MR®304 – Water Conditioner

MR®304 is a general-purpose blend of wetting agents, corrosion inhibitors and anti-forming agents water-conditioning powder to enhance surface wetting and magnetic particle dispersion stability in water-based magnetic particle suspensions. It is added to the water bath and mixed until dissolved prior to addition of magnetic powder (oil & water based).

SKU Pack Size Case Size
2511-0039 Bulk 1 kg 6


Additional information


Appearance – white granular powder
Chemical Composition – mixture of wetting agent, anti-foam emulsion & corrosion inhibitor
Basis – borax
Odour – odourless


ASTM E1444/1444M

Family Testing

compatible with all the MR® range of Magnetic powder (oil & water)


  • Odourless
  • White granular powder with no self fluorescence
  • Superior wetting - provides excellent particle mobility
  • Optimal short term corrosion protection
  • Does not flash
  • Excellent anti-foam properties

How it Works

Magnetic particle inspection (MPI) is a non-destructive testing (NDT) method used to detect surface and slightly subsurface cracks in ferromagnetic materials such as iron, steel, and nickel. The process involves magnetizing the part to be inspected and then applying appropriate magnetic particles in the form of a dry powder or suspension to the surface of the part. The magnetic particles are attracted to areas of flux leakage, which are areas where the magnetic field is distorted by the presence of a crack or other defect creating a visible indication that can be used to identify and evaluate the nature and extent of the defect.

The application of the magnetic powder creates a visible indication of the location and shape of the crack or other defect. The powder accumulates at the location of the defect, forming a visible indication or "magnetic particle indication." This indication is then examined by a trained inspector using ultraviolet light or other illumination to identify the precise location, size, and orientation of the defect.


Aerosol UN Model Regulation - UN 1950 AEROSOLS, 2.1 Bulk UN Model Regulation – UN 1263 PAINT, 3, II


Q: What is MPI testing?  A: MPI (Magnetic Particle Inspection) testing is a non-destructive testing method used to detect surface and slightly subsurface defects in ferromagnetic materials such as iron, nickel, and cobalt. It is commonly used in industries such as aerospace, automotive, and oil and gas. Q: Are there various kinds of black inks available?  A: Yes, there are different versions of black ink avaiable depending on the form and suspension liquid. Q: What is the difference between the various versions of MR76S?  A: MR76S comes in various versions (Version A, B, C, D, S) depending on the sediment levels. The standard MR76S (Version A) comes with a sediment of 1.2-2.4 ml/100ml (1 h) according to the ASME standard. Q: How is the black ink applied during MPI testing?  A: The black ink is typically applied to the surface being inspected by either spraying or brushing it on. Q: Is the black ink used in MPI testing safe?  A: Yes, the black ink used in MPI testing is generally safe to use. However, it is important to follow the manufacturer's instructions and safety precautions when handling and using the ink. An oil free version of MR76S is available as MR76SR. Q: Can other colors be used instead of black ink in MPI testing?  A: Yes, other colors such as red, blue, and green can be used in MPI testing. However, black ink is the most commonly used color because it provides the highest contrast and is therefore the easiest to interpret. Q: What happens if MR76S is oversprayed? A: MR76S is designed to offer excellent particle mobility reducing the background even when oversprayed. Q: What is Super Wetting Technology (SWT) in MR76S? A: SWT is a proprietary technology used in preparing MR76S which enhances the particle mobility, reduces the background, super wets the carrier media for quick indications and increases particle build-up, thereby increasing the sensitivity significantly.