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Address:No. 15, Shuanglou Road, Liuwei Industrial Park, Qutang Town, Haian County, Jiangsu

Tel:86-0513-88797122 , 88792571




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Discover the world better through Yinxing

Yinxing Optical is mainly engaged in the production and processing of optical glass (filter) and special glass.

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Product description

K9 (BK7) has excellent mechanical properties and very low bubble k9 (b270) product map and impurities, and has good scratch resistance. Due to its stable chemical properties, no special treatment for grinding and polishing is required. It is used in many fields such as optoelectronics, microwave technology, and diffractive optical elements.


Attributes Explanation
Transmission range 0.4µm to 2.5µm
Density 2.51 g/cc
Thermal expansion 7.1x10-6 /°k @ -30° + 70°c, & 8.3x10-6 /°k @ 20°c to 300°
Surface polishing bk-7 polishes extremely well & polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for uv & visible applications.
Surface graph surface figure of 1/10 wave to 1/4 wave @ 0.6328µm are specified mostly on lenses for ultraviolet & visible use.
Coating ar @ 0.8-2.5µm, ar @ 1.064, ar @ visible wavelength.
Application Astronomy, thermal imaging
Products produced Lenses, prisms, filters, filters, etc.


Wavelength Refractive index (n)
0.4047 1.530
0.4800 1.523
0.5461 1.519
0.6328 1.515
0.8521 1.510
1.0600 1.507
1.5300 1.501
1.9700 1.495
2.3250 1.489



China-K9: Nd: 1.516371 Vd: 64.13356

Short-BK7: Nd: 1.516800 Vd: 64.169998
HOYA-BSC7: Nd: 1.516800 Vd: 64.2
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