Lithium disilicate

Lithium disilicate is a chemical compound. Its chemical formula is Li2Si2O5. It is a glass ceramic. They are used as dental ceramics.
Lithium disilicate has a biaxial flexible strength in the range of 360 MPa to 400 MPa. It has high hardness (5.92 +/- 0.18 GPa) and fracture toughness (3.3 +/- 0.14 MPa m1/2).