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Tributyl phosphate

Tributyl phosphate, known commonly as TBP, is an organophosphorus compound with the chemical formula (CH3CH2CH2CH2O)3PO. This colourless, odorless liquid finds some applications as an extractant and a plasticizer. It is an ester of phosphoric acid with n-butanol.

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Further Information

Identifiers

CAS Number: 126-73-8

JSmol: Interactive image

ChEBI: CHEBI:35019

ChemSpider: 29090

ECHA InfoCard: 100.004.365

KEGG: C14439

PubChem: 31357

Properties

Chemical formula: C12H27O4P

Molar mass: 266.32 g·mol

Appearance: Colorless to pale-yellow liquid

Density: 0.9727 g/mL

Melting point: −80 °C (−112 °F; 193 K)

Boiling point: 289 °C (552 °F; 562 K)

Solubility in water: 1 mL/165 mL water

Vapor pressure: 0.004 mmHg (25°C)

Hazards

Safety data sheet: External MSDS

NFPA 704:

Flash point: 146.1 °C (295.0 °F; 419.2 K)

median dose: 1189 mg/kg (mouse, oral)
3000 mg/kg (rat, oral)

median concentration: 227 ppm (cat, 4–5 h)
123 ppm (rat, 6 h)
117 ppm (rat)
2529 ppm (rat, 1 h)

lowest published: 2214 ppm (cat, 5 h)

NIOSH

PEL: TWA 5 mg/m3

REL: TWA 0.2 ppm (2.5 mg/m)3

IDLH: 30 ppm

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references