$Low density alkali free optical glass - based on borosilicate contg. lime, titania, and lead oxide having high refractive index and low dispersion$

Low density alkali free optical glass - based on borosilicate contg. lime, titania, and lead oxide having high refractive index and low dispersion

Alkali face optical borosilicate glass with refractive gridex nd of 1.68-1.72, Abbe no Vd of 38-46 and density =3.2 g/cm3 comprises by wt. 20-30% SiO2, 10-25% B2O3, 15-45% CaO, 3-15% TiO2, 1-10% PbO, 0-3% MgO, 0-10% Al2O3, 0-10% ZrO2, 0-3% Z-O, 0-10% BaO, 0-5% La2O3. Glass contains no rare and expen...

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Bibliographische Detailangaben
Hauptverfasser:	AURES,JULIA, BYHAN,HANS-GUENTER
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	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
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Beschreibung
Zusammenfassung:	Alkali face optical borosilicate glass with refractive gridex nd of 1.68-1.72, Abbe no Vd of 38-46 and density =3.2 g/cm3 comprises by wt. 20-30% SiO2, 10-25% B2O3, 15-45% CaO, 3-15% TiO2, 1-10% PbO, 0-3% MgO, 0-10% Al2O3, 0-10% ZrO2, 0-3% Z-O, 0-10% BaO, 0-5% La2O3. Glass contains no rare and expensive raw materials and only a relatively small amt. of TiO2, hence it is inexpensive. It has a good resistance to crystallisation and weathering. The compsn. can be produced continuously.