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  5 5  
space Inclusions in Casting Problem !  
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Inclusions in casting problem are a science problem and can notice by physical on the material may discoloration, popcorn shape and rough surface grain.
Please check:

1. Crucible old and deteriorating, replace the crucible.
2. Slag or oxide build up in crucible, clean or replace the crucible.
3. Foreign materials or oxides in the metal, refine the metal.

 
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