Patent ID: 8383532

Claim:
A glass flake, having a composition comprising, in terms of mass %: 60<SiO 2 ≦65, 8≦Al 2 O 3 <12, 49≦(SiO 2 —Al 2 O 3 )≦57, 1≦MgO≦5, 18≦CaO≦30, 2<Li 2 O≦4 2<(Li 2 O+Na 2 O+K 2 O)≦4, 0≦TiO 2 ≦5, and the composition containing each of B 2 O 3 , F, ZnO, BaO, SrO, and ZrO 2 in amounts lower than 0.1 mass %, and wherein the glass flake has an index of acid resistance in terms of a mass reduction rate ΔW 1 of 0.80 mass % or lower.