Chlorine

Synonyms & Trade Names

Molecular chlorine

CAS No.

7782-50-5

RTECS No.

FO2100000

DOT ID & Guide

1017 124

Formula

Cl₂

Conversion

1 ppm = 2.90 mg/m³

IDLH

10 ppm
See: 7782505

Exposure Limits

NIOSH REL

C 0.5 ppm (1.45 mg/m³) [15-minute]

OSHA PEL

C 1 ppm (3 mg/m³) See Appendix G

Measurement Methods

NIOSH 6011;
OSHA ID101 , ID126SGX
See: NMAM or OSHA Methods

Physical Description

Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]

Molecular Weight

70.9

Boiling Point

-29°F

Freezing Point

-150°F

Solubility

0.7%

Vapor Pressure

6.8 atm

Ionization Potential

11.48 eV

Flash Point

Upper Explosive Limit

Lower Explosive Limit

Relative Gas Density

2.47

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.

Exposure Routes

inhalation, skin and/or eye contact

Symptoms

Burning of eyes, nose, mouth; lacrimation (discharge of tears), rhinorrhea (discharge of thin nasal mucus); cough, choking, substernal (occurring beneath the sternum) pain; nausea, vomiting; headache, dizziness; syncope; pulmonary edema; pneumonitis; hypoxemia (reduced O₂ in the blood); dermatitis; liquid: frostbite

Target Organs

Eyes, skin, respiratory system

Personal Protection/Sanitation

(See protection codes)
Skin:Frostbite
Eyes:Frostbite
Wash skin:No recommendation
Remove:No recommendation
Change:No recommendation
Provide:Frostbite wash

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

Important additional information about respirator selection

Chlorine

NIOSH REL

OSHA PEL

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