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BK-7
Glass Type: Optical Glass
Description
BK-7 is manufactured by Schott Glass. It's an optical glass with high transmission and is virtually free of bubbles and inclusions. SGP can CNC mill, drill, cut, lap, and polish this material to many shapes, sizes, and surface finishes.
| Thermal Properties |
| Thermal Coefficient of Expansion |
(0/300°C): 70 X 10 -7/°C |
| Annealing Point |
550°C / 1022 °F |
| Softening Point |
719°C / 1326 °F |
| Strain Point |
624°C / 1155 °F |
| Mechanical Properties |
| Density |
2.51 g/cm3 |
| Knoop Hardness |
610 |
| Young's Modulus |
8.20 X 109 dynes/mm2 |
| Poisson's Ratio |
.206 |
| Chemical Properties |
| Hydrolytic Resistance |
class 2 |
| Acid Resistance |
class 1 |
| Alkali Resistance |
class 1 |
| Electrical Properties |
| Dielectric Constant |
N/A |
| Resistivity |
N/A |
| Dielectric Strength |
N/A | |
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