Pyrethrin 50% (CAS: 8003-34-7) is a high-purity natural botanical insecticide, primarily extracted from the dried flowers of Pyrethrum cinerariifolium Trev. It is a complex mixture mainly composed of pyrethrin I, pyrethrin II, and small amounts of structurally similar cinerin I, cinerin II, jasmolin I, and jasmolin II, with the total content of pyrethrins not less than 50% (w/w) as the core specification.
Physically, Pyrethrin 50% appears as a buff to brown viscous liquid with a slight chrysanthemum-like aroma. It has a density of 0.84-0.86 g/cm³, a refractive index of n 20/D 1.45 (or 1.48-1.50 for some specifications), and a flash point of 75 °C. It is slightly soluble in chloroform and methanol, insoluble in water (with water solubility of 0.2 mg/L for pyrethrin I and 9 mg/L for pyrethrin II at ambient temperature), but soluble in most organic solvents such as ethanol. This product is photosensitive and unstable, decomposing easily under strong light, high temperature, or alkaline conditions, so it requires strict storage conditions.
As a natural insecticide, Pyrethrin 50% features rapid knockdown effect, broad insecticidal spectrum, and strong contact toxicity. Its mechanism of action is to act on the voltage-gated sodium channels of insect nerve cells, causing repeated and prolonged nerve firing, which leads to loss of motor coordination, paralysis, and eventual death of pests. It is widely used in household pest control, public hygiene (surface or space treatments), animal health, and green agriculture, effectively controlling mosquitoes, flies, bed bugs, aphids, thrips, fleas, and other pests. Notably, it is low-toxic to humans and warm-blooded animals, non-toxic to plants, and free of residual pollution, making it a globally recognized safe and environmentally friendly botanical pesticide. It is also applied in cannabis testing and pediculicide products such as anti-lice shampoos.
In terms of safety and storage, Pyrethrin 50% is classified as a hazardous substance with危险品标志 Xn (Harmful) and N (Dangerous for the environment), and its UN transport number is UN 2810 6.1/PG 3. It is combustible and releases pungent smoke when on fire, so it should be stored in a well-ventilated, low-temperature (2-8 °C) and dry warehouse, separated from food raw materials. Avoid contact with strong oxidants. The occupational exposure limit is TWA 5 mg/m³ and STEL 10 mg/m³. In case of exposure, immediate first aid is required: rinse eyes with water immediately, wash skin with soap, provide respiratory support if breathing is affected, and seek medical attention promptly if swallowed. Properly stored, its shelf life can reach two years.
Commercially, Pyrethrin 50% is one of the dominant high-purity specifications in the market, accounting for a large proportion of space treatment sprays due to its high activity. It is usually packaged in plastic drums or fiber drums (25 kg/drum, inner double plastic bags) and has passed certifications such as ISO, HACCP, Kosher, and NOP & CERES Organic. It is widely exported to regions such as the Americas, Europe, and Southeast Asia, supporting the production of over 3,200 registered products worldwide.
Post time:2026-03-31
