It has the strongest compressive and tensile strength out of all the linings, thus it can withstand amalgam condensation in high stress bearing areas such as class II cavities. GI is used as a lining material as it is very compatible with most restorative materials, insulates thermally and electrically and adheres to enamel and dentine. Lining GI contains glass of smaller particle sizes in comparison to its adhesive restorative mix to allow formation of a thinner film. Some variations are also radiopaque which makes it good for X ray cavity detection. In addition, GI is bacteriostatic due to its fluoride release from un-reacted glass cores.