Synonyms & Trade Names4,4'-Diaminodiphenylmethane, para, para'-Diaminodiphenyl-methane, Dianilinomethane, 4,4'-Diphenylmethanediamine, MDA
DOT ID & Guide
See: IDLH INDEX
NIOSH RELCa See Appendix A
OSHA PEL[1910.1050] TWA 0.010 ppm ST 0.100 ppm
Physical DescriptionPale-brown, crystalline solid with a faint, amine-like odor.
Vapor Pressure(77°F): 0.0000002 mmHg
Ionization Potential10.70 eV
Specific Gravity1.06 (Liquid at 212°F)
Upper Exposive Limit?
Lower Explosive Limit?
Incompatibilities & ReactivitiesStrong oxidizers
Exposure Routesinhalation, skin absorption, ingestion, skin and/or eye contact
Symptomsirritation eyes; jaundice, hepatitis; myocardial damage; In Animals: heart, liver, spleen damage; [potential occupational carcinogen]
Target OrgansEyes, liver, cardiovascular system, spleen
Cancer Site[in animals: bladder cancer]
Personal Protection/Sanitation(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated/Daily
Remove:When wet or contaminated
Provide:Eyewash, Quick drench
First Aid(See procedures)
Skin:Soap wash immediately
Swallow:Medical attention immediately
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
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division