the boundaries of optical and semiconductor technologies.
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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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