NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




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]
Ca [15 ppm] See: 100630
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
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
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
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]
See also: INTRODUCTION   See ICSC CARD: 0938   See MEDICAL TESTS: 0184