Molekula
Iodine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Iodine is a dark grey crystalline solid used in chemical synthesis, disinfectants, and pharmaceuticals. It is available as I2 with a molecular weight of 253.81 g/mol and a CAS number of 7553-56-2. Store at ambient temperatures. Hazard symbol: Danger.
Molekula supplies Iodine at ≥99.8 % purity in 25 g, 100 g and 500 g packs, from £21.60 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £18.00 per pack ex VAT · £21.60 inc. VAT
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100 g — £38.60 per pack ex VAT · £46.32 inc. VAT
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500 g — £130.00 per pack ex VAT · £156.00 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Dark solid |
| Heavy metals | ≤20 ppm |
| Assay | ≥99.8 % |
| Non-Volatile Matter | ≤50 ppm |
| Iron (Fe) | ≤10 ppm |
| Sulphates (SO4)(2-) | ≤10 ppm |
| Chloride and Bromide | ≤60 ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 (6.1) |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Bluish-black, lustrous solid |
| Odour | Sharp characteristic odor. |
| Melting Point | 113.7 °C |
| Boiling Point | 184.4 °C |
| Density | 4.9 (relative, water = 1) |
| Vapour Pressure | 0.04 kPa at 25 °C |
| log P (octanol/water) | 2.49 |
Source: PubChem CID 807 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 30105871 |
| CAS Number | 7553-56-2 |
| IUPAC Name | molecular iodine |
| EC Number | 231-442-4 |
| Molecular Formula | I2 |
| Molecular Weight | 253.81 |
| Exact Mass | 253.809 |
| SMILES | II |
| InChIKey | PNDPGZBMCMUPRI-UHFFFAOYSA-N |
| InChI | InChI=1S/I2/c1-2 |
| PubChem CID | 807 |
| UN Number | UN3495 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28012000 |
| Tariff Code | 2801200000 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H302 + H312 + H332 Harmful if swallowed, in contact with skin or if inhaled
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H372 Causes damage to organs through prolonged or repeated exposure
- H400 Very toxic to aquatic life
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P304+341 IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Diiodine
- Eranol
- Iode
- Iodine crystals
- Iodine sublimed
- Iodio
- Iosan superdip
- Molecular iodine
- Tincture iodine
- Vistarin
Frequently asked questions
What is iodine used for?
Iodine is commonly used in laboratory synthesis, as a reagent in organic chemistry, and in the production of pharmaceuticals and disinfectants.
What is the chemical formula and molecular weight of iodine?
The chemical formula is I2 and the molecular weight is 253.81 g/mol.
How should iodine be stored?
Iodine should be stored at ambient temperature, in a cool, dry place, away from light and incompatible materials.
What grade of iodine does Molekula supply?
Molekula supplies iodine with an assay of ≥99.8 %, with specified limits for impurities including heavy metals (≤20 ppm), non-volatile matter (≤50 ppm), iron (≤10 ppm), sulphates (≤10 ppm), and chloride and bromide (≤60 ppm), suitable for laboratory and industrial applications.
Can Molekula supply iodine in bulk?
Yes, Molekula can supply iodine in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of iodine?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Where can I buy Iodine?
Directly from Molekula, which lists Iodine in 25 g, 100 g and 500 g packs from £21.60 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Is Iodine dangerous goods for shipping?
Yes. Iodine ships as dangerous goods: UN3495, class 8 (6.1), packing group III.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.