# NIOSH Pocket Guide to Chemical Hazards
4,4'-Methylenedianiline | CAS 101-77-9
CH2(C6H4NH2)2 | RTECS BY5425000
Synonyms & Trade Names 4,4'-Diaminodiphenylmethane; para, para'-Diaminodiphenyl-methane; Dianilinomethane; 4,4'-Diphenylmethanediamine; MDA | DOT ID & Guide
Exposure Limits | NIOSH REL: Ca See Appendix A
OSHA PEL: [1910.1050] TWA 0.010 ppm ST 0.100 ppm
IDLH Ca [N.D.] | Conversion
Physical Description Pale-brown, crystalline solid with a faint, amine-like odor.
MW: 198.3 | BP: 748°F | MLT: 198°F | Sol: 0.1%
VP(77°F): 0.0000002 mmHg | IP: 10.70 eV |  | Sp.Gr: 1.06 (Liquid at 212°F)
Fl.P: 374°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 5029
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes; jaundice, hepatitis; myocardial damage; in animals: heart, liver, spleen damage; [potential occupational carcinogen]
Target Organs Eyes, liver, cardiovascular system, spleen Cancer Site [in animals: bladder cancer]
See also: INTRODUCTION See ICSC CARD: 1111