MFX01-1580-78 - Magnaflux 7HF Oil-Based Visible Magnetic Particle Suspension Aerosol (Case of 12)

Reliable Weld Crack Detection in a Can

When you are out in the field or checking a critical weld in the shop, you need a crack detection method that is fast, easy, and undeniable. Magnaflux 7HF is an oil-based visible magnetic particle suspension that comes in a convenient aerosol can, ready to help you find defects instantly. Designed for the "wet method" of magnetic particle inspection, this spray coats your workpiece with highly magnetic particles suspended in oil. When you apply a magnetic field using a yoke or magnet, these particles rush to any cracks or discontinuities, building up to form a clear, visible black line that marks the defect.

Welders and fabricators trust Magnaflux 7HF because it takes the guesswork out of inspection. It is sensitive enough to find fine fatigue cracks, shrinkage cracks, and welding defects like lack of fusion or cold laps. Because it is oil-based, it protects the part from immediate flash rusting during the test and ensures the particles don't clump up, giving you a clean read every time. It is the perfect tool for spot checks on large piping, structural steel, or machined parts where you can't drag the whole assembly to a testing bench.

Field-Ready and Code Compliant

This product isn't just for casual checks; it is fully compliant with major welding and industrial codes like ASME and ASTM. That means you can use it for certified inspections on pressure vessels, bridges, and aerospace components. The aerosol can is tough and portable, fitting easily in your truck or tool bag. The spray nozzle is designed to cover areas quickly, so you aren't wasting time pumping a bottle.

To get the best pop out of your inspection, pair 7HF with a white contrast paint. Spray the white background first, let it dry, and then apply the 7HF while magnetizing. The black particles will stand out sharply against the white paint, making it impossible to miss a crack. Whether you are doing maintenance on heavy equipment or final QC on a fabrication job, Magnaflux 7HF gives you the professional-grade results you need to sign off on your work with peace of mind. This SKU is for a case of 12 cans, so you can stock up your shop or service truck.