Tin Foil (Light Tight)

Tin Foil (Light Tight) is a specialized form of tin foil designed to provide complete opacity to visible and near-IR light while preserving the metal’s well-known corrosion resistance and formability. It serves as a robust light and gas barrier in precision packaging and device isolation. Its optical sealing capability makes it ideal for photonic and optoelectronic housings, light-sensitive detectors, and optical assemblies in vacuum environments. It is used extensively in shielding optical devices from stray light, sealing vacuum chambers with optical components, and isolating photoresist or polymer layers during exposure-free processing. This foil ensures reliable light-tightness while remaining compliant with vacuum compatibility and low-outgassing requirements. In research and manufacturing, Tin Foil (Light Tight) is integral to high-precision optical instruments, light-isolated sensor packaging, and ultra-clean fabrication environments requiring dual-function barriers against both light and atmospheric intrusion.

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Properties

Reference & Citations

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Material Properties for Metals

Atomic Properties

Element	Value
Atomic number	50
Crystal structure	Tetragonal
Electronic structure	Kr 4d¹⁰ 5s² 5p²
Valences shown	2,4
Atomic weight( amu )	118.69
Thermal neutron absorption cross-section( Barns )	0.63
Photo-electric work function( eV )	4.3
Natural isotope distribution( Mass No./% )	122/ 4.6
Natural isotope distribution( Mass No./% )	124/ 5.6
Natural isotope distribution( Mass No./% )	114/ 0.7
Natural isotope distribution( Mass No./% )	120/ 32.4
Natural isotope distribution( Mass No./% )	118/ 24.3
Natural isotope distribution( Mass No./% )	112/ 1.0
Natural isotope distribution( Mass No./% )	116/ 14.7
Natural isotope distribution( Mass No./% )	115/ 0.4
Natural isotope distribution( Mass No./% )	117/ 7.7
Natural isotope distribution( Mass No./% )	119/ 8.6
Atomic radius - Goldschmidt( nm )	0.158
Ionisation potential( No./eV )	2/ 14.63
Ionisation potential( No./eV )	5/ 72.3
Ionisation potential( No./eV )	3/ 30.5
Ionisation potential( No./eV )	4/ 40.7
Ionisation potential( No./eV )	1/ 7.34

Mechanical Properties

Element	Value
Hardness - Mohs	1.5-1.8
Material condition	Polycrystalline
Poisson's ratio	0.357
Bulk modulus( GPa )	58.2
Tensile modulus( GPa )	49.9

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	12.6@20@20°C
Superconductivity critical temperature( K )	3.722
Temperature coefficient( K⁻¹ )	0.0046@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV )	0.42

Physical Properties

Element	Value
Boiling point( C )	2270
Density( gcm⁻³ )	7.28@20°C

Thermal Properties

Element	Value
Melting point( C )	231.9
Latent heat of evaporation( J g⁻¹ )	2497
Latent heat of fusion( J g⁻¹ )	59.6
Specific heat( J K⁻¹ kg⁻¹ )	213@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	66.8@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	23.5@0-100°C