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Nitric oxide

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Synonyms & Trade Names
Mononitrogen monoxide, Nitrogen monoxide
CAS No.
10102-43-9
RTECS No.
QX0525000
DOT ID & Guide
1660 124
Formula
NO
Conversion
1 ppm = 1.23 mg/m3
IDLH
100 ppm
See: 10102439
Exposure Limits
NIOSH REL
TWA 25 ppm (30 mg/m3)
OSHA PEL
TWA 25 ppm (30 mg/m3)
Measurement Methods
NIOSH 6014;
OSHA ID190
See: NMAM or OSHA Methods
Physical Description
Colorless gas. [Note: Shipped as a nonliquefied compressed gas.]
Molecular Weight
30.0
Boiling Point
-241°F
Freezing Point
-263°F
Solubility
5%
Vapor Pressure
34.2 atm
Ionization Potential
9.27 eV
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Relative Gas Density
1.04
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.]
Exposure Routes
inhalation
Symptoms
irritation eyes, wet skin, nose, throat; drowsiness, unconsciousness; methemoglobinemia
Target Organs
Eyes, skin, respiratory system, blood, central nervous system
Personal Protection/Sanitation
(See protection codes)
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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 1311   MEDICAL TESTS: 0159
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health