Patent ID: 8518545

Claim:
A chemically tempered glass obtained by chemically tempering a glass comprising, as represented by mole percentage based on the following oxides: from 65 to 85% of SiO 2 ; from 3 to 15% of Al 2 O 3 ; from 5 to 15% of Na 2 O; from 0 and less than 2% of K 2 O; from 0 to 15% of MgO; and from 0 to 1% of ZrO 2 , wherein a total content SiO 2 +Al 2 O 3 of SiO 2 and Al 2 O 3 is at most 88%, and wherein D calculated by the following formula with the contents of the respective components is at most 0.18: D=12.8−0.123×SiO 2 −0.160×Al 2 O 3 −0.157×MgO−0.163×ZrO 2 −0.113×Na 2 O.