7C Black Wet Method Colored Nonfluorescent Magnetic Particles

7C Black (25lb, 11.34 kg pail)

Item #: 01-1116-81
7C Black 25lb bucket

7C Black

Wet Method Colored Nonfluorescent Magnetic Particles

7C Black is a highly-sensitive magnetic particle powder for nonfluorescent (visible) wet method magnetic particle testing. Particle suspensions prepared with 7C Black provide clear, strong indications and are ideal for locating fine and medium discontinuities on finished parts.

7C Black can be mixed with water or oil and used to find inclusions, seams, shrink cracks, tears, laps, flakes, welding defects, grinding cracks, quenching cracks, fatigue cracks and other defects.

Use with WCP-2 white contrast paint to improve probability of detection and sensitivity.


  • Clear indications under visible light
  • Heavy particle buildup for quick detection
  • Can be suspended in water or petroleum distillate (oil) vehicle
  • Great particle mobility

Product Properties

NDT Type: Visible Magnetic Particle Testing

Particle Suspension Vehicle: Petroleum Distillate (Oil), Water

Required Equipment: Magnetizing device


Ideal Application: Detecting fine and medium discontinuities, Difficult to reach areas, Field testing, In-service inspections, Light surfaces, Machined parts, Reflective or light-colored surfaces, Spot inspections

Defect Examples: Fatigue cracks, Grinding cracks, Inclusions, Laps, Quenching cracks, Seams, Shrink cracks, Tears, Welding defects



Standards: AMS 3042, ASME, ASTM E1444, ASTM E709, NAVSEA 250-1500-1, NAVSEA T9074-AS-GIB-010/271



Product Data Sheet

Safety Data Sheet

Magnetic Particle Process Guide