the new optical glass with brechwerten of 1.73 - 1.88 and payment of 35 52 is in system b 2o 3 - la 2o 3, y 2o 3 - 3 - their own measurements, 2 and has a significant content of fluoride. with this composition, it is extremely entglasungsstabil, and thanks to the absence of cdo and tho 2 it is environmentally friendly.
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