The "Reference Photographs" are the core of this standard. Low-quality scans in a pirated PDF often lose the detail necessary to accurately compare a real-world flaw to the reference.
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The official ASTM E125 document provides specific "degrees" of severity (1 through 5) for each type of flaw. Having the high-fidelity original is the only way to ensure your casting meets the specific safety "Grade" required by your client or regulatory body. Conclusion The "Reference Photographs" are the core of this standard