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Tributyl Phosphate (TBP)

CAS 126-73-8 · Formula C12H27O4P · MW 266.31 g/mol

A versatile phosphate ester for metal solvent-extraction, defoaming, and plasticizing duty. It is used as a solvent and extractant for metal-ion separation (including rare-earth and nuclear fuel-cycle processing), as a plasticizer, an antifoam agent, and a component of fire-resistant aircraft hydraulic fluids.

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HS Code
2919.90
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
pH Adjustment · Defoaming / Foam Control
Functional Roles
pH Adjustment Defoaming / Foam Control Plasticizing Solvency
Industries Served
HI&I Cleaning Industrial Manufacturing Oil & Gas
Applications & Use Cases
  • ▸ Solvent extraction: Extractant for rare-earth and actinide/nuclear fuel-cycle separations
  • ▸ Antifoam: Defoaming agent, including cement slurries for oil-well casings
  • ▸ Plasticizer: Plasticizer for cellulose esters, lacquers, and vinyl resins
  • ▸ Hydraulic fluids: Component of fire-resistant aircraft hydraulic fluids
Physical Properties
Melting Point
< -80 °C
Boiling Point
289 °C at 760 mmHg
Density
0.982 at 20 °C
Solubility
< 1 mg/mL at 21 °C
Vapor Pressure
13.7 mmHg at 20 °C
Flash Point
146 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2919 . 90
Chapter 29
Organic chemicals
Heading 29.19
Internationally harmonized (WCO HS)
Subheading 2919.90
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
126-73-8
Molecular Formula
C12H27O4P
Molecular Weight
266.31 g/mol
IUPAC Name
tributyl phosphate
PubChem CID
31357
InChI Key
STCOOQWBFONSKY-UHFFFAOYSA-N
Synonyms & Trade Names
TRIBUTYL PHOSPHATE Tri-n-butyl phosphate Tributylphosphate Phosphoric acid tributyl ester Tributylphosphat Celluphos 4 tbpa Disflamoll TB Tributilfosfato Tributylfosfaat Tributoxyphosphine oxide Phosphoric acid, tributyl ester Tributyle (phosphate de) Butyl phosphate, tri- Tributylfosfat Tri-N-butylphosphate Butyl phosphate, ((BuO)3PO) MCS 2495
Full Description

Tributyl phosphate (CAS 126-73-8, C12H27O4P) is a trialkyl phosphate ester. It is used as a solvent and extractant for metal-ion separation (including rare-earth and nuclear fuel-cycle processing), as a plasticizer, an antifoam agent, and a component of fire-resistant aircraft hydraulic fluids.

Frequently Asked Questions

What is tributyl phosphate used for?

Tributyl phosphate (TBP, CAS 126-73-8, C12H27O4P) is a trialkyl phosphate ester used as a solvent and extractant for metal-ion separation, including rare-earth and nuclear fuel-cycle processing. It also serves as an antifoam agent (including in oil-well cement slurries), a plasticizer for cellulose esters and vinyl resins, and a component of fire-resistant aircraft hydraulic fluids. We supply it in bulk.

Is tributyl phosphate the same as trisodium phosphate?

No. Tributyl phosphate is an organic trialkyl phosphate ester (C12H27O4P, CAS 126-73-8) used as a solvent and extractant, while trisodium phosphate is an inorganic sodium salt (Na3PO4) used as a cleaner and builder. They are unrelated in chemistry and application.

Is tributyl phosphate soluble in water?

TBP has limited solubility in water but is miscible with common organic solvents, which is what makes it effective as an extractant in liquid-liquid (solvent) extraction. Detailed physical properties are on the SDS and technical data sheet.

What is the HS code and formula for tributyl phosphate?

Tributyl phosphate has molecular formula C12H27O4P and classifies under HS 2919.90 (phosphoric esters and their salts, derivatives; other). Confirm the destination-country tariff line with your broker. We provide commercial documentation to support clearance.

What is the price of bulk tributyl phosphate and how is it packaged?

TBP pricing is quote-based and depends on grade, volume, and packaging (drums, IBC totes, bulk). Request a bulk quote with your target volume and delivery location for current pricing, CoA, and SDS.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.

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