| abstract |
Disclosed is a glass flake (10) having improved heat resistance and improved chemical durability, which is composed of a glass base material satisfying, as expressed in mass%, 65 <= SiO2 <= 70, 5 <= Al2O3 <= 15, 1 <= MgO <= 10, 10 <= CaO <= 25 and 0.1 <= (Li2O + Na2O + K2O) <= 4. The temperature difference DeltaT obtained by taking the devitrification temperature of the glass base material from the working temperature thereof is preferably within the range of 0-200 DEG C. The glass transition temperature of the glass base material is preferably within the range of 580-800 DEG C. Furthermore, it is desirable that the value of DeltaW, which serves as an index for the acid resistance of the glass base material forming the glass flake (10), is within the range of 0.05-0.8 mass%. |