Astm E155 Porosity Levels Pdf Repack May 2026

ASTM E155 – officially titled "Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings" – is not just a text document. It is a combination of a written standard and a set of actual radiographs (or digital images) showing graded discontinuities.

The standard covers:

ASTM E155 governs reference radiographs used to detect discontinuities in aluminum and magnesium castings. Among the five discontinuity categories (gas holes, sand inclusions, shrinkage, internal chills, and porosity), porosity is one of the most critical for evaluating casting integrity.

This PDF repack consolidates high‑resolution digitized versions of the porosity severity levels from ASTM E155, reorganized for clarity, rapid comparison, and NDT (non‑destructive testing) training.

For a typical ASTM E155 porosity levels PDF repack, you will find 5 distinct severity levels illustrated for each type of porosity. Here is what each level represents in practical terms:

| Level | Description | Typical Disposition | |-------|-------------|----------------------| | Level 1 | Very fine, widely scattered pores – barely detectable under standard viewing conditions. | Always acceptable for most applications. | | Level 2 | Small pores, still scattered but more frequent. | Acceptable for general commercial use. | | Level 3 | Moderate pore size and frequency. The "gray area" – often requires engineering review. | Acceptable only with reduction factors. | | Level 4 | Coarse pores, frequent clustering, measurable loss of section integrity. | Usually rejectable for structural parts. | | Level 5 | Severe porosity – gross discontinuities visible without viewers. | Unacceptable for all but the lowest-grade castings. |

Once you have your "astm e155 porosity levels pdf repack" , here is the standard operating procedure (SOP) for using it effectively:

First, determine the thickness of your casting. ASTM E155 is divided into thickness ranges (e.g., up to 0.5 in, 0.5-1 in, 1-2 in). Use the wrong thickness range and your comparison is meaningless.

In the world of non-destructive testing (NDT) and casting inspection, few standards are as critical as ASTM E155. This standard governs the reference radiographs for inspection of aluminum and magnesium castings. For quality assurance managers, NDT technicians, and foundry engineers, understanding the specific porosity levels defined by this standard is non-negotiable.

However, finding a clean, organized, and usable version of the documentation—often referred to as an "ASTM E155 porosity levels PDF repack" —has historically been a challenge. Raw PDFs from standards bodies can be dense, unsearchable, or cluttered with legalese.

This article serves as a complete breakdown of ASTM E155 porosity levels, why a "repack" of this PDF is valuable, and how to interpret the radiographic severity levels for production quality control.

Having a clean, single-page visual reference (or "repack" PDF) saves massive amounts of time during First Article Inspections (FAI). Instead of flipping through 50 pages of the full ASTM volume to find the specific thickness (e.g., 1/4 inch plate) and defect type, this summary isolates the porosity charts for rapid comparison.

⚠️ Disclaimer: This "repack" is for educational and quick-reference purposes only. For official final acceptance decisions, always consult the original, current ASTM E155 standard document and adhere to your specific contract requirements.

📥 Looking for the visual comparison charts? If you have a specific question about determining a Grade 2 vs. Grade 3 threshold for rounded porosity on a 6mm wall thickness, drop a comment below. Let's discuss the interpretation! 👇 astm e155 porosity levels pdf repack

#NDT #ASTM155 #QualityControl #Casting #Aerospace #Radiography #MaterialsScience #Engineering

standard provides reference radiographs used to evaluate the severity of discontinuities, such as porosity and shrinkage, in aluminum and magnesium castings. David Publishing Discontinuity & Porosity Levels ASTM E155 defines 8 levels of severity

for different types of defects, where Level 1 represents the highest quality (lowest severity) and Level 8 represents the highest degree of allowable discontinuity. These levels are categorized by casting thickness—typically

—and include the following porosity-related classifications: Gas Porosity (Round): Voids formed by trapped gas during solidification. Gas Porosity (Elongated):

Non-spherical gas voids often appearing in clusters or strings. Shrinkage (Sponge): Porosity caused by the metal contracting as it cools. Foreign Material (Less/More Dense):

Entrapped debris that appears on radiographs differently based on its density relative to the alloy. Key Specifications for Porosity Levels

For specific defects like "Aluminum Foreign Material (More Dense)" at 3/4" thickness, the standard quantifies levels by area and diameter: m m squared the empty set m m squared the empty set m m squared the empty set m m squared the empty set m m squared the empty set

Note: For gas porosity specifically, quantification of flaw density becomes increasingly difficult for Levels 5 through 8 and often requires discussion between the manufacturer and the purchaser. Documentation & Purchasing Standard Content:

The standard is divided into Volume I (Aluminum and Magnesium) and Volume II (Magnesium specifically). Reference Radiographs:

To perform an inspection, a full set of entity plates (actual physical radiographs) must be purchased from ASTM International for visual comparison. Digital Standards:

For digital radiography (CR/DR), ASTM E2422 (Aluminum) or ASTM E2869 (Magnesium) digital reference images must be used instead of the physical plates. David Publishing acceptance criteria

commonly used by specific industries (e.g., aerospace) for these levels?

ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd Having a clean, single-page visual reference (or "repack"

The ASTM E155 standard provides reference radiographs for inspecting aluminum and magnesium alloy castings. These radiographs serve as a visual baseline for evaluating the severity of internal discontinuities like gas porosity, shrinkage, and foreign materials. Porosity Classification and Severity Levels

ASTM E155 uses a system of eight severity levels (1 to 8) to grade the degree of a discontinuity.

Level 1: Represents the highest quality with minimal, often barely detectable porosity.

Level 8: Indicates the highest concentration or largest size of the discontinuity.

Categories: Discontinuities are grouped into categories such as Category A (Gas Porosity), which includes both round and elongated types. Summary of Porosity Acceptance (Typical)

Engineering drawings often specify an "Acceptance Grade" (e.g., Grade A, B, C, or D) that correlates to these ASTM E155 levels for different casting sections. Discontinuity Type Grade B (High) Grade C (Medium) Grade D (Low) Gas Porosity (Round) Gas Porosity (Elongated) Gas Holes Shrinkage Porosity

Note: For Grade AA, typically no discontinuities are permitted. Guide to Using ASTM E155 Radiographs

ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd

ASTM E155 provides standardized reference radiographs to evaluate discontinuities like gas holes, porosity, and microshrinkage in aluminum and magnesium castings across eight severity levels. The standard defines specific radiographic plates for different material types and thicknesses, commonly used for quality inspection in the aerospace and automotive sectors. For detailed, official information on these standards, visit ASTM.

E155 Standard Reference Radiographs for Inspection ... - ASTM

The ASTM E155 standard provides reference radiographs for evaluating the quality of aluminum and magnesium castings. It establishes a framework for identifying and grading internal discontinuities like gas porosity, which are rated on a severity scale from Level 1 to Level 8. Core Grading System (Levels 1–8)

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

Level 1 (Highest Quality): Minimal porosity, often barely detectable on X-ray images. 📥 Looking for the visual comparison charts

Levels 2–4: Increasing severity; Level 3 is often the maximum allowable limit for automotive parts.

Levels 5–8 (Lowest Quality): High concentrations of defects. Multiple smaller defects at these levels are difficult to quantify individually. Typical Acceptance Criteria

Casting requirements are often tied to specific grades defined in ASTM B686 for high-performance applications: Grade B: Requires reaching Level 1 radiographic quality.

Grade C: Typically requires a frame number of Level 3 or better. Grade D: Acceptable up to Level 7. Classification of Porosity Types Porosity Type Radiographic Appearance Gas Holes

Smooth-edged dark spots, round or elongated; can occur individually or in clusters. Gas Porosity (Round)

Minute voids distributed throughout the casting, appearing as small round dots. Gas Porosity (Elongated)

Distributed minute voids with an elongated or teardrop shape. Microshrinkage

Elongated "feathery" streaks or massive "sponge" appearances between dendrites. Practical Application Tips

Thickness Ranges: Radiographs are categorized by casting thickness—specifically 1/4 inch (for thicknesses up to 1/2 inch) and 3/4 inch (for over 1/2 inch to 2 inches).

Functional Zoning: Designers often apply different levels to the same part; critical thin "arms" may require Level 1, while thicker "truck" areas might allow Level 3.

Digital Standards: For digital radiography (CR/DR), the related ASTM E2422 (aluminum) or ASTM E2869 (magnesium) should be used instead of the film-based E155.

ASTM E155 Discontinuity Levels Guide | PDF | Materials - Scribd