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Material Information Quartz - Fused
SiO2
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General Description:
Silicon dioxide occurs naturally as sand or rock and when melted, the resulting product is called Fused Quartz. If the silicon dioxide is synthetically derived, the material is often called Fused Silica. Fused Quartz is very pure, has a high chemical resistance, good thermal shock resistance and is very strong in compression. The low thermal expansion coefficient makes it ideal for mirrors and optical flats. It is used for viewing windows, being transparent to wavelengths from around 0.2 to 3.5µm, insulators for electronic applications and for semi-conductor manufacturing.
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Chemical Resistance
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| Acids - concentrated | Good |
| Acids - dilute | Good |
| Alkalis | Fair |
| Halogens | Good |
| Metals | Fair |
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Electrical Properties
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| Dielectric constant | 3.8 |
| Dielectric strength ( kV mm-1 ) | 25-40 |
| Volume resistivity @25C ( Ohmcm ) | 1018 |
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Mechanical Properties
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| Compressive strength ( MPa ) | 1100 |
| Hardness - Knoop ( kgf mm-2 ) | 820 |
| Hardness - Vickers ( kgf mm-2 ) | 1000 |
| Shear strength ( MPa ) | 70 |
| Tensile modulus ( GPa ) | 72-74 |
| Tensile strength ( MPa ) | 48 |
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Physical Properties
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| Apparent porosity ( % ) | 0 |
| Density ( g cm-3 ) | 2.2 |
| Refractive index | 1.46 |
| Useful optical transmission range | 180-2500nm |
| Water absorption - saturation ( % ) | 0 |
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Thermal Properties
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| Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) | 0.54 |
| Melting point ( C ) | 1715 |
| Specific heat @25C ( J K-1 kg-1 ) | 670-740 |
| Thermal conductivity @20C ( W m-1 K-1 ) | 1.46 |
| Upper continuous use temperature ( C ) | 1100-1400 |
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