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Agrochemicals and fertilisers

Imidacloprid vs thiamethoxam

Imidacloprid (C9H10ClN5O2, CAS 138261-41-3) and thiamethoxam (C8H10ClN5O3S, CAS 153719-23-4) are both listed under insecticides and acaricides.

Imidacloprid has a molar mass of 255.67 g/mol, thiamethoxam 291.72 g/mol.

Measured melting points are 144 °C for imidacloprid and 139.1 °C for thiamethoxam.

Imidacloprid carries the GHS signal word Danger, thiamethoxam Warning.

On CompoundList, 288 suppliers list imidacloprid and 142 suppliers list thiamethoxam.

Data last updated 7 October 2026

Imidacloprid and thiamethoxam compared side by side
Imidacloprid chemical structure, C9H10ClN5O2, CAS 138261-41-3
Imidacloprid
Thiamethoxam chemical structure, C8H10ClN5O3S, CAS 153719-23-4
Thiamethoxam
Identity
Name in our databaseImidaclopridThiamethoxam
CAS number138261-41-3153719-23-4
Molecular formulaC9H10ClN5O2C8H10ClN5O3S
Molar mass255.67 g/mol291.72 g/mol
IUPAC name(NE)-N-[1-[(6-chloro-3-pyridinyl)methyl]imidazolidin-2-ylidene]nitramide(NE)-N-[3-[(2-chloro-1,3-thiazol-5-yl)methyl]-5-methyl-1,3,5-oxadiazinan-4-ylidene]nitramide
EC number428-040-8428-650-4
Physical properties
AppearanceColorless crystalsCrystalline powder
Melting point144 °C139.1 °C
Density1.54 g/cm³1.57 at 20 °C
SolubilityIn water, 6.1 × 10⁺² mg/L at 20 °CIn water, 4.1 × 10⁺³ mg/L at 25 °C
LogP (octanol/water)Computed from the structure0.691.02
Safety (GHS)
Signal wordDangerWarning
Pictograms
GHS06: Acute toxicity (severe)
GHS09: Hazardous to the environment
GHS07: Harmful or irritant
GHS08: Serious health hazard
GHS09: Hazardous to the environment
Hazard statements
  • H301 Toxic if swallowed.
  • H400 Very toxic to aquatic life.
  • H410 Very toxic to aquatic life with long lasting effects.
  • H302 Harmful if swallowed.
  • H361fd Suspected of damaging fertility. Suspected of damaging the unborn child.
  • H400 Very toxic to aquatic life.
  • H410 Very toxic to aquatic life with long lasting effects.
UN numberUN 2588Not recorded
Uses and classification
Uses and functions
  • Insecticides
  • Aetiopathogenetic role
  • Cholinergic agonist
  • Cholinergic drug
  • Environmental contaminant
  • Genotoxin
  • Insecticides
  • Aetiopathogenetic role
  • Antifeedant
  • Carcinogenic agent
  • Cholinergic agonist
  • Cholinergic drug
CategoryAgrochemicals › Insecticides and acaricidesAgrochemicals › Insecticides and acaricides
HS code293339Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the…293410Compounds containing an unfused thiazole ring (whether or not hydrogenated) in the…
Market on CompoundList
Suppliers288 suppliers142 suppliers
Supplier countries30 countries, most in China, Brazil, India19 countries, most in China, India, Brazil
Price rangeOnly prices set by suppliers who manage their own profilePrice on requestPrice on request

Measured and computed values as shown on each chemical page, plus live listings on CompoundList. Details may have changed, please confirm them with the supplier. Safety data is a summary, not an SDS.

Imidacloprid
Thiamethoxam

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