Method of lining sheet metal casket with liquid impervious liner and casket with liner constructed by such method

A method of lining a casket with a liquid impervious liner comprises the steps of providing a casket shell having a pair of side walls, a pair of end walls and a bottom wall, providing a plastic liner having a pair of side walls, a pair of end walls and a bottom wall, inserting the liner into the casket, heating the liner to soften the liner, applying a pressure differential across the softened liner relative to the casket shell to urge the side, end and bottom walls of the softened liner into engagement with the side, end and bottom walls of the casket shell, and permitting the liner to cool. A combination casket and liner is constructed by the method.