Glasses alumino - fluoro - borosilicate of lead moldable

摘要

P glass composition of a mouldable optical type alumino - fluoroborosilicate of lead, on the refractive index of between approximately 1,65 and 1,82 and abbe number of between approximately 27 and 39, good chemical durability in a humid atmosphere and of great stability, having a softening point inferior has 500c. / p & & p & this composition comprises the following approximate ponderale: 8 a, 20, 5 to 20 of bo, 50 to 70 of pbo, 1 a, 11 of alo.sub.2.sup.- and 2 to 7 by f. / p & & p & application for the manufacture by molding of optical lenses. / p