The standard arranges discontinuities in ascending order of severity. For example:
ASTM E155 provides standardized, film-based reference radiographs to grade internal discontinuities—such as gas holes, shrinkage, and inclusions—in aluminum and magnesium castings for aerospace and automotive applications. The standard defines severity levels for castings up to 2 inches thick across two volumes of reference plates. Review the full specification at ASTM International .
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