Essentially lead free glass and a glass tube made therefrom
AssigneeL. Electric Glass Co. Ltd.
InventorSomchai Ovuthitham
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Abstract
The invention relates to an essentially lead free glass. The lead free glass is suitable for making glass tubes and glass tubes for electric lamps in particular. The essentially lead free glass is characterized by having the lead oxide of a lead glass replaced by 1.0-3.0% by weight of lithium oxide. The ultraviolet radiation absorption of the glass is improved for wavelengths shorter than 320 nm. by the presence of 0.1-0.3% by weight of cerium oxide (CeO2) and 0.05-0.15% by weight of titanium dioxide (TiO2). With such an essentially lead free glass the transmittance of visible radiation may also be improved.
Claims12
An essentially lead free glass comprising:
- 7 Compound Percentage Li2O 1.0-3.0 CeO2 0.1-0.3 TiO2 0.05-0.15
An essentially lead free glass comprising:
- 8 Compound Percentage SiO2 65.0-75.0 Al2O3 2.0-4.0 B2O3 1.0-3.0 BaO 3.0-5.0 MgO {close oversize brace} 6.0-9.0 CaO Na2O 6.0-9.0 K2O 3.0-5.0 Li2O 1.0-3.0 CeO2 0.1-0.3 Fe2O3 (0.01) optional TiO2 0.05-0.15
Dependencies are inferred from the claim text.