NIOSH Pocket Guide to Chemical Hazards

Nitromethane CAS 75-52-5
CH3NO2 RTECS PA9800000
Synonyms & Trade Names
DOT ID & Guide
1261 129
NIOSH REL: See Appendix D
OSHA PEL: TWA 100 ppm (250 mg/m3)
IDLH 750 ppm Conversion 1 ppm = 2.50 mg/m3
Physical Description
Colorless, oily liquid with a disagreeable odor.
MW: 61.0
BP: 214°F
FRZ: -20°F
Sol: 10%
VP: 28 mmHg
IP: 11.08 eV

Sp.Gr: 1.14
Fl.P: 95°F
UEL: ?
LEL: 7.3%

Class IC Flammable Liquid: Fl.P. at or above 73F and below 100F.
Incompatibilities & Reactivities
Amines; strong acids, alkalis & oxidizers; hydrocarbons & other combustible materials; metallic oxides [Note: Slowly corrodes steel & copper when wet.]
Measurement Methods
NIOSH 2527
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations OSHA
Up to 750 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece
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: Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Dermatitis; in animals: irritation eyes, respiratory system; convulsions, narcosis; liver damage
Target Organs Eyes, skin, central nervous system, liver