Clear fused quartz glass is a unique material with an unrivalled combination of purity, high temperature resistance, thermal shock resistance, high electrical insulation, optical transparency and chemical inertness.
Mechanical
Density
2.20 x 103 Kg/m 3
Youngs Modulus
74 x 106 KN/m 2
Rigidity Modulus
32 x 106 KN/m 2
Compresive Strength
20 x 106 KN/m 2
Tensile Strength
70 x 103 KN/m 2
Shear Strength
70 x 103 KN/m 2
Moh's Hardness
6
Electrical
Electrical Resistivity
2 x 10 19 ohm cm at 20°C
2 x 10 6 ohm cm at 800°C
Dielectric Strength
10 KV/mm at 20°C
2.5 KV/mm at 500°C
Thermal
Strain Point
1385°K
Annealing Point
1455°K
Softening Point
1853°K
Coefficient of Expansion
0.52 x 10 -6 per °C
Continuous Operating Temp.
>1000°C
Optical
Useful Optical Range
Synthetic 180 - 2000nm
Natural 275 - 2000nm
Refractive Index
n D (589 nm) - 1.458
Chemical
SiO 2 Content
99.995%
Total Metallic Impurities
10ppm (Typical)
Chemical Inertness:
Fused quartz does not react with acids with the exception of hydrofluoric and at high temperatures phosphoric. There is a slow reaction with caustic alkalies at normal temperatures. There is no reaction with water and steam at moderate temperatures and pressures.
More detailed information such as transmission curves and chemical impurity levels are available on request.
