# NIOSH Pocket Guide to Chemical Hazards
Nitric oxide | CAS 10102-43-9
NO | RTECS QX0525000
Synonyms & Trade Names Mononitrogen monoxide, Nitrogen monoxide | DOT ID & Guide 1660 124
Exposure Limits | NIOSH REL: TWA 25 ppm (30 mg/m3)
OSHA PEL: TWA 25 ppm (30 mg/m3)
IDLH 100 ppm | Conversion 1 ppm = 1.23 mg/m3
Physical Description Colorless gas. [Note: Shipped as a nonliquefied compressed gas.]
MW: 30.0 | BP: -241°F | FRZ: -263°F | Sol: 5%
VP: 34.2 atm | IP: 9.27 eV | RGasD: 1.04 |
Fl.P: NA | UEL: NA | LEL: NA |
Nonflammable Gas, but will accelerate the burning of combustible materials.
Incompatibilities & Reactivities Fluorine, combustible materials, ozone, NH3, chlorinated hydrocarbons, metals, carbon disulfide [Note: Reacts with water to form nitric acid. Rapidly converted in air to nitrogen dioxide.]
Measurement Methods NIOSH 6014; OSHA ID190
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation | First Aid (See procedures) Breathing: Respiratory support
Respirator Recommendations NIOSH/OSHA Up to 100 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern¿/(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern*¿/(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¿/(APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus 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: (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¿/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation
Symptoms Irritation eyes, wet skin, nose, throat; drowsiness, unconsciousness; methemoglobinemia
Target Organs Eyes, skin, respiratory system, blood, central nervous system
See also: INTRODUCTION