Casting system and a method of casting using the same

A casting system for the manufacture of a cast item by pouring molten casting material in a casting mold, the casting system comprising:

• a casting surface for positioning the casting mold thereon;
• a rim area disposed on the casting surface;
• a heat resistant impermeable diaphragm having a predetermined heat resistance coefficient and an edge area, the heat resistant impermeable diaphragm configured for covering a portion of the casting mold when the latter is positioned on the casting surface so as to form a casting space defined by at least a base constituted by the casting surface and at least a casting face constituted, at least in part, by the heat resistant impermeable diaphragm;
• a sealing arrangement configured for sealingly engaging the rim area of the casting surface and the edge area of the heat resistant impermeable diaphragm, thereby sealing the casting space;
• and
• at least one outlet configured for withdrawing gas from the sealed casting space;
• wherein the heat resistance coefficient is such that the heat resistant impermeable diaphragm can melt when coming in contact with the molten casting material;
• wherein the heat resistant impermeable diaphragm covers an area larger than that through which molten material is cast so that, when the casting space is sealed, application of vacuum to the sealed casting space through the at least one outlet causes the heat resistant impermeable diaphragm to adhere to a portion of the casting mold located juxtaposed with the casting face.