# NIOSH Pocket Guide to Chemical Hazards
Chlorine | CAS 7782-50-5
Cl2 | RTECS FO2100000
Synonyms & Trade Names Molecular chlorine | DOT ID & Guide 1017 124
Exposure Limits | NIOSH REL: C 0.5 ppm (1.45 mg/m3) [15-minute]
OSHA PEL†: C 1 ppm (3 mg/m3)
IDLH 10 ppm See: 7782505 | Conversion 1 ppm = 2.90 mg/m3
Physical Description Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
MW: 70.9 | BP: -29°F | FRZ: -150°F | Sol: 0.7%
VP: 6.8 atm | IP: 11.48 eV | RGasD: 2.47 |
Fl.P: NA | UEL: NA | LEL: NA |
Nonflammable Gas, but a strong oxidizer.
Incompatibilities & Reactivities Reacts explosively or forms explosive compounds with many common substances such as acetylene, ether, turpentine, ammonia, fuel gas, hydrogen & finely divided metals.
Measurement Methods NIOSH 6011; OSHA ID101
Personal Protection & Sanitation Skin: Frostbite Eyes: Frostbite Wash skin: No recommendation Remove: No recommendation Change: No recommendation Provide: Frostbite | First Aid (See procedures) Eye: Frostbite Skin: Frostbite Breathing: Respiratory support
Respirator Recommendations NIOSH Up to 5 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 10 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
Exposure Routes inhalation, skin and/or eye contact
Symptoms Burning of eyes, nose, mouth; lacrimation (discharge of tears), rhinorrhea (discharge of thin mucus); cough, choking, substernal (occurring beneath the sternum) pain; nausea, vomiting; headache, dizziness; syncope; pulmonary edema; pneumonitis; hypoxemia (reduced oxygen in the blood); dermatitis; liquid: frostbite
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION