NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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 See: 10102439
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
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   See ICSC CARD: 1311   See MEDICAL TESTS: 0159