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Note: If your wall thickness differs from the reference, you must use the "penetrameter sensitivity" or equivalent thickness tables found in the repacked appendix.

Your component wall thickness determines which reference radiograph to use. ASTM E155 provides separate plates for:

Here is a brief summary of the porosity levels:

ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd

Appears as round or elongated dark spots. These are typically minute voids distributed throughout the entire casting.

"Blind porosity" (viods open to only one surface) can trap cleaning solutions, leading to corrosion or bubbling during secondary treatments like powder coating. Digital Inspection Standards

The reference radiographs are divided into sets based on the casting wall thickness:

The standard uses "frame numbers" or levels to indicate the concentration and size of defects.

For professionals requiring access to ASTM E155 porosity levels information, several legitimate purchasing options exist:

If utilizing digital reference software, ensure your monitors meet the minimum nit/luminance requirements specified by ASTM E2422 or ASTM E155 digital supplements.

Here is a comprehensive guide to understanding ASTM E155 porosity levels, acceptance criteria, and how repackaged PDF documentation is used in modern industrial quality control. What is ASTM E155?

Microshrinkage having an elongated appearance resembling feather-like streaks. 4. Microshrinkage (Sponge Type)

Using unauthorized or heavily compressed PDF copies for final safety sign-offs can lead to critical auditing failures, loss of facility accreditation, or missed structural defects.