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Formula: SiO₂
Form: Filament
Material: Fused Quartz
CAS Number: 14808-60-7
Commodity: Ceramics
Diameter: 0.1mm
Fused Quartz Filament is a high-purity silica form optimized for use in advanced optical, electronic, and thermal applications where both structural precision and optical quality are essential. With exceptional thermal stability, low thermal expansion, and chemical inertness, it enables precise, contamination-free processing even under extreme heat. In additive manufacturing research, fused quartz filaments are being used as feedstock in laser-assisted 3D printing to create transparent optical components with high transmissivity and excellent thermal resistance. Industries such as optics, photonics, and high-vacuum electronics employ this material for applications like transmissive optical elements, hermetic seals, and filament-fed additive processes for complex geometries. Specific technologies benefiting include the production of transmissive lenses capable of focusing visible light and components for precision optical systems in aerospace and defense. Its critical role in research stems from enabling new fabrication techniques for complex, high-performance silica-based structures, making it invaluable to both industrial manufacturing and scientific exploration.
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Tolerances

Filament
Diameter ±20%
Length +5% / -1%

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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