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| Hydrogen chloride | CAS 7647-01-0 | ||
| HCl | RTECS MW4025000 | ||
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Synonyms & Trade Names Anhydrous hydrogen chloride; Aqueous hydrogen chloride (i.e., Hydrochloric acid, Muriatic acid) [Note: Often used in an aqueous solution.] |
DOT ID & Guide 1050 125 (anhydrous) 1789 157 (solution) |
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Exposure Limits |
NIOSH REL: C 5 ppm (7 mg/m3) | ||
| OSHA PEL: C 5 ppm (7 mg/m3) | |||
| IDLH 50 ppm | Conversion 1 ppm = 1.49 mg/m3 | ||
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Physical Description Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] |
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MW: 36.5 |
BP: -121°F |
FRZ: -174°F |
Sol(86°F): 67% |
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VP: 40.5 atm |
IP: 12.74 eV |
RGasD: 1.27 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Nonflammable Gas | |||
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Incompatibilities & Reactivities Hydroxides, amines, alkalis, copper, brass, zinc [Note: Hydrochloric acid is highly corrosive to most metals.] |
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Measurement Methods NIOSH 7903; OSHA ID174SG |
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Personal Protection & Sanitation Skin: Prevent skin contact (solution)/Frostbite Eyes: Prevent eye contact/Frostbite Wash skin: When contaminated (solution) Remove: When wet or contaminated (solution) Change: No recommendation Provide: Eyewash (solution), Quick drench (solution), Frostbite |
First Aid (See procedures) Eye: Irrigate immediately (solution)/Frostbite Skin: Water flush immediately (solution)/Frostbite Breathing: Respiratory support Swallow: Medical attention immediately (solution) |
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Respirator Recommendations
NIOSH/OSHA Up to 50 ppm: (APF = 10) Any chemical cartridge 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 = 25) Any powered, air-purifying respirator with cartridge(s) 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 acid gas canister/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion (solution), skin and/or eye contact | |
| Symptoms Irritation nose, throat, larynx; cough, choking; dermatitis; solution: eye, skin burns; liquid: frostbite; in animals: laryngeal spasm; pulmonary edema | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |