Temperatures in excess of 49 (120 ) may cause bursting of pressurized cans and injury to
e. Store all pressurized spray cans in a cool, dry area protected from direct sunlight. Avoid exposure of pressurized
spray cans to open flames.
Volatile fumes may occur, creating both a fire and health hazard.
f. Exercise extreme caution when handling penetrants that have been heated to a point where some lighter
constituents are driven off.
18.104.22.168 Controlling Excess Fluorescent Penetrant. After fluorescent penetrant inspection, the part shall
cleaned to ensure all penetrant is removed from the part. This shall include removing the penetrant from cracks as much
as possible before disposition of the part. This can be easily accomplished by performing cleaning operations under a
1.4.8 Magnetic Particle (MT) Method.
Magnetic particle inspections shall be performed in accordance with the general application and
techniques in TM 55-1500-335-23 (Nondestructive Inspection Methods manual) and the specific
requirements of this technical manual.
During magnetic particle inspections performed with portable equipment, the operator shall keep
the can of magnetic particle media constantly agitated by continuously shaking the can prior to
Magnetic particle is a method of detecting cracks or other flaws on the surface or near surface of materials that are
ferromagnetic. This method will produce good indications of discontinuities provided the part is free from grease, oil,
loose scale, or other surface contaminants. The inspection is accomplished on either assembled or disassembled parts.
As specified in the procedure, the inspection is accomplished by inducing a magnetic field in the part and applying a
liquid suspension of iron oxide particles to the surface to be inspected. By controlling the direction of the magnetic flux,
the lines of magnetic force shall be positioned perpendicular to the suspected crack or flaw. All magnetic particle
inspections in this manual shall be of the wet continuous method using fluorescent magnetic particles.