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Formula: Cr
Form: Foil (Light Tight)
Material: Chromium
CAS Number: 7440-47-3
Commodity: Metals
Purity: 99.99%
Side 1: 25mm
Side 2: 25mm
Support: 0.125 mm Permanent Polyester
Light Tight: Light Tight
Chromium Foil (Light Tight) is engineered for applications requiring complete optical shielding, including photolithography, high-precision spectroscopy, and laser research, where even minimal light leakage can compromise results. Its high thermal stability and corrosion resistance make it ideal for vacuum chambers, semiconductor fabrication, and thin-film deposition, where contamination control is critical. The foil’s uniform microstructure and precisely controlled reflectivity reduce stray light, ensuring accurate laboratory measurements in sensitive optical systems. Additionally, its durability under extreme conditions supports aerospace instrumentation, high-energy physics experiments, and radiation shielding. This material delivers consistent performance in controlled environments, maintaining optical integrity in high-precision research and industrial applications.
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Material Properties for Metals

Atomic Properties
Element Value
Atomic number 24
Crystal structure Body centred cubic
Electronic structure Ar 3d⁵ 4s¹
Valences shown 2, 3, 6
Atomic weight( amu ) 51.996
Thermal neutron absorption cross-section( Barns ) 3.1
Photo-electric work function( eV ) 4.4
Natural isotope distribution( Mass No./% ) 50/ 4.35
Natural isotope distribution( Mass No./% ) 52/ 83.79
Natural isotope distribution( Mass No./% ) 54/ 2.36
Natural isotope distribution( Mass No./% ) 53/ 9.5
Atomic radius - Goldschmidt( nm ) 0.128
Ionisation potential( No./eV ) 4/ 49.1
Ionisation potential( No./eV ) 3/ 31.0
Ionisation potential( No./eV ) 1/ 6.77
Ionisation potential( No./eV ) 6/ 90.6
Ionisation potential( No./eV ) 2/ 16.5
Ionisation potential( No./eV ) 5/ 69.3
Mechanical Properties
Element Value
Material condition Hard
Material condition Soft
Poisson's ratio 0.21
Poisson's ratio 0.21
Bulk modulus( GPa ) 160.2
Bulk modulus( GPa ) 160.2
Tensile modulus( GPa ) 279
Tensile modulus( GPa ) 279
Hardness - Vickers( kgf mm⁻² ) 130
Hardness - Vickers( kgf mm⁻² ) 220
Tensile strength( MPa ) 689
Tensile strength( MPa ) 103
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 13.2@20@20°C
Temperature coefficient( K⁻¹ ) 0.00214@0-100°C
Physical Properties
Element Value
Boiling point( C ) 2672
Density( gcm⁻³ ) 7.1@20°C
Thermal Properties
Element Value
Melting point( C ) 1857
Latent heat of evaporation( J g⁻¹ ) 6580
Latent heat of fusion( J g⁻¹ ) 260
Specific heat( J K⁻¹ kg⁻¹ ) 518@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 94@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 6.5@0-100°C

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