# NIOSH Pocket Guide to Chemical Hazards
Nitromethane | CAS 75-52-5
CH3NO2 | RTECS PA9800000
Synonyms & Trade Names Nitrocarbol | DOT ID & Guide 1261 129
Exposure Limits | 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 73°F and below 100°F.
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
See also: INTRODUCTION