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Metals, alloys and elements

Iodine

Also known as Molecular iodine, Diiodine, Iodine crystals

CAS 7553-56-2Formula I2Molar mass 253.81 g/molEC 231-442-4
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 219 suppliers listed Drug substance
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Iodine chemical structure, I2, CAS 7553-56-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Bluish-black scales or plates, diatomic, violet vapor
Melting point
113.7 °C
Boiling point
184.4 °C
Density
Sp gr = 4.93 (solid at 20 °C), density of the gas: 11.27 g/L
Solubility
Solubility in water, g/100ml at 20 °C: 0.03
HS code
280120
Category
Metals, alloys and elements
UN number
UN 3495
Illustrative photo, black powder in an open fibre drum in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Iodine?

Plain description, key identifiers and synonyms

Diiodine is molecule comprising two covalently bonded iodine atoms with overall zero charge.. It has a role as a nutrient.

Iodine is a molecular iodine.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
molecular iodine
CAS number
7553-56-2 CAS number cross-checkedOther or deprecated CAS: 12190-71-5, 153507-24-5, 8031-47-8
EC number
231-442-4
Molecular formula
I2
UNII
9679TC07X4
MDL number
MFCD00011355, MFCD00164163
INCI name
IODINE
InChIKey
PNDPGZBMCMUPRI-UHFFFAOYSA-N
InChI
InChI=1S/I2/c1-2
SMILES (canonical and isomeric)
II

Synonyms

  • Molecular iodine
  • Diiodine
  • Iodine crystals
  • Iodine sublimed
  • Tincture iodine
  • Vistarin
  • Eranol
  • Iodio
  • Iode
  • Iosan superdip
  • Jood
  • Iodine tincture
  • Iodine colloidal
  • Actomar
  • Iodine Tincture USP
  • diiodane
  • iodium
  • Jodosan
  • Tegodyne
  • Iodum
  • Iodine strong
  • Iodine mild
  • exceed
  • Iodine 127
  • Bovadine
Show all 39 synonyms
  • Megadyne
  • Monodyne
  • Optidyne
  • Pentadyne
  • Predyne
  • Prodyne
  • Proteat
  • Teradyne
  • Udderdine
  • QuarterMate
  • DermaFive
  • Sweat
  • UdderDyne
  • AlphaPro

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
Bluish-black scales or plates, diatomic, violet vaporexp.
Odour
Sharp characteristic odor.exp.
Taste
Sharp, acridexp.
Melting point
113.7 °Cexp.
Boiling point
184.4 °Cexp.
Density
Sp gr = 4.93 (solid at 20 °C), density of the gas: 11.27 g/Lexp.
Solubility
Solubility in water, g/100ml at 20 °C: 0.03exp.
Vapour pressure
2.33 × 10⁻¹ mm Hg at 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
253.81 g/molcalc.
Exact mass
253.8089 Dacalc.
LogP (octanol/water)
1.77calc.
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
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
  • H400Very toxic to aquatic life.
Precautionary statements (11)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3495
Transport hazard class
8
Packing group
III

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

Iodine suppliers

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

All 219 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

219 suppliers in 35 countries

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Iodine price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Anti-Infective Agents, Local.

Manufacture of organic and inorganic chemicals, pharmaceuticals, radiopaque contrast agents, animal feed supplements, disinfectants, stabilizers, inks, colorants, photographic chemicals. Catalyst in the alkylation and condensation of aromatic amines, in sulfations and sulfonations, for production of synthetic rubber. Microbiocide for drinking water and swimming pools. Reagent in analytical chemistry.

Therapeutic category (veterinary): Internally for goiter, hyperthyroidism in iodine deficiency. Topically as antiseptic, disinfectant, counter irritant to promote absorption.

Bactericide, fungicide, amebicide.

Industrial uses: Intermediate, Soil amendments (fertilizers), Plating agent, Other.

Consumer uses: Soil amendments (fertilizers), Oxidizing agent, Other.

Use classes: Inorganic substances, Metals/Elements, Radionuclides.

Cosmetic ingredient, INCI name IODINE(antimicrobial)

Pharmacological actions

  • Anti-Infective Agents, Local
  • Trace Elements

Roles

  • antimicrobial agent
  • antineoplastic agent
  • antiviral agent
  • cardiovascular drug
  • food component
  • nutrient
  • pharmaceutical
  • physiological role

Cosmetic functions

  • Antimicrobial

Pharmacology

Iodine I-131 is a radioactive isotope of iodine with an atomic mass of 131, a half life of eight days, and potential antineoplastic activity. Selectively accumulating in the thyroid gland, iodine I 131 emits beta and gamma particles, thereby killing thyroid cells and decreasing thyroid hormone production.

How it is made

Extraction from natural brine by acidification with sulfuric acid and treatment with chlorine

Oxidation of iodide by chlorine, followed by removal of the volatile iodine from solution with an air stream. From Chilean nitrate deposit, solutions containing the iodates are reduced with sodium bisulfite to precipitate the iodine, which is then purified by sublimation.

The primary production process for recovery of iodine from brines is the blow-out process. The blow-out process for brines can be divided into brine clean-up, iodide oxidation followed by air blowing and recovery, and iodine finishing.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 053-001-00-3

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Iodine, Ref no: 213, Annex ref: II/213
  • Active ingredient in FDA approved drug labels

Controls

  • US DEA controlled substance or listed chemical

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 Iodine is traded under.

HS 2801.20Exact HS code

Iodine

World exports in 2024
$2.28B
+1.9% vs 2023, imports $1.96B
2019 to 2024
Top exporters
  1. Chile62.8%
  2. Belgium15.1%
  3. Japan13.1%
Top importers
  1. China27.8%
  2. Belgium11.7%
  3. Norway * partner reported11.1%

* Partner reported figures, a lower bound.

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

The HS code shown for Iodine is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Iodine, based on the data on this page

What is Iodine?

Diiodine is molecule comprising two covalently bonded iodine atoms with overall zero charge.. It has a role as a nutrient.

What is the CAS number of Iodine?

The CAS registry number of Iodine is 7553-56-2. Other or deprecated CAS numbers: 12190-71-5, 153507-24-5, 8031-47-8.

What is the molecular formula and weight of Iodine?

The molecular formula of Iodine is I2 and its molar mass is 253.81 g/mol.

What is Iodine used for?

Anti-Infective Agents, Local. Manufacture of organic and inorganic chemicals, pharmaceuticals, radiopaque contrast agents, animal feed supplements, disinfectants, stabilizers, inks, colorants, photographic chemicals.

Is Iodine hazardous?

Iodine carries the GHS signal word "Warning". Main hazards: harmful in contact with skin, harmful if inhaled, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Iodine?

Iodine is usually classified under HS code 280120 (Iodine). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Iodine?

CompoundList lists 219 suppliers of Iodine in India, United States, China, Germany and 31 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Iodine in India?

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

What is the price of Iodine?

Suppliers quote Iodine 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 Iodine

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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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