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Chemical Fact Sheet

Chemical Abstract Number (CAS #) 10453868
CASRN 10453-86-8
SynonymsResmethrin
Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, [5-(phenylmethyl)-3-furanyl]methyl ester
5-Benzylfurfuryl chrysanthemate
Analytical Method EPA Method 616
Molecular FormulaC22H26O3

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use POTENT CONTACT INSECTICIDE EFFECTIVE AGAINST A WIDE RANGE OF INSECTS. HIGHLY ACTIVE INSECTICIDE RECOMMENDED FOR USE AGAINST HOUSEFLIES, GERMAN COCKROACHES. APPLIED ON INSECTS FOUND IN HOUSEHOLD, GREENHOUSE, INDOOR LANDSCAPING, MUSHROOM HOUSES, INDUSTRIAL, STORED PRODUCT, MOSQUITO & INSECT CONTROL. PET SPRAYS, PET SHAMPOO, AND APPLICATION ON HORSES AND HORSE STABLES. CLEARED FOR USE IN AEROSOLS, AQUEOUS PRESSURIZED SPRAYS, EMULSIFIABLE CONCENTRATES, TRANSPARENT EMULSIONS, & OIL BASE LIQ, INCL ULV CLEARED FOR FABRIC PROTECTION. Resmethrin (2%) has replaced Pyrethrum-DDT formulation in aircraft disinfection. Control on wood lice Used as a household and garden insecticide (especially for control of glasshouse whiteflies and aphids), and in agricultural premises. Resmethrin is currently used for mosquito control (by aerial application) in the USA, and it can also be used for the control of white fly in greenhouses. Resmethrin is mainly used in aerosol formulations, but also in oil formulations and emulsifiable concentrates, for the control of household and public health insects. It is also used in combination with other insecticides (e.g., tetramethrin, malathion). Insecticide Pyrethrins
Apparent Color WAXY OFF-WHITE TO TAN SOLID; Colorless crystals
Odor CHRYSANTHEMATE ODOR
Boiling Point 180 deg C @ 0.01 mm Hg
Melting Point 43-48 deg C
Molecular Weight 338.48
Density 0.958-0.968 @ 20 deg C
Sensitivity Data Immediately irritating to the eye. Pyrethrins The chief effect from exposure is skin rash particularly on moist areas of the skin. May irritate the eyes.
Environmental Impact Resmethrin's use as a contact insecticide releases the compound directly to the environment through applications in sprays and other application routes. If released to the atmosphere, resmethrin will degrade rapidly in the vapor phase by reaction with ozone and photochemically produced hydroxyl radicals (estimated half-life of 25 min). Particulate phase resmethrin will be removed physically from air by wet and dry deposition. If released to soil or water, resmethrin can degrade readily through biodegradation, hydrolysis and photodegradation. The photodegradation half-life in sunlight (at the water's surface or as a thin-film on dry surfaces) can be as fast as several hrs or less. Aqueous hydrolysis is expected to become important only in alkaline media (pH > 8). Resmethrin's high log Koc value (estimated as log 4.7-5.6) suggests that it will not leach in soil and that it will partition to sediment from water in aquatic ecosystems. Occupational exposure to resmethrin occurs through dermal contact and inhalation of dust, especially to workers applying the compound as an insecticide. Household use of resmethrin-containing pesticides will expose the general population through inhalation and dermal contact
Environmental Fate TERRESTRIAL FATE: Resmethrin is expected to degrade in soil through aqueous hydrolysis and biodegradation. Rapid photodegradation will occur on surfaces exposed to sunlight. The second-order aqueous hydrolysis half-lives of resmethrin have been estimated to be 1.3 yrs, 47 days and 4.7 days at pH 7, 8 and 9, respectively, at 25 deg C(1,SRC) which indicate that hydrolysis will be important in moist alkaline soils (pH > 8). Although environmental biodegradation data specific to resmethrin is not available, the pyrethroid class of insecticides ise readily degraded by environmental microorganisms ; based upon its structure, resmethrin are also expected to readily biodegrade. Photodegradation studies have shown that surface applications of resmethrin degrade readily (half-life of several hours or less) with exposure to sunlight or sunlamps(3-4). Resmethrin's estimated log Koc value of 4.7-5.6(5-6,SRC) suggests that resmethrin will not leach in soil. AQUATIC FATE: Resmethrin can degrade in natural water through photodegradation, hydrolysis and biodegradation. The predicted near-surface half-life for the photo-oxidation of resmethrin exposed to sunlight in natural water has been reported as 0.2 hr . The second-order aqueous hydrolysis half-lives of resmethrin have been estimated to be 1.3 yrs, 47 days and 4.7 days at pH 7, 8 and 9, respectively, at 25 deg C(2,SRC) which indicate that hydrolysis will be important only in alkaline waters (pH > 8). Although environmental biodegradation data specific to resmethrin is not available, the pyrethroid class of insecticides is readily degraded by environmental microorganisms ; based upon its structure, resmethrin is also expected to readily biodegrade. Resmethrin's estimated log Koc value of 4.7-5.6(4-5,SRC) suggests that resmethrin will partition from the water column to sediment and suspended matter. ATMOSPHERIC FATE: Based upon a reported vapor pressure of 1.13X10-8 mm Hg at 30 deg C , resmethrin can exist in both the vapor and particulate phases in the ambient atmosphere(2,SRC). It will degrade rapidly in the vapor phase by reaction with ozone and photochemically produced hydroxyl radicals with a combined estimated half-life of about 25 min(3-4,SRC). Particulate phase resmethrin and aerosols released to air during spray applications of resmethrin insecticide will be removed from air physically by dry and wet deposition.

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