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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
Measurement Methods

NIOSH 5034
See: NMAM or OSHA Methods
Physical Description
Colorless to pale-yellow, odorless liquid.
MW:
266.3
BP:
552°F (Decomposes)
FRZ:
-112°F
Sol:
0.6%		 VP(77°F): 0.004 mmHg
IP:
?
Sp.Gr:
0.98		 Fl.P(oc): 295°F
UEL:
?
LEL:
?
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   See ICSC CARD: 0584
 

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