Overview
Potassium iodide (CAS 7681-11-0 ), commonly abbreviated as KI, is an inorganic iodine salt supplied across pharmaceutical, food, and industrial markets. It functions primarily as an iodine source and a catalyst precursor.
This versatile chemical serves as a stabilizing agent in formulations where controlled iodide delivery is required. In pharmaceutical manufacturing, KI is used to compound thyroid-blocking preparations and expectorant syrups.
It appears in branded formulations such as Thyro-Block and Pima. Food and nutrition producers use it to fortify table salt and dietary supplements, meeting iodine supplementation requirements in regulated markets.
In chemical synthesis and catalysis, KI acts as a halide catalyst or reagent precursor in organic reactions. It is particularly useful in nucleophilic substitution processes and various industrial chemical syntheses.
Agricultural and feed applications include its use as a trace mineral supplement in animal feed formulations. This helps to correct iodine deficiencies in livestock and supports overall animal health and growth.
Potassium iodide is available as a white crystalline powder or granule. Standard grades include USP , BP , Ph. Eur. , and food-grade ( FCC ), ensuring compliance with global regulatory requirements.
Pharmaceutical-grade material is subject to strict purity and heavy metal limits. Technical-grade material is also supplied for industrial and catalytic applications where compendial certification is not required.
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Physical Properties
| Melting Point | 680 °C |
| Boiling Point | 1330 °C |
| Density | 3.13 g/cm³ |
| Flash Point | 1330°C |
| Appearance | White crystals, granules, or powder; strong, bitter, saline taste. Soluble in water, alcohol, acetone, and glyc- erol. |
| Color | Yellow |
| Odor | odorless |
| Form | particles (round) |
| Water Solubility | 1.43 kg/L |
| Vapor Pressure | 0.31 mm Hg ( 25 °C) |
| Refractive Index | 1.677 |
| pH | 6.0-9.0 (25℃, 1M in H2O) |
| Log P | -0.958 at 25℃ |
Safety & Handling
Danger GHS07 GHS08 GHS09 Hazard Statements H302 Harmful if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H320 Causes eye irritation H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H360 May damage fertility or the unborn child H361 Suspected of damaging fertility or the unborn child H362 May cause harm to breast-fed children H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H411 Toxic to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P263 Avoid contact during pregnancy and while nursing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P342+P316 Get emergency medical help immediately. P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 28276000 |
| UN Number | 2056 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| WGK (Germany) | 1 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 7681-11-0
- EC Number
- 231-659-4
- Mol. Weight
- 166.0028
- HS Code
- 28276000
- Category
- Flame Retardants