# NIOSH Pocket Guide to Chemical Hazards
p-Phenylene diamine | CAS 106-50-3
C6H4(NH2)2 | RTECS SS8050000
Synonyms & Trade Names 4-Aminoaniline; 1,4-Benzenediamine; p-Diaminobenzene; 1,4-Diaminobenzene; 1,4-Phenylene diamine | DOT ID & Guide 1673 153
Exposure Limits | NIOSH REL: TWA 0.1 mg/m3 [skin]
OSHA PEL: TWA 0.1 mg/m3 [skin]
IDLH 25 mg/m3 | Conversion
Physical Description White to slightly red, crystalline solid.
MW: 108.2 | BP: 513°F | MLT: 295°F | Sol(75°F): 4%
VP: <1 mmHg | IP: 6.89 eV |  | Sp.Gr: ?
Fl.P: 312°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods OSHA 87
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 2.5 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£ Up to 5 mg/m3: (APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 25 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode Emergency or planned entry into unknown concentrations or IDLH conditions: (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 canister providing protection against the compound of concern and 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 pharynx, larynx; bronchial asthma; sensitization dermatitis
Target Organs respiratory system, skin
See also: INTRODUCTION