OPAQUE FUSED QUARTZ
The opaque quality comes from quartz sands of high purity when reduced to a molten state at a temperature of approximately 2000° C. The high temperature produces a vitreous material characterized by the presence of a multitude of gaseous micro-bubbles. These bubbles diffract light, giving the material its opacity. The term opaque silica is mainly used for molded or centrifuged parts, while the product obtained by drawing is normally referred to as translucent.
Opaque silica glass offers a number of exceptional properties, such as:
- Extreme Hardness
- Low Expansion
- Excellent High Temperature Resistance
- Extreme Chemical Purity
- Excellent Corrosion Resistance
- Excellent Electrical Insulation Properties
- Remarkable Stability Under Atomic Bombardment
MECHANICAL PROPERTIES |
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| Specific Density (according to fusion process) | 1.98 to 2.12 | ||
| Hardness (Mohs scale) | 7 | ||
| Rupture stress: | traction | N.m-2 | 2.107 |
| compression | N.m-2 | 5.108 | |
| To view an enlarged version of this chart, click HERE | |||
ELECTRICAL PROPERTIES |
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| Dielectric constants | 3.5 | |
| Dielectric rigidity | V.m-1 | 5.106 |
| Loss coefficients at 1 MHz | 20.10-4 | |
| To view an enlarged version of this chart, click HERE | ||
THERMAL PROPERTIES |
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| Linear expansion coefficient | K-1 | 5.4.10-7 | |
| Specific heat at 20° C | J.kg-1. K-1 | 7.5.102 | |
| Heat conductivity at 20° C | W.m-1. K-1 | 1.05 | |
| Annealing point | ° C | 1120 | |
| Softening point | ° C | 1650 | |
| To view an enlarged version of this chart, click HERE | |||
CHEMICAL PROPERTIES |
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| SiO2 content | % | 99.8 | |
| Element content (typical analysis) | Fe | ppm | 70 |
| Ti | ppm | 100 | |
| Al | ppm | 220 | |
| Ca | ppm | 40 | |
| Mg | ppm | 11 | |
| Na | ppm | 25 | |
| K | ppm | 40 | |
| Li | ppm | 5 | |
| To view an enlarged version of this chart, click HERE | |||
Opaque Fused Quartz Labware & Trays
