ASTM International Standard Practices for Production and Preparation of Gray Iron Castings for Porcelain Enameling ASTM C660-24

These practices are intended for production and preparation of gray iron castings for porcelain enamelling. Design of the casting should be such as to minimize variations in temperature during firing and cooling. The governing factors in pattern layout and shop control are elimination of discontinuities, chill, and inclusions at or near the surfaces to be coated. Visual inspection methods for enamelling surfaces should place emphasis on the detection and remedy of porosity, sand inclusions, and gas holes. Porosity consisting of essentially subsurface pinholes, shallow covered blows, body scars, or shrinkage near the surface may or may not be acceptable for correction, depending upon severity.