Dynasil Fused Silica

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Material Safety Data Sheet for Corning HPFS®

Learn More About Corning’s Material Safety Data Sheet for fused silica glass. 

Dynasil’s Core Drill List

Learn More About Dynasil Fused Silica’s Standard Core Drill List

Dynasil Fused Silica’s Catalogs of Products and Services

Click here for Dynasil Fused Silica’s current product catalog information.

Click here for Dynasil Fused Silica’s 1986 product catalog information.

Fused Silica Properties

Fused silica glass is a form of non-crystalline silicon dioxide, produced synthetically by the vapor phase hydrolysis of a silicon halide. Fused silica is known as the purest form of glass and has many industrial uses due to its properties.

Mechanical Properties of Synthetic Fused Silica

Formula SiO2
Solid State Amorphous
Density (25°) 2.202 +/- .002 gm/cm
Refractive Index (632.8 nm) 1.457
Useful Optical Transmission Range 180-2500 nm
Water Absorption – Saturation 0%
Poisson’s Ratio 0.17
Elasticity (Young’s) Modulus (25°C) 745 x 10³ kg/cm²
Shear (Rigidity) Modulus (25°C) 320 x 10³ kg/cm²
Bulk Modulus (25°C) 420 x 10³ kg/cm²
Tensile Strength (25°C) 600 kg/cm²
Compressive Strength (25°C) 11.3 x 10³ kg/cm²
Hardness:
Knoop-KHm (100 gm load) 600 kg/mm²
Moh 7

 

Sonic Properties of Synthetic Fused Silica

Velocity of Sound:
Shear Wave 3.75 x 10³ m/sec
Compressional Wave 5.70 x 10³ m/sec
Ultrasonic Velocity (50°C):
Shear Wave 3.75 x 10³ m/sec
Compressional Wave 5.95 x 10³ m/sec
Temperature Coefficient of Ultrasonic Velocity:
Compressional Wave (°C⁻¹) 81.5 x 10⁻⁶
Sonic Attenuation > .11 db/mMhz
Internal Damping 1 x 10⁻⁵

 

Chemical Properties of Synthetic Fused Silica

Resistance:
Acids – Concentrated Good
Acids – Dilute Good
Alkalis Fair
Halogens Good
Metals Fair

 

Electrical Properties of Synthetic Fused Silica

Dielectric Strength:
25° C 300-400kV/cm
500° C 150-200 kV/cm
Dielectric Constant  3.8

 

Electrical Properties of Synthetic Fused Silica at 25° C

100 Hz 1 KHz 10 KHz 100 KHz 1 MHz 10 MHz 100 MHz 8.6 GHz 24 GHz
Dielectric Constant 3.826 3.826 3.826 3.826 3.826 3.826 3.826 3.824 3.82
Loss Tangent <.000004 <.000002 <.000005 0.00001 0.000015 0.00002 0.00003 0.00012 0.00033
Volume Resistivity Log10R, ohm-cm >15.0 >14.3 >12.9 11.7 10.5 9.34 8.2 5.65

Measurement performed at Laboratory of A.R. Von Hippel, Laboratory for Insulation Research, Massachusetts Institute of Technology, May 1970.

Thermal Properties of Synthetic Fused Silica

Softening Point  1600°C +/- 25°C
Annealing Point 1100°C +/- 20°C
Strain Point 1000°C +/- 20°C
Use Temperature:
Continuous 950°C +/- 50°C
Limited 1200°C +/- 50°C
Thermal Conductivity (25°C) 3.3 x 10⁻³ (cal cm)/(cm²sec°C)
Average Coefficient of Thermal Expansion:
20°C to 320°C 5.5 x 10 cm/cm°C
Specific Heat (25°C) 0.177 cal/gm°C
Thermal Diffusivity (25°C) 8.5 x 10⁻³

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