Glass for multilayer film filter and method for manufacturing the glass

摘要

Glass can have a high thermal expansion coefficient when it is made up of SiO₂, B₂O₃, Na₂O, K₂O, MgO and Al₂O₃; contains a partial crystal; and has a mean linear expansion coefficient not lower than of 125x10^-7K^-1 in a temperature range of 50° C. to 150° C. Using this glass as a substrate for a multilayer film filter can fully reduce temperature fluctuations in the filter properties.