Mechanical 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