A strengthened glass according to the present invention is characterized by having a glass composition comprising, in % by mass, 40 to 60% of SiO2, 15 to 25% of Al2O3, 0 to 13.5% of B2O3, 12 to 24% ofNa2O and 0% or more and less than 3% of MgO.
본 발명의 강화 유리는 유리 조성으로서 질량%로 SiO2 40∼60%, Al2O3 15∼25%, B2O3 0∼13.5%, Na2O 12∼24%, MgO 0∼3% 미만을 함유하는 것을 특징으로 한다.