Patent ID: 8403028

Claim:
A method for producing a water soluble salt core for castings, the method comprising: providing a water soluble salt(s); mixing the water soluble salt(s) with between approximately 0.5 to 10 wt.-% of a binder and between approximately 1 and 10 wt.-% of a parting agent comprising graphite so as to provide a mixture, both based on a total weight of the mixture, wherein the binder is an inorganic phosphate or a mixture of inorganic phosphates comprising at least one of a monoaluminium phosphate, a boron phosphate, and a sodium polyphosphate; compacting the mixture; and sintering the compacted mixture at approximately 200° C., wherein, the mixture is not subjected to an outgas sing at a of temperature below 700° C. during a heating process in a subsequent thermal treatment, and wherein, the mixture does not contain water.