Description: HM-604 is a level 3, Method A water washable fluorescent penetrant for inspecting castings, extrusions and similar parts.

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HM-604 is a versatile, general purpose penetrant for use on a variety of materials, including aluminum and magnesium. Complies with low sulfur and low halogen requirements. HM-604 has been used by aerospace, airframe, turbine engine and missile manufacturers for over a decade.

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