Glass Type: Optical Glass
Description
SCHOTT N-BK7® is 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 | Mechanical Properties | ||||||
|---|---|---|---|---|---|---|---|
| Thermal Coefficient of Expansion | (0/300°C): 70 X 10 -7/°C | Density | 2.51 g/cm3 | ||||
| Annealing Point | 550°C/1022 °F | Knoop Hardness | 610 | ||||
| Softening Point | 719°C /1326 °F | Young's Modulus | 8.20 X109 dynes/mm2 | ||||
| Strain Point | 624°C/1155 °F | Poisson's Ratio | .206 | ||||
| Chemical Properties | Electrical Properties | ||||||
|---|---|---|---|---|---|---|---|
| Hydrolytic Resistance | class 2 | Dielectric Constant | N/A | ||||
| Acid Resistance | class 1 | Resistivity | N/A | ||||
| Alkali Resistance | class 1 | Dielectric Strength | N/A | ||||
| Optical Properties | |||
|---|---|---|---|
| Refractive Index | 1.509 | ||