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Tributyl phosphate

Synonyms & Trade Names
Butyl phosphate, TBP, Tributyl ester of phosphoric acid, Tri-n-butyl phosphate
CAS No.
126-73-8
RTECS No.
TC7700000
DOT ID & Guide
Formula
(CH₃[CH₂]₃O)₃PO
Conversion
1 ppm = 10.89 mg/m3
IDLH
30 ppm
See: 126738
Exposure Limits
NIOSH REL
TWA 0.2 ppm (2.5 mg/m3)
OSHA PEL
TWA 5 mg/m3 See Appendix G
Measurement Methods
NIOSH 5034
See: NMAM or OSHA Methods
Physical Description
Colorless to pale-yellow, odorless liquid.
Molecular Weight
266.3
Boiling Point
552°F (Decomposes)
Freezing Point
-112°F
Solubility
0.6%
Vapor Pressure
(77°F): 0.004 mmHg
Ionization Potential
?
Specific Gravity
0.98
Flash Point
(oc) 295°F
Upper Exposive Limit
?
Lower Explosive Limit
?
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities
Alkalis, oxidizers, water, moist air
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, respiratory system, headache; nausea
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet or contaminated
Change:No recommendation
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

Up to 2 ppm:
(APF = 10) Any supplied-air respirator

Up to 5 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode

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 30 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 organic vapor canister having an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0584

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