MR 221 GF is a ready-mixed magnetic powder suspension for wet method (MPI) used to detect surface cracks and light subsurface damage in ferromagnetic materials. The black suspension provides clear visual indication in white light, and is part of MR Chemie's ECO-Line – with a mild odor and adapted to standardized quality requirements.

Key features and benefits

• Crystal clear black indicator powder: provides clear defects in contrast to the material.

• Ready-to-use solution: no additional dilution required before use.

• High sensitivity thanks to particle size of approximately 1-3 µm , which makes it possible to see very fine fractures or cracks.

• Stable suspension: settling volume after 30 minutes is between approximately 0.6-0.8 ml per 100 ml of liquid, ensuring that the powder remains well distributed during inspection.

• ECO-Line certification: free from declared hazardous ingredients, mild odor, meets regulations for safe use and handling.

Technical specifications

• Particle size: approx. 1-3 µm

• Indication type: black in white light (non-fluorescent)

• Deposit volume: approximately 0.6-0.8 ml / 100 ml after 30 minutes

• Standards / Approvals: EN ISO 9934-2, ASME B & PV Code Sec V, ASME Code V Art. 7, RCC-M

• Delivery forms: aerosol can (compressed air) 300 ml and bulk containers of 5 liters

• Odor: mild

Areas of application

• Inspection of welds, components and metal surfaces where surface defects and cracks need to be visually identified.

• Industrial inspections in mechanical engineering, shipbuilding, construction and maintenance, where white light method for magnetic particle examination is standard.

• Field and workshop use where pre-mixed suspension provides fast and reliable results without the need for extensive preparation.