Lead-Free High-Quality Glass for Assorted Glassware

Data on the synthesis of lead-free glass for assorted glassware are presented. Glasses in the system SiO2–SnO2–BaO–CaO–Na2O–K2O with 2 – 10% SnO2 are studied. The effect of introducing BaO and SnO2 together on the crystallizability, density, CLTE, index of refraction and microhardness of the glasses is studied. Compositions with 6 – 8% BaO and SnO2 4 – 6% are recommended for high-quality assorted glasses. The refractive index of the glasses obtained is in the range 1.540 – 1.550, the microhardness is 3700 – 4900 MPa and the CLTE is (95 – 98) × 10 – 7 K– 1.