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K9/bk7 optical glass performance: | ||
Mechanical properties | Standard value | |
Density | 2.51g/cm3 | |
Knoop hardness HK 100 | 610kg/mm2 | |
Young's modulus E | 82 x 103kN/mm2 | |
Poisson's ratio μ | 0.21 | |
Thermal properties | Standard value |
Softening point | 719°C |
Annealing Point | 657°C |
Strain point | 624°C |
Thermal conductivity | 1.1W/m.°C |
Specific heat | 879J/kg.°C |
Coefficient of thermal expansion | 7.1×10E-6/K |
1.One of borosilicate glasses
2.Apply for the plates of small reflective mirrors and transmittance optical glass
3.Stable chemical characters
4.Hard materials and without scratch.
5.Little bubbles and impurities.
6.With high transmittance in wavelength from 350-2000nm.
√ Microscopic instruments
√ Optical metrological instrumentsLaser protective windows
√ Optical instruments of surveying and mapping
√ Machine vision devices
√ Optical detection instruments
√ The popular science optical
√ A digital opticalOptical test instruments
√ Fiber optic instruments
√ Laser Instruments
√ Electro-optic displays
√ Observation instrument measuring instrument andphotography












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