Phosphine

Synonyms & Trade Names

Hydrogen phosphide, Phosphorated hydrogen, Phosphorus hydride, Phosphorus trihydride

CAS No.

7803-51-2

RTECS No.

SY7525000

DOT ID & Guide

2199 119

Formula

PH₃

Conversion

1 ppm = 1.39 mg/m³

IDLH

50 ppm
See: 7803512

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) See Appendix G

Measurement Methods

NIOSH 6002;
OSHA 1003 , ID180
See: NMAM or OSHA Methods

Physical Description

Colorless gas with a fish- or garlic-like odor. [pesticide] [Note: Shipped as a liquefied compressed gas. Pure compound is odorless.]

Molecular Weight

34.0

Boiling Point

-126°F

Freezing Point

-209°F

Solubility

Slight

Vapor Pressure

41.3 atm

Ionization Potential

9.96 eV

Flash Point

NA (Gas)

Upper Explosive Limit

Lower Explosive Limit

1.79%

Relative Gas Density

1.18

Flammable Gas

Incompatibilities & Reactivities

Air, oxidizers, chlorine, acids, moisture, halogenated hydrocarbons, copper [Note: May ignite SPONTANEOUSLY on contact with air.]

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

Personal Protection/Sanitation

(See protection codes)
Skin:Frostbite
Eyes:Frostbite
Wash skin:No recommendation
Remove:When wet (flammable)
Change:No recommendation
Provide:Frostbite wash

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

Important additional information about respirator selection

Phosphine

NIOSH REL

OSHA PEL

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