# NIOSH Pocket Guide to Chemical Hazards
Phosphorus trichloride | CAS 7719-12-2
PCl3 | RTECS TH3675000
Synonyms & Trade Names Phosphorus chloride | DOT ID & Guide 1809 137
Exposure Limits | NIOSH REL: TWA 0.2 ppm (1.5 mg/m3) ST 0.5 ppm (3 mg/m3)
OSHA PEL†: TWA 0.5 ppm (3 mg/m3)
IDLH 25 ppm | Conversion 1 ppm = 5.62 mg/m3
Physical Description Colorless to yellow, fuming liquid with an odor like hydrochloric acid.
MW: 137.4 | BP: 169°F | FRZ: -170°F | Sol: Reacts
VP: 100 mmHg | IP: 9.91 eV |  | Sp.Gr: 1.58
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid; however, a strong oxidizer that may ignite combustibles upon contact.
Incompatibilities & Reactivities Water, chemically-active metals such as sodium & potassium, aluminum, strong nitric acid, acetic acid, organic matter [Note: Hydrolyzes in water to form hydrochloric acid and phosphoric acid.]
Measurement Methods NIOSH 6402
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 10 ppm: (APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 25 ppm: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode 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, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; pulmonary edema; eye, skin burns
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION