# NIOSH Pocket Guide to Chemical Hazards
Phosphine | CAS 7803-51-2
PH3 | RTECS SY7525000
Synonyms & Trade Names Hydrogen phosphide, Phosphorated hydrogen, Phosphorus hydride, Phosphorus trihydride | DOT ID & Guide 2199 119
Exposure Limits | NIOSH REL: TWA 0.3 ppm (0.4 mg/m3) ST 1 ppm (1 mg/m3)
OSHA PEL†: TWA 0.3 ppm (0.4 mg/m3)
IDLH 50 ppm | Conversion 1 ppm = 1.39 mg/m3
Physical Description Colorless gas with a fish- or garlic-like odor. [pesticide] [Note: Shipped as a liquefied compressed gas. Pure compound is odorless.]
MW: 34.0 | BP: -126°F | FRZ: -209°F | Sol: Slight
VP: 41.3 atm | IP: 9.96 eV | RGasD: 1.18 |
Fl.P: NA (Gas) | UEL: ? | LEL: 1.79% |
Flammable Gas
Incompatibilities & Reactivities Air, oxidizers, chlorine, acids, moisture, halogenated hydrocarbons, copper [Note: May ignite SPONTANEOUSLY on contact with air.]
Measurement Methods OSHA 1003, ID180
Personal Protection & Sanitation Skin: Frostbite Eyes: Frostbite Wash skin: No recommendation Remove: When wet (flammable) Change: No recommendation Provide: Frostbite | First Aid (See procedures) Eye: Frostbite Skin: Frostbite Breathing: Respiratory support
Respirator Recommendations NIOSH/OSHA Up to 3 ppm: (APF = 10) Any supplied-air respirator Up to 7.5 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Up to 15 ppm: (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 Up to 50 ppm: (APF = 1000) Any supplied-air respirator 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, skin and/or eye contact (liquid)
Symptoms Nausea, vomiting, abdominal pain, diarrhea; thirst; chest tightness, dyspnea (breathing difficulty); muscle pain, chills; stupor or syncope; pulmonary edema; liquid: frostbite
Target Organs respiratory system
See also: INTRODUCTION