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This invention relates to photochromic glasses exhibiting refractive indices greater than 1.59, densities no higher than 3.1 g/cm , Abbe numbers of at least 40, weight losses no greater than 0.01 mg/cm in the A.O. test, and which, when exposed to actinic radiation at room temperatures, darken to tra...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	ROGER JEROME ARAUJO
Format:	Patent
Sprache:	por
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:	This invention relates to photochromic glasses exhibiting refractive indices greater than 1.59, densities no higher than 3.1 g/cm , Abbe numbers of at least 40, weight losses no greater than 0.01 mg/cm in the A.O. test, and which, when exposed to actinic radiation at room temperatures, darken to transmittances below 40% and fade at least 15 percentage points of transmittance after five minutes' removal from the actinic radiation.