Quartz Properties:
Mechanical Properties
Fused quartz exhibits impressive mechanical properties, comparable to other high-strength materials. With a design compressive strength exceeding 1.1 x 10⁹ Pa (160,000 psi), it demonstrates remarkable durability. However, like all glass, surface flaws can significantly reduce its tensile strength, making surface quality critical. When properly maintained, fused quartz can achieve a tensile strength of over 4.8 x 10⁷ Pa (7,000 psi), though a design stress of 0.68 x 10⁷ Pa (1,000 psi) is typically recommended for practical applications. This combination of strength and precision makes it a reliable choice for demanding environments.
Typical Physical Properties of Fused Quartz
| Property | Typical Values |
|---|---|
|
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 |
|
Index of Refraction |
1.4585 |
|
Constringency (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 Attenuation |
Less than 11 db/m MHz |
Note: Typical values are for reference only
Comparison Charts of Momentive Technologies’ Fused Quartz Versus Synthetic Fused Silica
Click on images to enlarge
