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Synonyms: 1,1′-dimethyl-4,4′-bipyridinediium dichloride; 1,1′-dimethyl-4,4′-bipyridinium dichloride; 1,1′-dimethyl-4,4′-bipyridylium dichloride (IUPAC); methyl viologen dichloride
CAS No.: 1910-42-5
EC No.: 217-615-7
Molecular Weight: 257.2
Structural Formula: Paraquat
Form: Colourless, hygroscopic crystals.
M.p.: Decomposes at c. 340 °C
V.p.: <1 × 10-2 mPa (25 °C)
S.g.: 1.5 (25 °C)
Solubility: In water c. 620 g/l (pH c. 5–9, 20 °C). In methanol 143 g/l (20 °C); practically insoluble in most other organic solvents.
Stability: Decomposes at c. 340 °C. Hydrolytically stable in alkaline, neutral and acidic media. Photolytically stable in aqueous solution at pH 7.


Used for broad-spectrum control of broad-leaved weeds and grasses in fruit orchards (including citrus), plantation crops, forestry, etc. Also used for general weed control on non-crop land; as a defoliant for cotton and hops; for destruction of potato haulms; as a desiccant for pineapples, sugar cane, soya beans and sunflowers; for strawberry runner control; and in pasture renovation.



Standard Packaging

Drum, Bottle

Packaging photos coming soon

Risks and Safety Information

Very Toxic pesticide. Class 6.1

Acute oral LD50(rats) 129 to 157, Skin and eye Acute percutaneous LD50(rats) >911mg/kg. Irritating to skin and eyes (rabbits). Absorption through intact human skin is minimal; exposures can cause irritation and a delay in the healing of cuts and wounds; can cause temporary damage to nails. Not a skin sensitiser (guinea pigs). Birds Acute oral LD50(bobwhite quail) 175,LC50 (5d) for bobwhite quail 981,Fish LC50 (96h) for rainbow trout 26, Algae EbC50 (96 h) for green algae 0.10mg/l. Bees LD50 (120h) (oral) 15μg/bee; (contact) 70μg/bee.

Warning, Toxic

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