ASTM E1444/E1444M-25 PDF

Full title and description

ASTM E1444/E1444M-25 — Standard Practice for Magnetic Particle Testing for Aerospace. This combined (SI and inch‑pound) practice establishes minimum requirements for performing magnetic particle inspection on ferromagnetic aerospace hardware using primarily the wet fluorescent method; it defines the method scope, required controls, and criteria for detection and interpretation of surface and slightly subsurface discontinuities.

Abstract

This practice specifies the basic parameters for magnetic particle testing used in aerospace applications (wet fluorescent method). It covers magnetization methods, particle application, interpretation of particle indications, and minimum process controls; it is intended to be specified on drawings or contracts and must be supplemented by a detailed written procedure for examination personnel. Guide E709 and Practice E3024/E3024M are referenced for tutorial and industrial application complements. The standard replaces MIL‑STD‑1949 and is issued as a combined SI/inch‑pound document.

General information

• Status: Active.
• Publication date: May 1, 2025.
• Publisher: ASTM International.
• ICS / categories: 77.040.20 (Non‑destructive testing of metals).
• Edition / version: E1444/E1444M‑25 (2025).
• Number of pages: 15.

Scope

The practice establishes minimum requirements for magnetic particle testing to detect surface or slightly subsurface discontinuities in ferromagnetic materials for aerospace use, with emphasis on the wet fluorescent technique. It applies to raw materials, finished and semi‑finished parts, welds, and in‑service components; it does not apply to non‑ferromagnetic alloys (for example austenitic stainless steels), and portable battery‑powered electromagnetic yokes are specifically outside the scope unless otherwise agreed. The practice is intended to be used with supplemental written procedures and may be invoked by contract or engineering drawing.

Key topics and requirements

• Fundamental magnetization methods and selection of magnetizing techniques appropriate to part geometry and discontinuity orientation.
• Application and control of magnetic particles (wet fluorescent technique), including particle concentration, carrier fluid, dwell time, and illumination requirements for fluorescent techniques.
• Interpretation and evaluation of indications — criteria for accept/reject and documentation of findings.
• Minimum procedure content: the practice is a specification-level document and must be supplemented by a detailed written procedure for examination personnel.
• Unit systems: issued as a combined SI and inch‑pound standard with each system regarded independently.

Typical use and users

Used by aerospace nondestructive testing (NDT) organizations, quality assurance/inspection personnel, OEM and supplier production inspectors, maintenance/repair/overhaul (MRO) facilities, and engineering organizations that specify acceptance criteria for ferromagnetic aerostructures and components. It is used to write shop procedures, acceptance criteria on drawings, and supplier quality requirements.

Related standards

Referenced and related documents include Guide E709 (magnetic particle testing tutorial), Practice E3024/E3024M (industrial magnetic particle testing), and legacy MIL‑STD‑1949 (this practice replaces that document). The standard sits within ASTM’s nondestructive testing portfolio (Book of Standards Volume 03.03) and is compatible with other international magnetic particle testing standards (for example ISO 9934 series) when used with appropriate unit and procedural conversions.

Keywords

dye, fluorescent, FP, FPI, magnetic particle, MPI, MT, NDT, nondestructive evaluation, nondestructive examination, nondestructive testing.

FAQ

Q: What is this standard?

A: ASTM E1444/E1444M‑25 is a practice that sets minimum requirements for performing magnetic particle testing in aerospace applications, with emphasis on the wet fluorescent method.

Q: What does it cover?

A: It covers magnetization methods, particle application (wet fluorescent), interpretation of indications, units, and minimum procedural content for detecting surface and slightly subsurface discontinuities in ferromagnetic materials used in aerospace. It is a specification‑level document and is not intended as a full step‑by‑step operator procedure.

Q: Who typically uses it?

A: Aerospace NDT technicians and supervisors, QA/inspection engineers, OEMs and suppliers, MRO facilities, and engineering authorities who write inspection requirements and acceptance criteria.

Q: Is it current or superseded?

A: It is current (active) as published May 1, 2025, and supersedes earlier revisions of ASTM E1444/E1444M; it also replaces MIL‑STD‑1949 where cited.

Q: Is it part of a series?

A: Yes — it is part of the ASTM nondestructive testing suite (Book of Standards Volume 03.03) maintained by Committee E07 and is intended to be used alongside related practices and guides (for example E3024/E3024M and Guide E709).

Q: What are the key keywords?

A: dye, fluorescent, magnetic particle, MPI, MT, FPI, NDT, nondestructive evaluation/examination/testing.