1. To obtain ruby glasses, which are characterized by stable pigmentation and better chemical stability in relation to alkali solutions, the following components must be included in the melt: SiO2, B2O3, Al2O3, ZrO2, CaO, BaO, ZnO, Na2O, K2O, CdS, Se, and the CdS:Se ratio must be 3:1.
2. Melting of selenocadmium ruby glasses must be performed in a weakly reducing atmosphere at a maximum temperature of 1450°C.
3. Of known methods of hardening glass, the most important (from the point of view of hardening prosthetic glass eyes) are low-temperature ion-exchange, application of silicoorganic protective coatings, deposition of glass or quartz protective coatings in a vacuum, and the deposition of metallic-oxide coatings.
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Nadareishvili, T.B., Palhomova, T.S., Labutina, L.V. et al. Improving the quality of prosthetic glass eyes. Biomed Eng 13, 300–303 (1979). https://doi.org/10.1007/BF00555676