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Phosgene

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Synonyms & Trade Names
Carbon oxychloride, Carbonyl chloride, Carbonyl dichloride, Chloroformyl chloride
CAS No.
75-44-5
RTECS No.
SY5600000
DOT ID & Guide
1076 125
Formula
COCl₂
Conversion
1 ppm = 4.05 mg/m3
IDLH
2 ppm
See: 75445
Exposure Limits
NIOSH REL
TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) [15-minute]
OSHA PEL
TWA 0.1 ppm (0.4 mg/m3)
Measurement Methods
OSHA 61
See: NMAM or OSHA Methods
Physical Description
Colorless gas with a suffocating odor like musty hay. [Note: A fuming liquid below 47°F. Shipped as a liquefied compressed gas.]
Molecular Weight
98.9
Boiling Point
47°F
Freezing Point
-198°F
Solubility
Slight
Vapor Pressure
1.6 atm
Ionization Potential
11.55 eV
Specific Gravity
1.43 (Liquid at 32°F)
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Relative Gas Density
3.48
Nonflammable Gas
Incompatibilities & Reactivities
Moisture, alkalis, ammonia, alcohols, copper [Note: Reacts slowly in water to form hydrochloric acid & carbon dioxide.]
Exposure Routes
inhalation, skin and/or eye contact (liquid)
Symptoms
irritation eyes; dry burning throat; vomiting; cough, foamy sputum, dyspnea (breathing difficulty), chest pain, cyanosis; liquid: frostbite
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact (liquid)
Eyes:Prevent eye contact (liquid)
Wash skin:When contaminated (liquid)
Remove:When wet or contaminated (liquid)
Change:No recommendation
Provide:Quick drench (liquid)
First Aid
(See procedures)
Eye:Irrigate immediately (liquid)
Skin:Water flush immediately (liquid)
Breathing:Respiratory support
Respirator Recommendations

NIOSH/OSHA

Up to 1 ppm:
(APF = 10) Any supplied-air respirator*

Up to 2 ppm:
(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

See also
INTRODUCTION   ICSC CARD: 0007   MEDICAL TESTS: 0186
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health