Is Trioctyl Phosphate a Hazardous Chemical Substance?

What Is Trioctyl Phosphate?

Trioctyl phosphate, also known as tri(2-ethylhexyl) phosphate, abbreviated as TOP, with a molecular formula of C₂₄H₅₁O₄P, CAS No. 78-42-2, EINECS No. 201-116-6, and a molecular weight of 434.63, is an organophosphate compound.

Toxicity Of Trioctyl Phosphate

The 2828 hazardous substances listed in the "Catalogue of Hazardous Chemicals (2015 Edition)" do not include trioctyl phosphate. According to existing experimental data, trioctyl phosphate has no strong irritation to the human body and has low toxicity.

On September 2, 2015, the General Office of China’s State Administration of Work Safety issued a notice on implementing the "Catalogue of Hazardous Chemicals (2015 Edition)". Trioctyl phosphate, alias tri(2-ethylhexyl) phosphate, is not included in the Classification Information Sheet for Hazardous Chemicals, an annex to the Guidelines.

What Precautions Should Be Taken When Contacting Trioctyl Phosphate?

Although trioctyl phosphate is less toxic, it is still slightly poisonous and may cause skin irritation when having direct contact with the skin. The following are precautions for using trioctyl phosphate.

When contacting tri(2-ethylhexyl) phosphate in high doses, it is necessary to handle it with caution. Work clothes, protective gloves and safety glasses must be worn in the workshop, and the skin must be thoroughly washed after the operation. After the skin comes into contact with trioctyl phosphate, please take off the contaminated clothing immediately, wash the skin with water, and reuse the clothing after washing. If skin irritation occurs, please seek medical attention as soon as possible.

Trioctyl phosphate has a high boiling point and flash point, and is flammable above 370 degrees. Therefore, trioctyl phosphate is chemically stable and non-flammable under standard environmental conditions (normal temperature).

And trioctyl phosphate has excellent flame retardancy. In addition to being used as a plasticizer, extractant, and working solvent for the production of hydrogen peroxide by the anthraquinone method, it is also often used as a flame retardant in industry and is used to produce self-extinguishing products. It is worth noting that trioctyl phosphate is flame retardant, but heating or strong heating of trioctyl phosphate should still be avoided. If a fire occurs, a carbon dioxide foam fire extinguisher or a dry powder fire extinguisher should be used to extinguish the fire.

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