Trimethyl phosphate[2]

Updated: 2026-09-17

Overview

Trimethyl phosphate (TMP) is an organophosphorus compound that serves as an important industrial chemical. With its versatile properties as both a flame retardant and polar aprotic solvent, TMP finds applications across multiple sectors including electronics manufacturing, textile treatment, and specialty chemical production. The compound was first synthesized in the early 20th century and has since become a valuable intermediate in organic synthesis. Its commercial availability and relatively low toxicity compared to other phosphorus compounds make it a preferred choice for many industrial applications.

Physical and Chemical Properties

Trimethyl phosphate is a colorless to slightly yellow liquid at room temperature with a mild, characteristic odor. It has a density of 1.21 g/cm³ and demonstrates good thermal stability, with a boiling point around 197-198°C. Chemically, TMP is a triester of phosphoric acid and methanol. It exhibits excellent solubility in both water and organic solvents, making it valuable as a reaction medium. The compound is hydrolytically stable under neutral conditions but may decompose under strongly acidic or basic environments.

Main Applications

The primary application of trimethyl phosphate is as a flame retardant in textiles and electronics. Its phosphorus content helps interrupt the combustion cycle, making materials more resistant to ignition. In the electronics industry, TMP is used as a flame retardant additive for circuit boards and other components. Additionally, TMP serves as a solvent in various chemical reactions, particularly those requiring a polar aprotic medium. It finds use in pharmaceutical synthesis, polymer production, and as a plasticizer in certain applications. The compound's ability to dissolve both organic and inorganic substances makes it versatile for specialized formulations.

Safety and Storage

While trimethyl phosphate is considered relatively low in toxicity compared to other organophosphorus compounds, proper safety precautions are essential. The material may cause irritation to skin, eyes, and respiratory tract upon exposure. Appropriate personal protective equipment including gloves and goggles should be used when handling. Storage requirements include keeping containers tightly closed in a cool, well-ventilated area away from heat sources and oxidizing materials. Secondary containment is recommended to prevent environmental contamination in case of leaks. Shelf life is typically 2-3 years when stored under proper conditions.

B2B Procurement Guide

When procuring trimethyl phosphate for industrial use, several factors should be considered. Purity specifications typically range from 98% to 99.9%, with higher purity grades commanding premium prices. Bulk purchases (drum or tanker quantities) generally offer significant cost savings compared to small packaging. Reliable suppliers should provide comprehensive product documentation including certificates of analysis, safety data sheets, and regulatory compliance statements. For international shipments, verify that the product meets all relevant regional regulations such as REACH in Europe or TSCA in the United States. Lead times may vary from 2-6 weeks depending on supplier inventory and logistics requirements.