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Corning 7980
Glass Type: Fused Quartz Silica
Description
7980 is manufactured by Corning . It is a result of melting synthetically derived silicon dioxide and is used in many of the same applications as fused quartz. The main differences are that fused silica transmits better in the UV and fused quartz is lower in OH content. Both are highly pure, have high chemical resistance, good thermal shock resistance, and low thermal expansion coefficient. SGP can CNC mill, cut, drill, lap, and polish 7980 into any dimension or surface finish.
| Thermal Properties |
| Thermal Coefficient of Expansion |
(0/300°C): 5.5 X 10 -7/°C |
| Annealing Point |
1042°C / 1907.6 °F |
| Softening Point |
1585°C / 2885 °F |
| Strain Point |
893°C / 1639.4°F |
| Mechanical Properties |
| Density |
2.201 g/cm3 |
| Knoop Hardness |
522 Kg/mm2 |
| Young's Modulus |
72.7 Gpa |
| Poisson's Ratio |
.16 |
| Chemical Properties |
| Hydrolytic Resistance |
N/A |
| Acid Resistance |
N/A |
| Alkali Resistance |
N/A |
| Electrical Properties |
| Dielectric Constant |
E=3.8 |
| Resistivity |
N/A |
| Dielectric Strength |
N/A | |
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