Basic Info:

  • Chemical Synonym(s): Chlorpyrifos; 0,0-Diethyl-O-[3,5,6-trichloro-2-pyridyl]phosphorothioate; O,O-Diethyl O-3,5,6-Trichloro-2-Pyridyl Phosphorothioate; DOWCO; Chlorpyrifos,Chlorpyriphos
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  • CAS Number: 2921-88-2
  • Chemical Formula:


  • MSDS: Download


Boiling Point
Melting Point
Flash Point
Water Solubility
Insoluble. 0.00013 g/100 mL
Storage temp
Stable. Incompatible with strong oxidizing agents
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Chlorpyrifos is a white crystalline solid with a slight garlic odor. Its solubility in water is negligible, but it is soluble in most organic solvents.

It has high volatility inland. It can be produced by reacting diethyl phosphorothioate chloride with 3,5,6-trichloro-2-pyridinyl as raw material.

It is easy to combine with organic matter in the soil and has a unique effect on underground pests. In addition, it has an adequate period of more than 30 days on the earth.

It has lower toxicity than other pesticides, is harmless to natural enemies of insects, and is effective when mixed with other pesticides.


Chlorpyrifos is a broad-spectrum organophosphate insecticide, acaricide, and miticide used on a variety of crops. It is available as dust and liquid.  Its uses have been expanded to include some home uses.

In addition to being an active ingredient in many consumer pesticide products, it is also sold retail for termite control and ant and roach bait stations. It is toxic to both insects and vertebrates, including humans.

It is used to control insects in residential lawns, commercial turf, crops, and ornamental plants in urban and residential settings, in greenhouses, in forestry, and right-of-way to prevent wildfires.

Some products in the form of dust are used to control insects in non-food areas in food-handling establishments, warehouses, and another commercial, institutional, and industrial establishments, including the theatres.

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