N-Bk7 Optical Glass Windows
H-K9L(N-BK7)composition: SiO2=69.13% ,B2O3=10.75% ,BaO=3.07% ,Na2O=10.40%, K2O=6.29%, As2O3=0.36%.
(BK7) optical glass has excellent mechanical properties and very low air bubbles and impurities, good scratch resistance. Because of its chemical stability, no special treatment grinding and polishing. Used in optoelectronics, microwave technology, and many other areas of diffractive optical elements.
| H-K9L(BK7) propety | Value | |
| optical | Refractive index | 1.5168 |
| Abbe number | 63.96 | |
| Mechanical propety | Density | 2.51g/cm3 |
| Knoop hardness HK 100 | 610kg/mm2 | |
| Elasticity modulus | 82 x 103kN/mm2 | |
| Poisson ratio μ | 0.21 | |
| Thermal propety | Softening ponit | 719°C |
| Annealing point | 657°C | |
| Strain point | 624°C | |
| Thermal conductivity | 1.1W/m.°C | |
| Specific heat | 879J/kg.°C | |
| Thermal expansivity | 7.1×10E-6/K | |
| Chemical propety | Hydrolysis | 2Class |
| Acidproof | 1Class | |
| Alkalineproof | 2Class | |
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