hochbrechende optical glasses in the system sio amp; amp; darr; 2 amp; amp; darr; b amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr; 3 amp; amp; darr; alkalioxid - erdalkalioxid la amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr 3 amp; amp; darr; - their own measurements, amp; amp; darr; 2 amp; amp; darr; tio amp; amp; darr; 2 amp; amp; darr; nb amp; amp; darr; 2 amp; amp; darr; o amp; amp; darr; 5 amp; amp; darr; brechwerten 1 , 79, 1.82, payment amp; amp; 32 and dense amp; amp; le; 4.0

摘要

the hochbrechenden optical glasses have brechwerte of 1.79 - 1.82, pay 32 and dense 4.0 and are suitable for brillennahteile and fernteile suitable. you have folgnde composition in wt.% sio 2 7.5 to 13.5; b 2o 3 13 - 19; al 2o 3 0 - 4; li 2o 0 - 3; all 20 0 4, c 20 0 4 4 18, cao, mgo, 0 to 6; sro 0 - 14; bao 0 - 14; pbo 0 - 15 0 - 7; zno; la 2o 3, y 2o 3, 13, 30, 0 to 6; gd 2o 3 0 - 6; their own measurements, 2 3 - 8; tio 2 5 - 13; nb 2o 5 - 12; where 3 0 - 6; ta 2o 5 0 - 6.