Nitrogen dioxide
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Synonyms & Trade Names
Dinitrogen tetroxide (N2O4), Nitrogen peroxide
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CAS No.
10102-44-0
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RTECS No.
QW9800000
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DOT ID & Guide
1067 124
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FormulaNO2
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Conversion
1 ppm = 1.88 mg/m3
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IDLH
20 ppm
See: 10102440
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Exposure Limits
NIOSH REL: ST 1 ppm (1.8 mg/m3)
OSHA PEL†: C 5 ppm (9 mg/m3)
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Measurement Methods
NIOSH 6014;
OSHA ID182
See: NMAM or OSHA Methods |
Physical Description
Yellowish-brown liquid or reddish-brown gas (above 70°F) with a pungent, acrid odor.
[Note: In solid form (below 15°F) it is found structurally as N2O4.]
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MW: 46.0
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BP: 70°F |
FRZ: 15°F |
Sol: Reacts |
VP: 720 mmHg |
IP: 9.75 eV |
Sp.Gr: 1.44 (Liquid at 68°F) |
Fl.P: NA |
UEL: NA |
LEL: NA |
RGasD: 2.62 |
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| Noncombustible Liquid/Gas, but will accelerate the burning of combustible materials. |
Incompatibilities & Reactivities
Combustible material, water, chlorinated hydrocarbons, carbon disulfide, ammonia
[Note: Reacts with water to form nitric acid.] |
Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
irritation eyes, nose, throat; cough, mucoid frothy sputum, decreased pulmonary function, chronic bronchitis, dyspnea (breathing difficulty); chest pain; pulmonary edema, cyanosis, tachypnea, tachycardia
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Target Organs
Eyes, respiratory system, cardiovascular system
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Personal Protection/Sanitation
(See protection codes)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash, Quick drench |
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately |
Respirator Recommendations
NIOSH Up to 20 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:
(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
See ICSC CARD: 0930
See MEDICAL TESTS: 0164
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