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Synonyms:A reaction mixture comprising the enantiomeric pair (R)-α-cyano-3-phenoxybenzyl (1S,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-3-phenoxybenzyl (1R,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate with the enantiomeric pair (R)-α-cyano-3-phenoxybenzyl (1S,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-3-phenoxybenzyl (1R,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate in ratio c. 2:3
CAS No.:mixture of 72204-43-4 and 65731-84-2 and 83860-31-5 and 65732-07-2
EC No.: mixture of 276-457-7 and 265-898-0 and 281-086-9 and 265-899-6
Molecular Weight: 416.3
Molecular Formula:C22H19Cl2NO3
Structural Formula:Beta-Cypermethrin
Form: Tech. forms colourless or pale yellow crystals.
M.p.: 63.1–69.2 °C (varies with even a small - 1% - change in isomer ratio)
B.p.: 286.1±0.06 °C/97.4 kPa
V.p.: 1.8 × 10-4 mPa (20 °C)
S.g.: 1.336±0.0050 (20 °C)
Solubility: In water 51.5 at 5 °C), 93.4 at 25 °C, 276.0 at 35 °C (all in μg/l, pH 7). Iso-propanol 11.5, xylene 349.8, dichloromethane 3878, acetone 2102, (all in mg/ml, 20 °C).
Stable at 150 °C; to air and sunlight; in neutral and slightly acidic media. Epimerised in presence of base, hydrolysed in strongly alkaline media.


Beta-cypermethrin is a non-systemic insecticide with contact and stomach action, disturbing function of neurons by interaction with the sodium channel. Used against a wide range of insect pests in public health (e.g. flies, cockroaches, mosquitoes, fleas, lice, bugs) and in veterinary applications (ectoparasitic ticks and mites). In plant protection, it is effective against Coleoptera and Lepidoptera, and gives good protection against Orthoptera, Diptera, Hemiptera, and Homoptera.



Standard Packaging

Drum, small bottle

Packaging photos coming soon

Risks and Safety Information

Class 6.1, Toxic
Oral Acute oral LD50 (female rats 166; male rats 178), Skin and eye Acute percutaneous LD50 ( rats) >5000 mg/kg. Mild skin and eye irritant (rabbits). Non-sensitising to skin (guinea pigs). Birds Acute oral LD50 (quail) 8030, Fish LC50 (96h) for carp 0.028, Algae LC50 for Selenastrum capricornutum 56.2 mg/l. Bees LD50 (48h, oral) 0.0018 mg a.i./bee (as 5% formulation)

Warning Toxic

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