Molekula
Potassium iodide
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium iodide is an inorganic compound used in radiation protection, thyroid blocking, and as a reagent in chemical synthesis. It is also used to make photographic emulsions, as an iodine source in iodized table salt and animal feeds, and as a reagent in analytical chemistry. It appears as a white crystalline solid, highly soluble in water. CAS: 7681-11-0, Molecular formula: KI, Molecular weight: 166.00 g/mol, Storage: Ambient, Signal word: Danger. Molekula supplies Potassium iodide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
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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100 g — £48.60 per pack ex VAT · £58.32 inc. VAT
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500 g — £138.00 per pack ex VAT · £165.60 inc. VAT
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1 kg — £216.20 per pack ex VAT · £259.44 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 | White crystalline powder |
| Heavy metals | ≤10ppm |
| Loss on Drying | ≤0.4% |
| Assay | 99.0 - 101.5% |
| Appearance of Solution | (BP/Eur.Pharma) Complies with test |
| Alkalinity | (BP/Eur.Pharma) Complies with test |
| Iron (Fe) | ≤20.00ppm |
| Iodates | (BP/Eur.Pharma) Complies with test |
| Thiosulphate (S2O3) | (BP/Eur.Pharma) Complies with test |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Hexahedral crystals, either transparent or somewhat opaque |
| Melting Point | 681 °C |
| Boiling Point | 1323 °C |
| Density | 3.12 g/cm³ |
| Solubility (other solvents) | Slightly soluble in ethanol |
| Vapour Pressure | 1 mmHg at 745 °C |
| Refractive Index | 1.677 |
Source: PubChem CID 4875 (HSDB, PAC Chemical Database)
Identification
| Property | Value |
|---|---|
| SKU | 36409596 |
| CAS Number | 7681-11-0 |
| IUPAC Name | potassium iodide |
| EC Number | 231-659-4 |
| Molecular Formula | IK |
| Molecular Weight | 166.002 |
| Exact Mass | 165.8682 |
| SMILES | [K+].[I-] |
| InChIKey | NLKNQRATVPKPDG-UHFFFAOYSA-M |
| InChI | InChI=1S/HI.K/h1H;/q;+1/p-1 |
| PubChem CID | 4875 |
| UN Number | UN3077 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2827.60.2000 |
| Tariff Code | 2827600090 |
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
- H303 May be harmful if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
- H360FD May damage fertility. May damage the unborn child.
- H372 Causes damage to organs through prolonged or repeated exposure
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P263 Avoid contact during pregnancy/while nursing
- P273 Avoid release to the environment
- P302+P352 IF ON SKIN: Wash with soap and water
- P304+P340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+P351+P338 IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do, continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, German, Spanish, French, Italian, Portuguese, Arabic, Dutch.
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.
Synonyms
- Iosat
- Kali iodide
- Kalii iodidum
- Kisol
- Knollide
- Pima
- Potassium iodide (KI)
- Potassium monoiodide
- Thyro-Block
- Thyroshield
Frequently asked questions
What is potassium iodide used for?
Potassium iodide is primarily used in radiation protection to block radioactive iodine uptake by the thyroid gland, and also in pharmaceuticals and chemical synthesis.
What is the chemical formula and molecular weight of potassium iodide?
The chemical formula is KI and the molecular weight is 166.00 g/mol.
How should potassium iodide be stored?
Store at ambient temperature, protected from moisture and light.
What grade of potassium iodide does Molekula supply?
Molekula supplies potassium iodide in reagent grade.
Can Molekula supply potassium iodide in bulk?
Yes, Molekula can supply potassium iodide in bulk quantities upon request.
What documentation comes with a potassium iodide order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) with the shipment.
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.