At Cutech, our Magnetic Particle Testing (MPI) is one of the fastest and most cost-effective non-destructive testing (NDT) methods for detecting surface and near-surface flaws in ferromagnetic materials. Our certified technicians bring extensive experience across sectors such as oil and gas, marine, construction and manufacturing.

What is Magnetic Particle Testing?


Magnetic Particle Testing Principle Explained

The magnetic particle testing principle involves magnetising a ferromagnetic material and applying magnetic particles to the surface; any discontinuity, such as a crack, disrupts the magnetic field and causes the particles to gather, forming a visible indication.

MPI Test Process Step-by-Step

The MPI test process typically includes the following:

1. Surface cleaning

2. Magnetisation of the test area

3. Application of magnetic particles (wet or dry)

4. Observation under appropriate lighting conditions

5. Demagnetisation and final clean-up

This magnetic particle testing method is quick to perform and ideal for repeat inspections.

Equipment Used in MPI Test Methods

At Cutech, our experienced technicians use a range of specialist tools for MPI tests, including the following:

  • Portable yokes for on-site inspections
  • Bench units for higher-volume shop work
  • UV lamps for fluorescent testing
  • Magnetic powders and liquids (wet and dry)

Magnetic Particle Testing: Standards and Certifications

All MPI tests at Cutech are carried out by ISO 9712, ASNT or PCN-certified NDT Level II and III technicians in accordance with international magnetic particle testing standards, including ASTM E444, ASME Section V and ISO 9934.

Book Magnetic Particle Testing Services

Applications of Magnetic Particle Testing

Common Industries Using MPI

Magnetic particle testing is commonly used in oil and gas, shipbuilding and marine, structural steel fabrication, power generation and rail and automotive manufacturing.

At Cutech, we work with a number of clients across these industries to provide reliable, standards-compliant MPI test services that support both asset integrity and safety.

Application of Magnetic Particle Testing in Welding, Forgings, and Castings

Our application of magnetic particle testing includes weld inspections, forgings, castings and other ferromagnetic components and is particularly useful for detecting cracks in weld beads, surface-breaking flaws in forgings, and defects on machined or coated parts.

Enquire About MPI Testing

Advantages of Magnetic Particle Testing


Fast, Cost-Effective Surface Crack Detection

At Cutech, our clients value our magnetic particle testing service for its speed and simplicity. The test relays real-time results, making it ideal for routine inspections and production environments.

Portable Testing for In-Field and Shop Use

Our technicians can perform MPI tests both on-site and in controlled shop environments. Our portable yokes and kits make the method ideal for remote or space-constrained work areas.

High Sensitivity for Ferromagnetic Materials

MPI testing is highly sensitive and responsive for ferromagnetic metals such as carbon steel and iron. It detects tight cracks that may not otherwise be visible to the naked eye, where undetected, could cause premature failures, operational risks, and/or non-compliance with industry standards.

Discuss MPI Inspection and Testing

MPI Testing Methods We Offer


Dry vs. Wet Magnetic Particle Techniques

At Cutech, we offer both wet and dry magnetic particle testing techniques.

  • Wet method: This testing method offers better particle mobility and sensitivity, using liquid carriers.
  • Dry method: This technique is used for rough surfaces and high temperatures, with dry magnetic powders.

Fluorescent vs. Visible Particle Inspection

We utilise both fluorescent and visible particle inspection as part of our MPI test services.

Fluorescent particles are used under UV light for high-sensitivity in controlled, dark environments, whereas visible particles are applied in daylight or brightly lit settings for convenience.

Our experienced technicians select the most suitable method based on material type, inspection conditions, and required sensitivity.

Yoke Technique and Prod Method

At Cutech, we apply the yoke technique in magnetic particle testing for general purpose field inspections and the prod method where direct current contact is required for localised testing.

Contact Us to Discuss the right MPI Test Method

Full Compliance with International Standards (ASTM E1444, ASME, ISO)

We perform all magnetic particle testing in line with major codes and client-specific requirements.

Our processes ensure full compliance and reliable audit trails.

Accurate Reporting and On-Site Support

Our technicians deliver real-time results to support site-based decision making and offer comprehensive magnetic particle testing services across fabrication shops, construction sites, and operational assets.

Why Choose Cutech for MPI Services?

Certified NDT Level II and III Technicians: Our team consists of certified Level II and III NDT inspectors, all of whom are trained to internationally recognised standards in magnetic particle testing.

A robust Magnetic Particle Inspection Test Report: At Cutech, every MPI test is back by clear traceable documentation, with digital records and photographic supporting evidence included where required.

Full Compliance with International Standards (ASTM E1444, ASME, ISO): We perform all magnetic particle testing in line with major codes and client-specific requirements. Our processes ensure full compliance and reliable audit trails.

Accurate Reporting and On-Site Support: Our technicians deliver real-time results to support site-based decision making and offer comprehensive magnetic particle testing services across fabrication shops, construction sites, and operational assets.

Contact Us

Magnetic Particle Testing FAQs

Get In Touch