NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Tributyl phosphate

CAS
126-73-8

(CH3[CH2]3O)3PO

RTECS
TC7700000
Synonyms & Trade Names

Butyl phosphate, TBP, Tributyl ester of phosphoric acid, Tri-n-butyl phosphate
DOT ID & Guide

Exposure
Limits

NIOSH REL: TWA 0.2 ppm (2.5 mg/m3)
OSHA PEL: TWA 5 mg/m3
IDLH
30 ppm See: 126738
Conversion
1 ppm = 10.89 mg/m3
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 200F.
Incompatibilities & Reactivities

Alkalis, oxidizers, water, moist air
Measurement Methods
NIOSH 5034
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

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
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, respiratory system, headache; nausea
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0584