NIOSH Pocket Guide to Chemical Hazards

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 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 200�F.
Incompatibilities & Reactivities
Alkalis, oxidizers, water, moist air
Measurement Methods
NIOSH 5034
Personal Protection & Sanitation
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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
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