DIE CASTING APPARATUS

The present invention provides improved apparatus for casting dies and the like. Basically, the apparatus comprises a container for holding molten material that is to be cast into an article, such as a die or the like, having a cavity of a desired shape formed therein; a plunger mounted for movement into and out of the container and mounting an embossed master of the desired cavity shape that can be impressed into the molten material; and seal means mounted around the outer periphery of the plunger to provide a fluid-tight seal between the plunger and the interior of the container. The seal means has a coefficient of expansion which is greater than that of the container and plunger and has a melting point which is greater than that of the material to be cast.