Ammonia - NIOSH Pocket Guide To Chemical Hazards - CDC

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Ammonia Minus Related Pages Synonyms & Trade Names Anhydrous ammonia, Aqua ammonia, Aqueous ammonia [Note: Often used in an aqueous solution.] CAS No. 7664-41-7 RTECS No. BO0875000 DOT ID & Guide 1005 125(anhydrous)2672 154(10-35% solution)2073 125(>35-50% solution)1005 125(>50% solution) FormulaNH₃ Conversion 1 ppm = 0.70 mg/m3 IDLH 300 ppmSee: 7664417 Exposure Limits

NIOSH REL

TWA 25 ppm (18 mg/m3) ST 35 ppm (27 mg/m3)

OSHA PEL

TWA 50 ppm (35 mg/m3) See Appendix G Measurement Methods NIOSH 3800 , 6015 , 6016; OSHA ID188 See: NMAM or OSHA Methods Physical Description Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.] Molecular Weight17.0 Boiling Point-28°F Freezing Point-108°F Solubility34% Vapor Pressure8.5 atm Ionization Potential10.18 eV Flash PointNA (Gas) Upper Explosive Limit28% Lower Explosive Limit15% Relative Gas Density0.60 [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.] Exposure Routes inhalation, ingestion (solution), skin and/or eye contact (solution/liquid) 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 Personal Protection/Sanitation (See protection codes) 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%) First Aid (See procedures) Eye:Irrigate immediately (solution/liquid) Skin:Water flush immediately (solution/liquid) Breathing:Respiratory support Swallow:Medical attention immediately (solution) 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 concernAny appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also INTRODUCTION ICSC CARD: 0414 MEDICAL TESTS: 0013 Page last reviewed: October 30, 2019 Content source: National Institute for Occupational Safety and Health home NIOSH Pocket Guide to Chemical Hazards

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