H-K9L is an excellent less expensive alternative BK7 glass.
H-K9L is a great subsitute for fused silica when extremely hard glass is not required. H-K9L benefits includes:
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H-K9L are the Chinese equivalent of BK7 glass wafers. The specs are nearly the same, but the price for H-K9L windows is much more affordable for researchers and industry.
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Below are just some of the H-K9L specs that we carry.
Diam 25.4mm, 1000 um thick, DSP
Flatness: better than 1 lambda
Dia 100mm, 1,000 um thick, DSP
TTV < 1um
Parallelism <1 arcsec
H-K9L Glass Wafers