Mechanical Properties of Fused Quartz

Mechanical properties of fused quartz are much the same as those of other glasses. The material is extremely strong in compression, with design compressive strength of better than 1.1 x 10⁹ Pa (160,000 psi).

Surface flaws can drastically reduce the inherent strength of any glass, so tensile properties are greatly influenced by these defects. The design tensile strength for fused quartz with good surface quality is in excess of 4.8 x 10⁷ Pa (7,000 psi). In practice, a design stress of 0.68 x 10⁷ Pa (1,000 psi) is generally recommended.

To discover how Momentive's fused quartz compare to synthetic fused silica, click here.

Typical Physical Properties of Fused Quartz

Property	Value
Density	2.2 x 10³ kg/m³
Hardness	5.5 - 6.5 Mohs' Scale 570 KHN ₁₀₀
Design Tensile Strength	4.8 x 10⁷ Pa (N/m²) (7,000 psi)
Design Compressive Strength	Greater than 1.1 x 10⁹ Pa (160,000 psi)
Bulk Modulus	3.7 x 10¹⁰ Pa (5.3 x 10⁶ psi)
Rigidity Modulus	3.1 x 10¹⁰ Pa (4.5 x 10⁶ psi)
Young's Modulus	7.2 x 10¹⁰ Pa (10.5 x 10⁶ psi)
Poisson's Ratio	0.17
Coefficient of Thermal Expansion (20 °C - 320 °C)	5.5 x 10^-7 cm/cm • °C
Thermal Conductivity at 20°C	1.4 W/m • °C
Specific Heat at 20 °C	670 J/kg • °C
Softening Point	1683 °C
Annealing Point	1215 °C
Strain Point	1120 °C
Electrical Resistivity at 350 °C	7 x 10⁷ Ω • cm
Dielectric Properties at 20 °C and 1 MHz
Constant	3.75
Strength	5 x 10⁷ V/m
Loss Factor	Less than 4 x 10^-4
Dissipation Factor	Less than 1 x 10^-4
Index of Refraction	1.4585
Constringence (Nu value)	67.56
Velocity of Sound-Shear Wave	3.75 x 10³ m/s
Velocity of Sound/Compression Wave	5.90 x 10³ m/s
Sonic Attentuation	Less than 11 db/m MHz
Permeability Constants at 700 °C	(cm³ mm/cm² sec. cm of Hg)
Helium	210 x 10^-10
Hydrogen	21 x 10^-10
Deuterium	17 x 10^-10
Neon	9.5 x 10^-10

^{Typical properties are average data and should not be used as or to develop product specifications.}

For more information regarding the use guidelines for fused quartz, click here.

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