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Rodenticides, nematicides and other pesticides

Methyl iodide

Also known as Iodomethane, Monoiodomethane, Methane, iodo-

CAS 74-88-4Formula CH3IMolar mass 141.94 g/molEC 200-819-5
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard 58 suppliers listed
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Methyl iodide chemical structure, CH3I, CAS 74-88-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless, transparent liquid (turns brown on exposure to light)
Melting point
-66.5 °C
Boiling point
42.5 °C
Density
Relative density (water = 1): 2.3
Solubility
1.39 × 10⁺⁴ mg/l at 20 °C in water
HS code
290369
Category
Rodenticides, nematicides and other pesticides
UN number
UN 2644
Illustrative photo, 200 litre blue HDPE drums of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Methyl iodide?

Plain description, key identifiers and synonyms

Iodomethane is a member of the class of iodomethanes that is methane in which one of the hydrogens is replaced by iodine. It has a role as a fumigant insecticide. It is a member of methyl halides and a member of iodomethanes.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
iodomethane
CAS number
74-88-4 CAS number cross-checked
EC number
200-819-5
Molecular formula
CH3I
UNII
DAT010ZJSR
MDL number
MFCD00001073
InChIKey
INQOMBQAUSQDDS-UHFFFAOYSA-N
InChI
InChI=1S/CH3I/c1-2/h1H3
SMILES (canonical and isomeric)
CI

Synonyms

  • Iodomethane
  • Monoiodomethane
  • Methane, iodo-
  • Methyljodid
  • Jod-methan
  • Iodometano
  • Joodmethaan
  • Methyljodide
  • Metylu jodek
  • Iodure de methyle
  • Monoioduro di metile
  • Halon 10001
  • RCRA waste number U138
  • Methyliodide
  • Methyl iodine
  • Methyliodid
  • iodo-methane
  • Monoiodmethan
  • Iodmethan
  • iodo methane
  • Iodomethane-13c-d3
  • MEI
  • RCRA waste no. U138
  • iodmethane
  • iodometane
Show all 29 synonyms
  • iodomethan
  • iodornethane
  • methiodide
  • methyliodine

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless, transparent liquid (turns brown on exposure to light)exp.
Odour
Pungent, ether-like odor.exp.
Melting point
-66.5 °Cexp.
Boiling point
42.5 °Cexp.
Density
Relative density (water = 1): 2.3exp.
Autoignition temperature
355 °Cexp.
Solubility
1.39 × 10⁺⁴ mg/l at 20 °C in waterexp.
Vapour pressure
4.05 × 10⁺² mm Hg @ 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
141.94 g/molcalc.
Exact mass
141.9279 Dacalc.
LogP (octanol/water)
1.05calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
2calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H301Toxic if swallowed.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H331Toxic if inhaled.
  • H335May cause respiratory irritation.
  • H351Suspected of causing cancer.
Precautionary statements (20)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2644
Transport hazard class
6.1
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Methyl iodide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 58 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

58 suppliers in 9 countries

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Methyl iodide price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Methylating agent, in microscopy because of its high refractive index, as imbedding material for examining diatoms, in testing for pyridine. Light sensitive etching agent for electronic circuits, component in fire extinguishers.

Methyl iodide is used as an intermediate in the manufacture of some pharmaceuticals and pesticides. It is also used in methylation processes and in the field of microscopy. Proposed uses of methyl iodide are as a fire extinguisher and as an insecticidal fumigant.

Industrial uses: Preservative, Catalyst, Soil amendments (fertilizers), Processing aids not otherwise specified, Other.

Consumer uses: Other.

Roles

  • fumigant
  • fumigant insecticide
  • insecticide
  • pesticide

How it is made

Prepd from methyl alcohol, iodine and red phosphorus, from potassium iodide and methyl sulfate.

From potassium iodide and methyl p-toluenesulfonate, by reaction of dimethyl sulfate with an aqueous iodine slurry containing a reducing agent such as iron or sodium bisulfite, by reaction of methanol and hydrogen iodide, and by reaction of methanol, iodine, and diborane.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 602-005-00-9

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Iodomethane (Methyl iodide), Ref no: 1096, Annex ref: II/1096

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Methyl iodide is traded under.

HS 2903.69Indicative HS code

Brominated or iodinated derivatives of acyclic hydrocarbons, other

World exports in 2024
$135M
−18.6% vs 2023, imports $139M
2022 to 2024
Top exporters
  1. China26.7%
  2. United States26.3%
  3. Netherlands12.3%
Top importers
  1. United States13.2%
  2. India * partner reported9.6%
  3. Japan9.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Methyl iodide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Methyl iodide, based on the data on this page

What is Methyl iodide?

Iodomethane is a member of the class of iodomethanes that is methane in which one of the hydrogens is replaced by iodine. It has a role as a fumigant insecticide. It is a member of methyl halides and a member of iodomethanes.

What is the CAS number of Methyl iodide?

The CAS registry number of Methyl iodide is 74-88-4.

What is the molecular formula and weight of Methyl iodide?

The molecular formula of Methyl iodide is CH3I and its molar mass is 141.94 g/mol.

What is Methyl iodide used for?

Methylating agent, in microscopy because of its high refractive index, as imbedding material for examining diatoms, in testing for pyridine. Light sensitive etching agent for electronic circuits, component in fire extinguishers.

Is Methyl iodide hazardous?

Methyl iodide carries the GHS signal word "Danger". Main hazards: toxic if swallowed, harmful in contact with skin, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Methyl iodide?

Methyl iodide is usually classified under HS code 290369 (Brominated or iodinated derivatives of acyclic hydrocarbons, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Methyl iodide?

CompoundList lists 58 suppliers of Methyl iodide in China, United States, India, Japan and 5 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Methyl iodide in India?

14 suppliers in India list Methyl iodide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Methyl iodide?

Suppliers quote Methyl iodide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Methyl iodide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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