Alkali-lime-silica Glass vs. Fused Silica

Both alkali-lime-silica glass and fused silica are glass and glass-ceramics. There are 9 material properties with values for both materials. Properties with values for just one material (20, in this case) are not shown.

For each property being compared, the top bar is alkali-lime-silica glass and the bottom bar is fused silica.

Alkali-Lime-Silica Glass Fused Silica (Fused Quartz)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		2.7
Density, g/cm³		2.2

Dielectric Strength (Breakdown Potential), kV/mm		28
Dielectric Strength (Breakdown Potential), kV/mm		30

Elastic (Young's, Tensile) Modulus, GPa		78
Elastic (Young's, Tensile) Modulus, GPa		73

Electrical Dissipation At 1 MHz		0.0088 to 0.053
Electrical Dissipation At 1 MHz		0.00011

Electrical Resistivity Order of Magnitude, 10^x Ω-m		10
Electrical Resistivity Order of Magnitude, 10^x Ω-m		14

Flexural Strength, MPa		34 to 170
Flexural Strength, MPa		67

Stiffness to Weight: Axial, points		16
Stiffness to Weight: Axial, points		18

Stiffness to Weight: Bending, points		53
Stiffness to Weight: Bending, points		63

Thermal Expansion, µm/m-K		9.0
Thermal Expansion, µm/m-K		0.5

Alkali-lime-silica Glass vs. Fused Silica

Material Properties

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