SUBSTRATE GLASS FOR MULTILAYERED FILM FILTER AND MULTILAYERED FILM FILTER

摘要

PROBLEM TO BE SOLVED: To provide substrate glass for a multilayered film filter which excels in workability and weatherability and gives therefore inexpensive and less apt to deteriorate multilayered films and the multilayered film filter. SOLUTION: The substrate glass for the multilayered film filter is characterized in that the polishing speed by a lapping method is≥10μm/min, the mass decreased in a boiling water bath is≤0.05 wt%/hr, and the mass decrease in an aqueous nitric acid solution of 0.01N is≤020 wt%/hr. COPYRIGHT: (C)2004,JPO