Air bubbles present as round or spherical metal defects or foam-like surface roughness. This defect indicates that the metal managed to penetrate the primary coat; that air is trapped against the wax pattern and the shell formed around it; or there was a void from an air bubble at the surface of the wax.
Struggling with a specific casting defect or just need general technical support?
Email our technical team at: Technical@ransom-randolph.com.
The causes of this defect are evident in the shell portion of the process. To cure these causes, R&R recommends taking the following actions.