Widely used in aerospace on magnesium, aluminum and titanium castings and extrusions. More sensitive than HM-3A. Also in spray cans.

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 HM-406 Fluorescent Penetrant is a medium-high sensitivity, water-washable fluorescent penetrant for inspecting castings, extrusions, and similar parts. Designed for dip tank use with good self-developing properties. It is a versatile, general purpose penetrant for use on a variety of materials, including aluminum and magnesium castings. Complies with low-sulfur and low-halogen requirements.


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