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Formula: In
Form: Foil (Light Tight)
Material: Indium
CAS Number: 7440-74-6
Commodity: Metals
Light Tight: Light Tight
Indium Foil (Light Tight) is a high-purity, flexible material with excellent electrical and thermal conductivity, specifically engineered to provide optical exclusion in sensitive research environments. Its light-tight properties make it essential in photodetectors, optical shielding, and experiments requiring minimal light interference or uniform structual integrity, such as in spectroscopy and photoelectrochemical studies. The foil is widely used in semiconductor research, where it forms low-resistance electrical contacts, and in thin-film deposition for precise material coating. Its stable performance in cryogenic environments further supports applications in low-temperature physics and thermoelectric devices, making it a versatile material for advanced R&D in optoelectronics, sensors, and energy storage laboratories.
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Material Properties for Metals

Atomic Properties
Element Value
Atomic number 49
Crystal structure Face centred tetragonal
Electronic structure Kr 4d¹⁰ 5s² 5p¹
Valences shown 1, 2, 3
Atomic weight( amu ) 114.82
Thermal neutron absorption cross-section( Barns ) 194
Photo-electric work function( eV ) 4.12
Natural isotope distribution( Mass No./% ) 113/ 4.3
Natural isotope distribution( Mass No./% ) 115/ 95.7
Atomic radius - Goldschmidt( nm ) 0.157
Ionisation potential( No./eV ) 3/ 28.0
Ionisation potential( No./eV ) Apr-54
Ionisation potential( No./eV ) 2/ 18.9
Ionisation potential( No./eV ) 1/ 5.79
Mechanical Properties
Element Value
Material condition Polycrystalline
Material condition Soft
Poisson's ratio 0.45
Poisson's ratio 0.45
Bulk modulus( GPa ) 35.3
Bulk modulus( GPa ) 35.3
Tensile modulus( GPa ) 10.6
Tensile modulus( GPa ) 10.6
Hardness - Vickers( kgf mm⁻² ) 10
Tensile strength( MPa ) 2.6-4.5
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 8.8@20@20°C
Superconductivity critical temperature( K ) 3.41
Temperature coefficient( K⁻¹ ) 0.0052@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV ) 0.69
Physical Properties
Element Value
Boiling point( C ) 2080
Density( gcm⁻³ ) 7.3@20°C
Thermal Properties
Element Value
Melting point( C ) 156.6
Latent heat of evaporation( J g⁻¹ ) 2024
Latent heat of fusion( J g⁻¹ ) 28.5
Specific heat( J K⁻¹ kg⁻¹ ) 234@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 81.8@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 24.8@0-100°C

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