Pinholes or Gas
Technical Support
Struggling with a specific casting defect or just need general technical support?
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Bubble-shape cavities located on top side of parts when the tree is in casting position
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Indicates that there was unburned wax pattern residue (soot or ash) in the shell; when molten metal was poured into the shell cavity and came into contact with the ash residue, gas was formed and trapped in the mold