CHEMICALLY STRENGTHENED GLASS
Provided is a chemically strengthened glass having a sheet thickness of less than 300 μm, having a surface compressive stress of 200 MPa or more and satisfying CT≤4×(t/1000+0.02) −2 +90, in which an internal tensile stress is CT (MPa) and the sheet thickness is t (μm).
1 . A chemically strengthened glass
having a sheet thickness of less than 300 μm,
having a surface compressive stress of 200 MPa or more and
satisfying CT≤4×(t/1000+0.02) −2 +90, wherein an internal tensile stress is CT (MPa) and the sheet thickness is t (μm).
2 . The chemically strengthened glass according to claim 1 , satisfying CT>−38.7×ln(t/1000)+48.2, wherein the internal tensile stress is CT (MPa) and the sheet thickness is t (μm).
3 . The chemically strengthened glass according to claim 1 , having a depth of a compressive stress layer of 3 μm or more.
4 . The chemically strengthened glass according to claim 1 , having a depth of a compressive stress layer of 50 μm or less.
5 . The chemically strengthened glass according to claim 1 , having a surface roughness Ra of a surface of the chemically strengthened glass of 1 to 300 nm.
6 . The chemically strengthened glass according to claim 5 , wherein the surface roughness Ra is controlled by a slimming processing.
7 . The chemically strengthened glass according to claim 1 , comprising, expressed by mol % on the basis of oxides, 64 to 72% of SiO 2 , 10 to 18% of Na 2 O, 0 to 5% of K 2 O, and 1 to 9% of Al 2 O 3 , wherein a ratio of (Na 2 O+K 2 O)/Al 2 O 3 is 1.8 to 5.
8 . The chemically strengthened glass according to claim 1 , wherein the chemically strengthened glass is to be used by being brought into contact with, through an adhesive layer, a material to be covered having a bending rigidity larger than that of the chemically strengthened glass.