Zinc oxide eugenol has the lowest compressive and tensile strength in relative to the rest of the liners thus this lining should be limited to small or non stress bearing areas such as Class V cavities. This cavity lining is often used with a high strength base to provide strength, rigidity and thermal insulation. Zinc oxide eugenol can be used as linings in deep cavities without causing harm to the pulp, due to its obtundant effect on the pulp as well as its bactericidal properties due to Zinc. However eugenol may have an effect on resin based filling materials as it interferes with the polymerization and occasionally causes discoloration, thus caution should be taken when using both in tandem. It is also radio-opaque allowing fillings to be visible by X-rays.