T.O. 33B-1-13-115poor surface conditions, and (4) inspection for defects that require magnification for detection andinterpretation. Magnetic rubber inspection involves the use of a material consisting of magneticparticles dispersed in a room temperature curing silicon rubber. The material is catalyzed, applied tothe test surface, and the area to be inspected is magnetized, causing the particles to migrate through therubber and accumulate at discontinuities on the surface. Following cure, the solid replica casting isremoved from the part and examined for indications.b. The magnetic principles discussed in Section 1 of this chapter apply equally to Magnetic RubberInspection.3.9.2 SafetyPrecautions.a. General safety precautions are applicable to magnetic rubber inspection. The silicon rubber, dibutyltindilaurate, stannous octoate, cure stabilizers, cleaners, and release agents are or can be skin and eyeirritants, skin sensitizers (causing allergic reactions), and inhalant and ingestion hazards. For specificinformation concerning any of the materials used as magnetic rubber, magnetic rubber catalysts, releaseagents, or cleaners consult the Material Safety Data Sheets, or contact the appropriate Safety Officer.Silicon oil is an ingredient in the material and can result in very slippery surfaces, especially floors, ifnot well controlled.b. When performing magnetic rubber inspection on aircraft using electromagnets to magnetize, theaircraft SHALL be grounded.3.9.3 GelTime,PotLifeandCureTime.Gel time is defined as the time from the addition of the catalyst to when the viscosity starts to noticeably increase. Potlife refers to the time from the addition of the catalyst to when the material can no longer be poured and magnetizationmust be completed. Cure time is the time to completely cure.3.9.4 MagneticRubberInspectionProcedure.WARNINGCleaning solvent ML-C-38736 contains aromatic naphtha, ethyl acetate, methylethyl ketone, and isopropyl alcohol. Cleaning solvent is flammable. Vapors may beharmful. Use with adequate ventilation. Avoid contact with skin and eyes.CAUTIONAreas to be magnetic rubber inspected must be free of grease, oil, dirt and otherforeign matter which could cause false or confusing indications or could prevent thebase material from curing.NOTEPrior to the initial inspection remove, as much as possible, corrosion, sealant, loosepaint, and other foreign material from the inspection area.a. Obtain the required materials and equipment. Refer to Table 3-7 and Table 3-8.
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