Lead-free crystal glass

• Main Author: Čížek, Daniel
• Format: Patent
• Language: Czech; English
• Published: 21.12.2022
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

Bezolovnaté křišťálové sklo, s indexem lomu vyšším než 1,52 a měrnou hmotností nejméně 2,56 g.cm-1, spočívá v tom, že hmotnostně sestává z SiO2 65 až 75 % hmotn. Na2O 5 až 15 % hmotn. K2O 1 až 11 % hmotn. CaO 1 až 10 % hmotn BaO 1 až 9 % hmotn. ZnO 1 až 6 % hmotn. B2O3 0,1 až 3 % hmotn. Sb2O3 0,2 až 0,4 % hmotn. LiO2 0,2 až 2 % hmotn. Er2O3 + Nd2O3 0,05 ± 0,02 % hmotn., přičemž suma CaO + BaO je vyšší než 8 % hmotn. suma K2O + BaO je vyšší než 10 %hmotn. suma K2O + ZnO je vyšší než 9 % hmotn. Lead-free crystal glass, with a refractive index greater than 1.52 and a specific gravity of not less than 2.56 g.cm-1, consists by weight of SiO2 65 to 75% by weight Na2O 5 to 15 % by weight K2O 1 to 11 % by weight CaO 1 to 10 % by weight BaO 1 to 9 % by weight ZnO 1 to 6 % by weight B2O3 0.1 to 3 % by weight Sb2O3 0.2 to 0.4 % by weight. LiO2 0.2 to 2 % by weight Er2O3 + Nd2O3 0.05 ± 0.02 % by weight, the sum of CaO + BaO is higher than 8% by weight. the sum of K2O + BaO is higher than 10% by weight. the sum of K2O + ZnO is higher than 9% by weight.