ISO 11971:2020

1.2 Acceptance levels utilize Bureau de Normalisation des Industries de la Fonderie (BNIF) and Steel Castings Research and Trade Association (SCRATA) or Casting Technology International (CTI) reference comparators for the visual determination of surface roughness and surface discontinuities described as follows:

— surface roughness;

— thermal dressing;

— mechanical dressing;

— non-metallic inclusions;

— gas porosity;

— fusion discontinuities;

— expansion discontinuities;

— metal inserts.