Quartz Wares

Quartz crystals are chiral, and exist in two forms, the normal quartz and the high-temperature quartz. The transformation from quartz to beta-quartz takes place abruptly at 573°C (846 K). Since the transformation is accompanied by a significant change in volume, it can easily induce fracturing of ceramics or rocks passing through this temperature limit.

Technical Details of Quartz Wares

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.

Density 2.20 x 103 Kg/m3
Young's Modulus 74 x 106 KN/m2
Rigidity Modulus 32 x 106 KN/m2
Compresive Strength 20 x 106 KN/m2
Tensile Strength 70 x 103 KN/m2
Shear Strength 70 x 103 KN/m2
Moh's Hardness 6
Electrical Resistivity 2 x 1019 ohm cm at 20o
2 x 106 ohm cm at 800oC
Dielectric Strength 10 KV/mm at 20o
2.5 KV/mm at 500oC
Strain Point 1385oK
Annealing Point 1455oK
Softening Point 1853oK
Coefficient of Expansion 0.52 x 10-6 per oC
Continuous Operating Temp. >1000oC
Useful Optical Range Synthetic 180 - 2000nm 
Natural 275 - 2000nm
Refractive Index n D (589 nm) - 1.458
SiO2 Content 99.995%
Total Metallic Impurities 10ppm (Typical)

Chemical Interness

Fused quartz does not react with expection 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

New products

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    HA CYC 5

    Cylindrical Shape Alumina Crucibles with outer diameter 20 mm with a thickness of 2.5 mm, height of 30mm and a storage volume of 5 CC.

  • HA CYC 10
    HA CYC 10

    Cylindrical Shape Alumina Crucibles with outer diameter 30 mm with a thickness of 2.5 mm, height of 30mm and a storage volume of 10 CC.