Methylenedianiline (MDA), or more correct 4, 4'-Methylenedianiline (MDA) is a man made chemical not found in Nature. Methylenedianiline (MDA) is listed as a hazardadous, cancer causing substance in OSHA Subpart Z under 1910.1050. Methylemedianiline is listed throughout OSHA be reference to 1910.1050.