NIOSH Pocket Guide to Chemical Hazards

Phenylhydrazine CAS 100-63-0
Synonyms & Trade Names
Hydrazinobenzene, Monophenylhydrazine
DOT ID & Guide
2572 153
NIOSH REL: Ca C 0.14 ppm (0.6 mg/m3) [2-hr] [skin] See Appendix A
OSHA PEL†: TWA 5 ppm (22 mg/m3) [skin]
IDLH Ca [15 ppm] Conversion 1 ppm = 4.42 mg/m3
Physical Description
Colorless to pale-yellow liquid or solid (below 67°F) with a faint, aromatic odor.
MW: 108.1
BP: 470°F (Decomposes)
FRZ: 67°F
Sol: Slight
VP(77°F): 0.04 mmHg
IP: 7.64 eV

Sp.Gr: 1.10
Fl.P: 190°F
UEL: ?
LEL: ?

Class IIIA Combustible Liquid Combustible Solid
Incompatibilities & Reactivities
Strong oxidizers, lead dioxide
Measurement Methods
NIOSH 3518
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: Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Skin sensitization, hemolytic anemia, dyspnea (breathing difficulty), cyanosis; jaundice; kidney damage; vascular thrombosis; [potential occupational carcinogen]
Target Organs Blood, respiratory system, liver, kidneys, skin

Cancer Site [in animals: tumors of the lungs, liver, blood vessels & intestine]