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  • Dioctyl phthalate is a thick oil with a high molecular weight, a low vapor pressure, a high boiling point, and little or no odor.
  • Bis(2-ethylhexyl)phthalate, commonly abbreviated DEHP, is an organic compound with the formula C6H4(CO2C8H17)2. This colourless viscous liquid is soluble in oil, but not in water and it possesses good plasticizing properties.


  • Dioctyl phthalate increases the percentage of unsaturated fatty acids and decreases the cellular HSR sensitivity in yeast cells grown at 25 SC.
  • Synergist evaluations were done by preparing stock solutions of permethrin synergist (1:5) in dioctyl phthalate, and the final dilution with chloroform. Control papers were prepared with the different concentrations of each synergist in dioctyl phthalate.


  • Dioctyl phthalate is used as a vacuum pump oil.
  • Dioctyl phthalate is also used as a substance in chemical reactions in certain plastic manufacturing operations, and as a material from which aerosols of standard-sized particles can be produced.
  • Dioctyl phthalate is widely used to evaluate high-efficiency particulate aerosol (HEPA) filters.


  • Dioctyl phthalate(DOP) is also used to test in-place  high-efficiency particulate aerosol filters on exhaust ventilation and air pollution control systems. In the past, DOP was used to fit test respirators on individual workers.
  • The demand for 830 million pounds of 2-ethylhexanol, and its use in the manufacture of plasticizers, 48% of 2-ethylhexanol is used in the manufacture of plasticizers, of which 60% are dioctyl phthalates, it is projected that 241 million pounds of dioctyl phthalates were produced in the United States in later period.
  • Import quantities of dioctyl phthalates were about 4 million pounds in past years.

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