Non Magnetic casting

We intend to manufacture investment casting of Aluminium.
We are looking for a non magnetic type. How to get a non magnetic casting.

Is it possible to take of magnetism by some heat treatment process.

 

[AlanD]

I'm not sure what you require to be non magnetic.

Aluminium has no ferromagnetic (ordinary type of magnetism) properties.

 

[arunmrao]

How is magnetism imparted to aluminium while investment casting? It is not clear. Please alternately check the quality of aluminium if it is contaminated with iron.
Arun Rao