作者: Kosuke Fujiwara , Akihiro Koyama
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摘要: A scale-like glass (10) having improved heat resistance and chemical is formed from a base material satisfying, in mass%, 60 ≤ SiO2 75, 5 < Al2O3 15, 3 CaO 20, 6 Na2O 20 9 (Li2O + K2O) 13. When 13 satisfied the content are preferably set within ranges of 13, respectively. 15 The working temperature 1,180-1,300˚C. difference ∆T obtained by taking devitrification 0-200˚C. transition 550-700˚C. acid index ∆W 0.05-1.5 mass%.