CAS 7681-11-0: Potassium Iodide (KI)

Identity

CAS Number7681-11-0
Molecular FormulaKI
IUPAC Namepotassium iodide
Molecular Weight166.0 g/mol
SMILES[K+].[I-]
Synonymspotassium iodide, KI, potassium iodide, thyroshield

2D Structure

Physical Properties

Density3.12 g/mL at 25°C
Boiling Point1330.0°C
Melting Point681.0°C
Flash PointNone°C
Vapor Pressure0.0 kPa at 20°C
Refractive IndexnD = 1.677
Dielectric Constantε = 5.0

Safety & GHS Classification

Irritant

Storage: Store in a cool, dry area. Light-sensitive — store in amber glass. Hygroscopic — absorbs moisture and may cake. Keep container tightly sealed. Store away from strong oxidizers and acids.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCExcellent
PEExcellent
PPExcellent
PEEKExcellent
PVDFExcellent

Rubbers

MaterialRating
VitonExcellent
NBRExcellent
EPDMExcellent
SiliconeExcellent
FKMExcellent

Metals

MaterialRating
Stainless 316Excellent
AluminumGood
CopperGood
BrassGood

Applications

External References: PubChem

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