# NIOSH Pocket Guide to Chemical Hazards
Phosgene | CAS 75-44-5
COCl2 | RTECS SY5600000
Synonyms & Trade Names Carbon oxychloride, Carbonyl chloride, Carbonyl dichloride, Chloroformyl chloride | DOT ID & Guide 1076 125
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)
IDLH 2 ppm | Conversion 1 ppm = 4.05 mg/m3
Physical Description Colorless gas with a suffocating odor like musty hay. [Note: A fuming liquid below 47°F. Shipped as a liquefied compressed gas.]
MW: 98.9 | BP: 47°F | FRZ: -198°F | Sol: Slight
VP: 1.6 atm | IP: 11.55 eV | RGasD: 3.48 | Sp.Gr: 1.43 (Liquid at 32°F)
Fl.P: NA | UEL: NA | LEL: NA |
Nonflammable Gas
Incompatibilities & Reactivities Moisture, alkalis, ammonia, alcohols, copper [Note: Reacts slowly in water to form hydrochloric acid & carbon dioxide.]
Measurement Methods OSHA 61
Personal Protection & Sanitation 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
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
See also: INTRODUCTION