2528-39-4

Basic information

• Product Name: TRIHEXYL PHOSPHATE
• Synonyms: TRIHEXYL PHOSPHATE;TRI-N-HEXYLPHOSPHONATE;phosphoric acid trihexyl ester;Tri-n-hexyl phosphate, 90% min;Trihexyl phosphate, 90% min;Tri-n-hexyl phosphate, 90+%;Tri-n-hexyl phosphate;Flame Retardant THP
• CAS NO: 2528-39-4
• Molecular Formula: C₁₈H₃₉O₄P
• Molecular Weight: 350.47
• EINECS: 219-774-8
• Mol File: 2528-39-4.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 354.1 °C at 760 mmHg
• Flash Point: 181.6 °C
• Appearance: Colorless/Liquid
• Density: 0.95 g/cm³
• Vapor Pressure: 6.99E-05mmHg at 25°C
• Refractive Index: 1.441
• Storage Temp.: Refrigerator, under inert atmosphere
• Solubility: Chloroform (Slightly), Methanol (Slightly)
• Water Solubility: 250μg/L at 20℃
• CAS DataBase Reference: TRIHEXYL PHOSPHATE(CAS DataBase Reference)
• NIST Chemistry Reference: TRIHEXYL PHOSPHATE(2528-39-4)
• EPA Substance Registry System: TRIHEXYL PHOSPHATE(2528-39-4)

Safety Data

• TSCA: Yes
• HazardClass: IRRITANT
• Hazardous Substances Data: 2528-39-4(Hazardous Substances Data)

Usage

Uses

Trihexyl Phosphate is used as a modifier in the flame-retardant, polyphenylene oxide.

Flammability and Explosibility

Notclassified

InChI:InChI=1/C18H39O4P/c1-4-7-10-13-16-20-23(19,21-17-14-11-8-5-2)22-18-15-12-9-6-3/h4-18H2,1-3H3

Upstream product

• 111-27-3 hexan-1-ol 
• 19779-06-7 sodium hexanolate 

Relevant articles and documents

ELECTROCHEMICALLY INDUCED PROCESSES IN THE FORMATION OF PHOSPHORUS ACID DERIVATIVES. 2. THE ROLE OF POLYMERIZATION PROCESSES IN THE ELECTROSYNTHESIS OF THE ESTERS OF PHOSPHORUS ACIDS FROM WHITE PHOSPHORUS

The mechanism of the electrosynthesis of phosphate esters from white phosphorus was investigated.It was shown that the reaction takes place by two paths, i.e., monomeric (with the participation of dissolved phosphorus) and polymeric (with the participation of phosphorus on the surface of an emulsion drop).It was established that in an alcohol solution of tetraethylammonium iodide the main part of the final product is formed through an intermediate polymeric compound.It was noticed that by studying the dynamics of the accumulation of the dissolved product during electrolysis it is possible to trace the mechanism of reaction of the phosphorus at the individual stages of the process.Key words: Phosphate esters, white phosphorus, electrosynthesis.

Absolute viscosity and density of trisubstituted phosphoric esters

This paper presents measurements on the absolute viscosity (η) and density (ρ) of trisubstituted phosphoric esters which are useful in understanding their flow mechanism necessary for accessing their role as plasticizers. The effect of chain length and branching has been examined on the η and ρ trends. From η data, by using the Vogel-Tammann-Fulchur (VTF) equation, the VTF temperature (To) has been obtained which also represents the ideal glass transition temperature. To is related to the flexibility of the molecules. It is observed that To initially decreases with molecular weight, reaches a minimum, and increases thereafter. The initial decrease in To has been attributed to the enhanced flexibility of the phosphate esters. Reversal of flexibility with relative molar mass beyond 400 is due to the gentle collision of the arms of the trisubstituted phosphoric esters. This has been further corroborated from the molar mass exponent as exhibited in the η-molar mass plot. The isomeric effect on η has also been investigated in tricresyl phosphates, hitherto for the first time. The ortho isomer has highest η among the isomers. The para isomer was found to have lowest To and hence highest flexibility compared to the ortho and meta isomers.