Magnaflux Magnetic Particle #1 Gray

Colored, Non-fluorescent Magnetic Particles

#1 Gray provides strong contrast on most metal surfaces during dry method mag particle testing in visible light. It is ready-to-use for visible light flaw detection of surface and slightly subsurface discontinuities in ferrous metals. It can be used in a powder blower or shaken from a bottle during magnetization, and blown off while current is still being applied. On material with a high magnetic retentivity, indications can still be formed after the current has been turned off.


  • Sharp, color-contrast indications on high reflective surfaces
  • Ready-to-use
  • Good particle buildup for quick detection
  • Highly refined for optimal particle shape and size combination
  • Minimal dust build-up
  • Does not require a black light or darkened inspection area
  • Specifications 
  • Container Size & Part Number 
  • Applications 
  • Use Recommendations 


  • AMS 3040
  • ASTM E709
  • ASTM E1444
  • ASME
  • MIL-STD-271
  • MIL-STD-2132
  • NAVSEA 250-1500-1
  • NAVSEA T9074-AS-GIB-010/271
  • ISO 9934

Container Size & Part Number

10 lb / 4.53 kg pail      01-1716-69

45 lb / 20.4 kg pail      01-1716-87


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Defect location: surface and slightly subsurface

Ideal for:

  • Light, medium, dark surfaces
  • Detecting medium, large and course discontinuities
  • Weld testing
  • Forgings
  • Castings
  • Field testing
  • Spot inspections
  • In-service inspections
  • Large parts
  • Dark surfaces
  • Extreme temperatures
  • Rough/textured surfaces

Defect examples:

  • Inclusions
  • Seams
  • Shrink cracks
  • Tears
  • Laps
  • Flakes
  • Welding defects
  • Grinding cracks
  • Quenching cracks
  • Fatigue cracks


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Use Recommendations

NDT Method: Magnetic Particle Testing, Nonfluorescent / Visible, Dry Method

Required Equipment: Magnetizing device, powder dispenser

Temperature Range: NA to 750°F / NA to 399°C


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