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Borosilicate glass having high transmission in UV-region,low thermal expansion and high chemical stability,process for the production there and use thereof
Borosilicate glass having high transmission in UV-region,low thermal expansion and high chemical stability,process for the production there and use thereof
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机译：在紫外线区域具有高透射率，低热膨胀性和高化学稳定性的硼硅酸盐玻璃，其生产方法及其用途
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摘要
The borosilicate glass has a UV transmission of at least 80% at a UV wavelength of about 254 nm for a borosilicate glass sheet thickness of 2 mm, a linear coefficient of thermal expansion, alpha 20/300, of 3.2 to 3.4x10-6 K-1, a hydrolytic resistance of class 1 and a composition in % by weight based on oxide of - glass formers 96%, - SiO2 from 79.0 to 81.0%, - B2O3 from 12.5 to 13.0%, - Al2O3 from 2.0 to 4.0%, - alkali metal oxides 2%, - wherein said alkali metal oxides include from 2.0 to 3.5% said K2O and from 1.0 to 2.0% said Li2O, - alkaline earth metal 0.3%, - oxides + ZnO - reducing agent 0.025 to 2%, and - non-oxidizing fining agent 0 to 3%. - The weight ratio of K2O to Li2O is from 2:1 to 1:1 in the borosilicate glass. The glass is particularly suitable as a UV transparent material for EPROM windows, UV lamps, photomultipliers, spectrophotometers, particularly any of the foregoing used under particularly difficult climatic conditions, and as a protective tube for UV lamps immersed in water in waste water treatment plants, in UV oxidation reactors and/or solar reactors.
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