Triphenyl phosphite (TPP)

Triphenyl phosphite (TPP) is a triple ester of phosphorous acid with alcoholic phenol. The molecules of the substance consist of a central phosphorus atom and three phenyl rings, which are each connected to it by an oxygen atom.

We supply triphenyl phosphite (TPP) in liquid form. However, depending on the ambient temperatures, the colorless to yellowish compound can also exist as a crystalline solid or viscous melt, as its melting point is 22 to 25 °C. Heating above 360 °C leads to thermal decomposition of the substance. Triphenyl phosphite has a pleasant, phenol-like odor. The compound is readily soluble in methanol, ethanol, benzene, acetone, diethyl ether and many other organic solvents. In water, on the other hand, the substance decomposes slowly. The aqueous solution reacts strongly acidic with a pH value of 1.

Triphenyl phosphite (TPP) is chemically stable when handled and stored as directed. However, the substance gradually undergoes transformation processes when it comes into contact with moisture or air. Violent reactions can occur with strong oxidizing agents and acids.

The compound is flammable, but is difficult to ignite. Thermal decomposition of triphenyl phosphite releases hazardous and noxious gases. Among other things, phosphine, phosphorus oxides, carbon dioxide and carbon monoxide are formed.

Triphenyl phosphite (TPP) poses acute and chronic health hazards. On the skin, the compound can cause redness, irritation and chemical burns. Wetted parts of the body should be thoroughly cleaned with water and polyethylene glycol 400. If symptoms persist, seek medical help. In addition to painful irritations, triphenyl phosphite can cause damage to the cornea that is difficult to heal. After rinsing under running water, the affected eye must be treated immediately by an ophthalmologist.

Inhalation of vapors of the substance is expected to cause at most minor irritation of the respiratory tract. If triphenyl phosphite is swallowed, it may irritate the mucous membranes and the compound may be absorbed into the metabolism. Ingestion of significant amounts can cause central nervous system disorders such as coordination problems, paralysis and convulsions. Impairment of the liver function by triphenyl phosphite is possible. If poisoning is suspected, it is necessary to urgently arrange a medical examination with subsequent observation of delayed symptoms.

Triphenyl phosphite is toxic to aquatic organisms and has been rated as severely hazardous to water. Entry of the compound into the ground, water bodies or the sewage system must be avoided. Any leakage of triphenyl phosphite into the environment must be reported immediately to the responsible authorities. Special regulations apply to the transport of the substance.