IUPAC Name: (3-phenoxyphenyl)methyl(1R,3R)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate
Molecular Formula: C₂₁H₂₀Cl₂O₃
Molecular Weight: 391.29 g/mol
EINECS: 258-067-9
Classification Code: Agricultural Chemical; Ectoparasiticide; Enzyme Inhibitors; Human Data; Insecticide; Insecticides; Mutation data; Pesticides; Reproductive Effect; Skin / Eye Irritant; Tumor data
Index of Refraction: 1.615
Molar Refractivity: 105.69 cm³
Molar Volume: 302.5 cm³
Surface Tension: 50.5 dyne/cm
Density: 1.293 g/cm³
Flash Point: 159.4 °C
Enthalpy of Vaporization: 72.76 kJ/mol
Boiling Point: 465.9 °C at 760 mmHg
Melting Point: 34-35 °C
storage temperature: 0-6 °C
Water Solubility: insoluble
Stability: Stable. Incompatible with strong oxidising agents.
Vapour Pressure of Permethrin (CAS NO.52645-53-1): 7.41E-09 mmHg at 25 °C

  Permethrin (CAS NO.52645-53-1) is used as synthetic pyrethroid insectide, more stable to light and at least as active as the natural pyrethrins and with low mammalian toxicity.

Poison by inhalation, intravenous, and intracerebral routes. Moderately toxic by ingestion. Experimental reproductive effects. Mutation data reported. A skin irritant. When heated to decomposition it emits toxic fumes of Cl⁻. See also ESTERS.
Hazard Codes: Xn,N,T,F
Risk Statements: 20/22-43-50/53-39/23/24/25-23/24/25-11-51/53-36-20/21/22 
R20/22:Harmful by inhalation and if swallowed. 
R43:May cause sensitization by skin contact. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R39:Danger of very serious irreversible effects. 
R11:Highly flammable. 
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R36:Irritating to eyes. 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed.
Safety Statements: 13-24-36/37/39-60-61-45-36/37-16-7-26 
S13:Keep away from food, drink and animal foodstuffs. 
S24:Avoid contact with skin. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37:Wear suitable protective clothing and gloves. 
S16:Keep away from sources of ignition. 
S7:Keep container tightly closed. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
RIDADR: UN1230 3/PG 2
RTECS: GZ1255000

  Permethrin (CAS NO.52645-53-1), its Synonyms are Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, (3-phenoxyphenyl)methyl ester ; Cyclopropanecarboxylic acid, 3-(2,2-dichlorovinyl)-2,2-dimethyl-, 3-phenoxybenzyl ester, (+-)-, (cis,trans)- ; Permethrin ; m-Phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate ; Permethrinfog ; Anomethrin N . It is crystalline solid.