NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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 See: 7719122
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Important additional information about respirator selection
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   See ICSC CARD: 0696   See MEDICAL TESTS: 0191