CAS 8003-34-7 corresponds to Pyrethrins, which are natural mixed insecticidal active ingredients extracted from dried inflorescences of Asteraceae plants. They are composed of six structurally similar cyclopropanecarboxylic acid esters and have rapid contact killing, low mammalian toxicity, and easy photodegradation characteristics.

Core identification and source
-Chinese name: Pyrethroid (also known as pyrethroid or natural pyrethroid extract)
-English name: Pyrethrins/Pyrethrum Extract
-CAS number: 8003-34-7
-Source: Mainly extracted from dried flower heads of Pyrethrum cinerarifolium, non chemically synthesized monomers; Pyrethroid “is its artificially synthesized analog, and the two are different.
-Composition: A natural mixture containing six active ingredients: pyrethroids I/II, guaiacol esters I/II, and pyrethroids I/II.

Physical and chemical properties (typical technical level)
-Appearance: Yellow to brown viscous liquid (pure component can be solid), with a special odor
-Molecular formula: No single molecular formula (mixture); The main components, such as pyrethroids I, are C ₂₁ H ₂₈ O3, and technical products are often approximated by C ₄∝ H ₅₆ O ₈ to represent the total sum
-Molecular weight: The main components are approximately 328.4; Technical mixtures have no fixed values (literature even standard 700.9 is an estimated mixture average)
-Solubility: Insoluble in water, soluble in organic solvents such as ethanol, acetone, chloroform, etc
-Stability: prone to decomposition and failure when exposed to light, heat, or alkali, with a short residual period
-Density/refractive index: Density is approximately 0.84-1.04 g/cm ³; The refractive index n ₂₀/D is approximately 1.45-1.50.

Mechanism of action and safety characteristics
-Mode of action: Neurotoxin, which causes excitement, paralysis, and death by blocking insect sodium ion channels; Has strong impact and killing effect, without internal suction
-Toxicity classification: Low toxicity to mammals (oral LD ₅₀ in rats is about 200-1500 mg/kg), but high toxicity to fish and bees, with sensitization risk
-Environmental behavior: easily photodegradable, minimal soil residue, relatively environmentally friendly
-Main uses: Sanitary insecticides (mosquito coils, aerosols), agricultural biopesticides (for controlling aphids, Lepidoptera larvae, etc.), often compounded with synergists (such as piperonyl butoxide).

Precautions
-Distinguishing concepts: CAS 8003-34-7 specifically refers to natural extracts; Artificially synthesized ‘pyrethroids’ (such as chlorpyrifos and deltamethrin) have their own independent CAS numbers and cannot be confused.
-Storage requirements: Light shielded, sealed, low-temperature dry storage, avoid contact with alkaline substances.

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Pyrethrins 20% 50% CAS 8003-34-7
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