Patent ID: 8383531

Claim:
A glass flake, having a composition comprising, in terms of mass %: 61<SiO 2 ≦65, 8≦Al 2 O 3 <12, 49<(SiO 2 —Al 2 O 3 )≦57, 3≦MgO≦3.5, 20≦CaO≦22.62, 0<(Li 2 O+Na 2 O+K 2 O)<2, 0≦TiO 2 ≦5, and Li 2 <0.36, wherein a content ratio of SiO 2 , to (MgO+CaO) is no less than 2.37 and no greater than 2.83, wherein a content of each of B 2 O 3 , F, ZnO, BaO, SrO, and ZrO 2 in the composition is less 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.