a,EPS (polyvinylidene) prefoaming
b,Putting foams into the mold to form (foam) product model.
c,Drying the model after coating with fireproof material
d,Emdedding the product model in the sand box
e,Pouring molten cast iron
f,Taking out the casts after the model cooling
g,Cleaning the coatings on the casts
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