Triethyl phosphite

Triethyl phosphite (CAS 122-52-1 ), commonly abbreviated as TEP, is a trialkyl phosphite ester used as a reactive intermediate and stabilizer across polymer, lubricant, and agrochemical manufacturing. Ethyl phosphite is a recognized alternative name in trade and procurement contexts. Its value lies in its ability to act as a ligand, antioxidant precursor, or catalyst component depending on the application. In polymer production, TEP functions as a stabilizer and processing aid, protecting polyolefins and engineering resins from oxidative degradation during high-temperature compounding processes. Lubricant and metalworking fluid formulators incorporate it as an antiwear additive precursor, where it reacts in situ to form protective phosphorus-containing films on metal surfaces. In agrochemical synthesis, TEP serves as a key building block for organophosphate active ingredients, including pesticides and herbicides produced via Michaelis–Arbuzov reactions. It also acts as a ligand precursor in transition metal catalyst systems used in polymerization and fine chemical processes. This versatility makes it essential for modern chemical synthesis. Triethyl phosphite is supplied as a clear, colorless liquid in standard drum and IBC packaging. Technical grade is the primary commercial specification, with purity levels typically ranging from 97% to 99%+. High-purity grades are available for catalyst and synthesis applications where trace impurities affect reaction selectivity. Proper handling is required to maintain the integrity of the chemical during storage. Contact us for supply of Triethyl phosphite Request Quote

Key Technical Features

• High Purity Grade standard
• Consistent Batch Quality
• Full Regulatory & REACH Support
• Global Logistics Network enabled