Glass based on tio deep 2 bao b deep 2 o deep 3 al deep 2 o deep 3 with a refractive index of 1,83 to 2,00 for use in optical elements in particular balls and threads

摘要

Glass of high refractive index, particularly for the manufacture of spherical balls for traffic-warning signs, has the following composition in weight per cent, viz. 25-30 TiO2, 45-59 BaO, 3-10 B2O3, and 13-20 Al2O3, these constituents forming at least 95% of the total composition, the remainder being in the nature of impurities or such materials as SiO2, CaO, and MgO which will not reduce the refractive index below 1.83.