Patent ID: 8349455

Claim:
Chemically tempered glass comprising, as represented by mole percentage based on the following oxides, from 50 to 75% of SiO 2 , from 1 to 15% of Al 2 O 3 , from 6 to 21% of Na 2 O, from 0 to 15% of K 2 O, from 0 to 15% of MgO, from 0 to 20% of CaO, from 0 to 21% of ΣRO (wherein R is Mg, Ca, Sr, Ba and/or Zn), from 0 to 5% of ZrO 2 , from 1.5 to 6% of Fe 2 O 3 , and from 0.1 to 1% of Co 3 O 4 , and having a compressive stress layer of from 6 to 70 μm in a depth direction from the surface.