Surface roughness

Casting defect if the metal penetration of the sand mold is in the size range of the sand grains at maximum (see Sand grain).

For sand casting and shell casting, the roughness depth (Fig. 1)generally depends on the grain of the used mold material. Instead of direct measurements of the castingsurface roughness, standardized surfaces according to DIN EN 1370 are often applied for examination of the surface roughness (see Surface quality) by means of comparators (Fig. 2).

Additional references:
Mold sand-based casting defect
Rough surface


  • Fig. 1: Example of a blasted unprocessed casting surface with respective roughness due to too coarse sand grain
  • Fig. 2:  Standardized surfaces according to DIN EN 1370