1.material: BK7/B270. 2.colorless optical glass. 3.ensure product quanlity. 4.available for OEM Orders

Transparent optical glass /filter glasses /lens

Brief introduction :

K9/Bk7 optical glass characteristics

K9 (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.

Specifications :

1.material: BK7/B270. 2.colorless optical glass. 3.ensure product quanlity.4.available for OEM Orders

Technique index sign :   

    --Surface quantity:0/0,40/20 80/50

    --Surface accuracy:1/10 into,1/4 into2 into

    --Thickness business trip:±0.01mm±0.02mm

    --Center deviation:5Arc second1Arc Minute

    --Process the scope:The thickness is the most thin to attain 0.2 mm 

    --Coated

    --Tempered 

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

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Transparent optical glass /filter glasses /lens