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NIOSH
Pocket Guide
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Ammonia |
CAS 7664-41-7 |
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NH3 |
RTECS BO0875000 |
Synonyms & Trade Names
Anhydrous ammonia, Aqua ammonia, Aqueous ammonia [Note: Often
used in an aqueous solution.] |
DOT ID & Guide
1005 125 (anhydrous)
2672 154 (10-35% solution)
2073 125 (>35-50% solution)
1005 125 (>50% solution) |
Exposure
Limits |
NIOSH REL: TWA 25 ppm (18 mg/m3)
ST 35 ppm (27 mg/m3) |
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OSHA PEL†: TWA 50 ppm (35 mg/m3)
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IDLH 300 ppm |
Conversion 1 ppm = 0.70 mg/m3
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Physical Description
Colorless gas with a pungent, suffocating odor. [Note: Shipped
as a liquefied compressed gas. Easily liquefied under pressure.]
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MW: 17.0
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BP: -28°F
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FRZ: -108°F
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Sol: 34%
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VP: 8.5 atm
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IP: 10.18 eV
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RGasD: 0.60
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Fl.P: NA (Gas)
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UEL: 28%
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LEL: 15%
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[Note: Although NH3 does not
meet the DOT definition of a Flammable Gas (for labeling purposes),
it should be treated as one.] |
Incompatibilities & Reactivities
Strong oxidizers, acids, halogens, salts of silver & zinc [Note:
Corrosive to copper & galvanized surfaces.] |
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated (solution)
Remove: When wet or contaminated (solution)
Change: No recommendation
Provide: Eyewash (>10%), Quick drench (>10%)
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First Aid
Eye: Irrigate immediately (solution/liquid)
Skin: Water flush immediately (solution/liquid)
Breathing: Respiratory support
Swallow: Medical attention immediately (solution)
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Respirator Recommendations NIOSH
Up to 250 ppm: (APF = 10) Any chemical cartridge
respirator with cartridge(s) providing protection against the
compound of concern*/(APF = 10) Any supplied-air respirator*
Up to 300 ppm: (APF = 25) Any supplied-air
respirator operated in a continuous-flow mode*/(APF = 25) Any
powered, air-purifying respirator with cartridge(s) providing
protection against the compound of concern*/(APF = 50) Any chemical
cartridge respirator with a full facepiece and 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 = 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
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Exposure Routes inhalation,
ingestion (solution), skin and/or eye contact (solution/liquid)
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Symptoms Irritation eyes, nose,
throat; dyspnea (breathing difficulty), wheezing, chest pain;
pulmonary edema; pink frothy sputum; skin burns, vesiculation;
liquid: frostbite |
Target Organs Eyes, skin,
respiratory system
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