Profile: MRT Castings Ltd. specializes in gravity die casting, sand casting, and high pressure die casting services. We also provide CNC machining, finishing and assembling of gravity, sand or high pressure die cast components. Gravity die casting employs cast iron molds which allow aluminum & zinc castings to be produced more accurately and cheaply, than with sand casting. Tooling costs of gravity casting are a fraction of those needed for pressure die casting. The rapid chilling gives mechanical properties, whilst non-turbulent filling ensures production of heat treatable gravity castings with minimal porosity.