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k9(bk7) Glass

    K9 (BK7) 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.

k9(bk7) Glass of Performance

Table 1.
Nature of optical Through rate
Index of refraction 1.51680
Abbe number 63.96

Table 2.
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 ¦Ì 0.21

Table 3.
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

Table 4.
Chemical performance Standard value
Hydrolysis 2 Level
Acid 1 Level
Alkaline 2 Level

k9(bk7) Glass's Spectra

k9(b270)'s Spectra

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