Table 3-7. Magnetic Rubber Equipment

Figure 3-75. Preparation for Magnetic Rubber Inspection

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 3-116 Table 3-7. Magnetic Rubber Equipment. Electromagnetic yokes, fixed or articulated leg (same as used for magnetic particle inspection Permanent bar magnets Soft iron pole pieces Stereo zoom microscope (7-10X) with light Dial probe gaussmeter Electronic gaussmeter Table 3-8. Magnetic Rubber Inspection Materials. Base material Dibutyltin Dilaurate and Stannous Octoate catalysts. Sealing compound (putty for forming dams) Aluminum or plastic sheet material for forming dams Lubricant (release agent) to aid in the removal of replicas from holes Paper cups in which to mix magnetic rubber material Tongue depressors for mixing the material Isopropyl alcohol for cleaning replicas Hypodermic disposable syringe for applying the rubber mixture to the inspection area b. Prepare part for magnetic rubber inspection as follows: (1) Using cheesecloth or equivalent moistened with cleaning solvent MIL-C-38736 or equivalent, remove grease, oil, dirt, lint, and similar contaminants from the area to be inspected. (2) Remove paint topcoat or fuel tank coating, as appropriate, and primer coat and/or plating as required. CAUTION If a delay is expected that would leave any area of steel in a bare metal state for over 1 hour, coat the area with corrosion preventive compound, Mil-C-16173, Grade 3. The exterior topcoat or fuel tank coating shall be removed from the surfaces of holes to be inspected. The primer coat may be left on unless a specific procedure requires that it be removed or unless the total thickness of the primer plus plating is greater than 0.005 inches. NOTE When building dams, make certain they are small enough to allow magnets or the legs of an electromagnet to span the reservoir. Magnets or the legs of an electromagnet should never be placed into the uncured magnetic rubber. Using the procedures and materials as discussed above, virtually any area or configuration can be prepared for magnetic rubber inspection. Upside-down surfaces may be inspected by building a reservoir beneath the test area and pressure filling with magnetic rubber. This type of reservoir must be provided with a vent hole to prevent air entrapment.

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