A glass of RI 1.50-1.60 contains (wt%) 65-66 SiO2, 5-12 B203, 16-19 Na2O, 1-4 of at least one of K20 or Li20, 4-6 CaO, 0-3 MgO, 1-3 of at least one of Fe2O3 or Al2O3. Specific compositions claimed are 65 SiO2, 8 B203, 16 Na2O, 2 Li2O, 5 CaO, 2 MgO, 1 Al2O3, 1 Fe2O3 and 65 SiO2, 6 B2O3, 17 Na2O, 3 K2O, 5 CaO, 2 MgO, 2 Al2O3.
Origin
Unknown
Journal Title
Usp 3 035 928, 22/5/62
Sector
Refractive Indexes
Class
RI 3