Chlorpyrifos

CAS No.: 2921-88-2

Molecular Formula: C9H11Cl3NO3PS

Molecular Weight: 350.59

Melting point	42–44°C
Boiling point	200°C
Density	1.398
Vapor pressure	5.03 × 10-5 mmHg at 25°C (subcooled liquid vapor pressure calculated from GC retention time data, Hinckley et al., 1990)
Flash point	2°C
Storage temperature	APPROX. 4°C
Solubility	At 25°C: 6.5, 7.9, 6.3, and 0.45 kg/kg in acetone, benzene, chloroform, and methanol, respectively (Worthing and Hance, 1991)
pKa	-5.28 ± 0.10 (Predicted)
Form	Solid
Color	White to off-white
Water solubility	Insoluble. 0.00013 g/100 mL
Stability	Stable. Incompatible with strong oxidizing agents.

Symbol (GHS)	GHS06, GHS09
Signal word	Danger
Hazard codes	T; N, N, T, Xn, F, Xi
RIDADR	UN 2783
Hazard class	6.1(b)
Packing group	III
HS code	29333990

Chlorpyrifos is a crystalline organophosphate insecticide, acaricide, and miticide used primarily to control foliage and soil-borne insect pests across a wide range of food and feed crops. It is widely used worldwide for controlling pest insects in agricultural, residential, and commercial settings. Its largest usage is in corn. It can also be used on other crops and vegetables, including soybeans, fruit and nut trees, cranberries, broccoli, and cauliflower. Non-agricultural applications include golf courses, turf, greenhouses, and non-structural wood treatment. It can also be used as a mosquito adulticide and in cockroach bait and anti-bait stations in child-resistant packaging. Its mode of action is to suppress the insect nervous system by inhibiting acetylcholinesterase.

Chlorpyrifos belongs to the organophosphate class of insecticides. Technical chlorpyrifos is an amber to white crystalline solid with a mild sulfur odor. It is insoluble in water but soluble in benzene, acetone, chloroform, carbon disulfide, diethyl ether, xylene, methylene chloride, and methanol. Chlorpyrifos formulations include emulsifiable concentrate (EC), dust, granular wettable powder (GWP), microcapsule, pellet, and sprays. Chlorpyrifos is widely used as an active ingredient in many commercial insecticides, such as Dursban and Lorsban, to control household pests, mosquitoes, and other pests. Formulations of chlorpyrifos include emulsifiable concentrates, granules, wettable powders, dust, microcapsules, pellets, and sprays.