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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 bei...

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1. Verfasser: JAUPAIN,MAURICE
Format: Patent
Sprache:fin ; swe
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Zusammenfassung: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.