• Single can of Magnaflux 7HF Black Non-Fluorescent Particle aerosol, highlighting its oil-based visible magnetic particle suspension for precise inspections.
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Magnaflux

Magnaflux 7HF Black Non-Fluorescent Particles

Magnaflux 7HF Black Non-Fluorescent Particles

SKU: 01-1580-77

Stock Status: In stock
$38.95
$38.95
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Magnaflux 7HF Oil-Based Visible Magnetic Particle Suspension

Experience the precision of nonfluorescent (visible) wet method magnetic particle testing with this highly-sensitive oil-based magnetic particle suspension aerosol. Designed to provide clear, strong indications, this product is perfect for detecting fine and medium discontinuities in finished parts. Ideal for field testing, spot inspections, and situations where bulk processing is impractical, it enhances inspection capabilities in various environments.

For improved contrast and inspection sensitivity, pair the suspension with WCP-2 white contrast paint, making it an excellent choice for remote inspections of tubing, piping, and large structures.

Maximize indication detection

  • Utilize the smallest particle size available to find indications of all shapes and sizes.
  • Heavy buildup of highly magnetic particles enhances contrast, especially when combined with WCP-2 white contrast paint.
Convenient to use
  • Inspect in all conditions without the need for darkness or UV lights.
  • The aerosol format ensures easy portability for field use.
Wide application versatility
  • Inspect a diverse range of components while avoiding concerns about corrosion or specification non-conformance.
Features
  • Clear indications under visible light
  • Heavy particle buildup for better visibility
  • Excellent particle mobility
  • Corrosion protection for parts and equipment
  • Broad spray pattern for even coverage
  • Superior surface wetting
  • Very low toxicity and low odor

Use Recommendations

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

Suspension Vehicle: Carrier II (petroleum distillate)

Required Equipment: Magnetizing device

Temperature Range: 55 to 120°F / 13 to 49°C

Defect location: Surface and slightly subsurface

Ideal for:

  • Detecting fine and medium discontinuities
  • Field testing
  • Spot inspections
  • In-service inspections
  • Machined parts
  • Light surfaces
  • Difficult to reach areas

Defect examples:

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

SPECIFICATION COMPLIANCE

AMS 3043

ASTM E709

ASTM E1444

ASME BPVC

Boeing PS-21201

ISO 9934

MIL-STD-2132

NAVSEA 250-1500-1

NAVSEA T9074-AS-GIB-010/271

INSTRUCTIONS FOR USE

Use 7HF with appropriate magnetization procedure and equipment. For best results, all components, parts, or areas to be tested should be clean and dry prior to testing to provide an optimal test surface and reduce particle suspension contamination.

1. Use in a well-ventilated area.

2. For best results, apply WCP-2 before 7HF to improve contrast and inspection sensitivity.

3. Shake 7HF aerosol can well before use and occasionally during application to ensure suspension uniformity and concentration.

4. Hold the can 7 to 9 inches (18 to 24 cm) from the area to be tested.

5. Using the continuous or residual application method, spray particle suspension over the test area until it is completely covered.

6. Inspect under visible light. To verify particle concentration, perform a sensitivity check using a known test standard prior to inspection.

REMOVAL

All components, parts, or inspection areas must be properly demagnetized before cleaning to ensure easy particle removal. Cleaned parts may be treated with a temporary film protective coating if longer corrosion protection is required.

Safety Data Sheet Product Data Sheet

Frequently Asked Questions: Magnaflux 7HF Black Magnetic Particle Spray

Q: What is the benefit of using 7HF Black Magnetic Spray over dry powders?
A: Magnaflux 7HF is a "Wet Method" aerosol that provides much higher sensitivity for finding fine surface-breaking cracks than standard dry powders. Because the black particles are suspended in a high-flash point mineral oil, they move more freely to the leakage field, creating sharp, well-defined indications. For the best results on dark or machined surfaces, we recommend first applying a thin layer of WCP-2 White Contrast Paint to create a bright white background.

Q: Can 7HF be used for field inspections without a power source?
A: Yes. Unlike fluorescent particles that require a UV lamp, 7HF is a visible method particulate. When paired with a portable Magnaflux Y-2 AC Yoke, it allows technicians to perform high-sensitivity inspections in any lighting condition. This makes it the go-to choice for bridge inspections, storage tanks, and structural steel fabrication.

Q: Does Magnaflux 7HF meet major NDT specifications?
A: Absolutely. 7HF is formulated to meet all major industrial requirements, including ASTM E1444, ASTM E709, and ASME Section V. To ensure your magnetic field is strong enough to pull these particles into a clear indication, technicians often use a Magnetic Pie Gauge or Flux Indicator Strips during the testing process.

Q: How do I remove the 7HF particles and contrast paint after inspection?
A: Since 7HF is an oil-based suspension, it is best removed using a solvent cleaner or a strong degreaser. Magnaflux Spotcheck SKC-S NDT Cleaner & Remover

Q: What is the difference between 7HF and 14A Aqua-Glo?
A: The main difference is visibility. 7HF is a visible black particle seen under white light, whereas 14A Aqua-Glo is a fluorescent particle that glows bright green under a UV-A Black Light. 7HF is generally preferred for outdoor field work where controlling ambient light is difficult.

Q: What is the particle size of Magnaflux 7HF, and why does it matter?

A: Magnaflux 7HF is formulated with high-sensitivity, micro-sized black magnetic particles that average approximately 0.6 µm (microns) in diameter. This extremely fine particle size is critical for "Wet Method" inspections because it allows the particles to migrate easily to very weak magnetic leakage fields. While larger Dry Method Powders are excellent for finding larger cracks on rough castings, the fine 7HF particles are designed to detect microscopic, surface-breaking fatigue cracks and "tight" inclusions that larger particles might bridge over. To ensure these fine particles are properly distributed during testing, always shake the aerosol can thoroughly to maintain a uniform suspension.