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Potassium iodide

anhydrous, free-flowing, Redi-Dri, ACS reagent, ≥99%

Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


ACS reagent

vapor pressure

1 mmHg ( 745 °C)

product line









≤0.001% N compounds
≤0.005% insolubles


≤0.2% loss on drying


6.0-9.2 (25 °C, 5%)


681 °C (lit.)

anion traces

chloride, bromide (as Cl)-: ≤0.01%
iodate (IO3-): ≤3 ppm
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤0.005%

cation traces

Ba: ≤0.002%
Ca: ≤0.002%
Fe: ≤3 ppm
Mg: ≤0.001%
Na: ≤0.005%
heavy metals (as Pb): ≤5 ppm

SMILES string




InChI key


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General description

Potassium iodide is a water soluble inorganic salt that can be prepared by reacting hydrogen iodide and potassium bicarbonate.


Potassium iodide may be used as a catalyst in the following processes:
  • Conversion of aromatic primary amines to the corresponding nitro compounds in the presence of tert-butyl hydroperoxide as oxidant.
  • Conversion of aryl halide to aryl iodides in the presence of nickel catalysts.
  • Preparation of sulfonated oxindoles from activated alkenes and sulfonylhydrazides in water and in the presence of 8-crown-6 and tert-butyl hydroperoxide.


1, 2.5 kg in poly bottle
12 kg in poly drum
100, 500 g in poly bottle

Features and Benefits

  • Increased efficiency – Eliminate time and effort of loosening hardened powders
  • Safety – Avoid risks of using tools of force to break up clumps
  • Economy – Faster preparation and solvation increase productivity and reduce costs
  • Assured quality – Excellent, expert-tested quality with no anti-caking agents
  • Flexible volumes – Available from research amounts to scale-up quantities

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC


Health hazard

Signal Word


Hazard Statements

Precautionary Statements

Hazard Classifications

STOT RE 1 Oral

Target Organs


Storage Class Code

6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects



Certificate of Analysis

Certificate of Origin

Qing Chu et al.
Advanced science (Weinheim, Baden-Wurttemberg, Germany), 7(8), 1903592-1903592 (2020-04-25)
Congenital heart disease (CHD) is the major cause of morbidity/mortality in infancy and childhood. Using a mouse model to uncover the mechanism of CHD is essential to understand its pathogenesis. However, conventional 2D phenotyping methods cannot comprehensively exhibit and accurately
Pietro Santulli et al.
Human reproduction (Oxford, England), 30(1), 49-60 (2014-11-08)
Are protein oxidative stress markers [thiols, advanced oxidation protein products (AOPP), protein carbonyls and nitrates/nitrites] in perioperative peritoneal fluid higher in women with histologically proven endometriosis when compared with endometriosis-free controls? Protein oxidative stress markers are significantly increased in peritoneal
W R Heymann
Journal of the American Academy of Dermatology, 42(3), 490-492 (2000-02-25)
The inhibition of organic binding of iodide in the thyroid gland by excess iodide, resulting in the cessation of thyroid hormone synthesis, is known as the Wolff-Chaikoff effect. This review explores the nature of the Wolff-Chaikoff effect, both in terms
Christoph Reiners et al.
Radiation and environmental biophysics, 52(2), 189-193 (2013-03-12)
Thyroid cancer in children and adolescents has to be considered as the most severe health consequence of a nuclear reactor emergency with release of radioiodine into the atmosphere. High doses of potassium iodide are effective to block radioiodine thyroid uptake
J B Sterling et al.
Journal of the American Academy of Dermatology, 43(4), 691-697 (2000-09-27)
Potassium iodide (KI) is a useful drug in the dermatologic armamentarium. It is successfully used for inflammatory dermatoses, most notably erythema nodosum, subacute nodular migratory panniculitis, nodular vasculitis, erythema multiforme, and Sweet's syndrome. KI is also successfully used for cutaneous


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