Overview
EN ISO 9934-2:2015 - Non‑destructive testing - Magnetic particle testing - Part 2: Detection media (ISO 9934-2:2015) defines the significant properties of magnetic particle testing detection media and the methods for verifying those properties. Published by CEN and aligned with ISO, this part of the ISO 9934 series covers requirements for magnetic ink, powders, carrier liquids, and contrast‑aid paints, plus test and labelling rules needed for reliable magnetic particle inspection (MPI).
Key topics and technical requirements
The standard specifies classifications, test methods and performance criteria for detection media used in MPI. Major technical topics include:
- Classification of detection media (inks, powders, carrier liquids, contrast aids).
- Testing and certificates: procedures for type testing, batch testing and in‑service testing.
- Performance requirements: mandatory checks for detection capability and stability during use.
- Colour and particle size: procedures to define and measure particle size and visual characteristics.
- Fluorescence: fluorescent coefficient measurement and stability tests for fluorescent media.
- Carrier liquid properties: viscosity, flash point, foaming behavior, and fluorescence of carrier liquids.
- Corrosion testing: methods to assess corrosion on steel and copper caused by detection media.
- Mechanical stability: long‑term (endurance) and short‑term tests of suspensions and powders.
- Chemical stability and safety: pH, sulphur/halogen content, storage stability.
- Packaging and labelling requirements and contents of the test report.
Normative references used by the standard include ISO 2160, ISO 3104, ISO 3059 and related EN/ISO terminology documents.
Practical applications
EN ISO 9934-2:2015 is essential where reliable surface and near‑surface flaw detection on ferromagnetic materials is required. Typical uses:
- MPI of welds, forgings and castings in aerospace, automotive, oil & gas, power generation, rail and heavy industry.
- Quality control in production lines where magnetic particle detection media are produced, supplied or consumed.
- Periodic in‑service checks of detection media performance to maintain consistent inspection sensitivity.
Who should use this standard
- NDT/NDE technicians and inspection teams implementing magnetic particle testing.
- Inspection and quality managers establishing MPI procedures and acceptance criteria.
- Manufacturers and suppliers of magnetic powders, inks and carrier liquids for product specification and test certification.
- Certification bodies and labs performing type, batch and in‑service testing.
Related standards
Keywords: EN ISO 9934-2:2015, magnetic particle testing, detection media, non‑destructive testing, magnetic powder, fluorescent MPI, carrier liquid, NDT standards.
