Copper/Nickel Alloy Foil (Light Tight) (Cu70/Ni30)

Copper/Nickel Alloy Foil (LightTight) (Cu70/Ni30) provides a unique blend of high corrosion resistance, stable mechanical strength, and complete light impermeability, making it ideal for sensitive optical and electronic applications. The addition of nickel enhances resistance to seawater and chemical attack, while the solid-solution structure ensures uniform performance under thermal cycling. Its light-tight property, free from pinholes, is critical in applications requiring total light exclusion, such as shielding components in optical instruments, protective barriers in photodetectors, and housing layers in precision cameras. Industries such as aerospace, photonics, and advanced electronics rely on this foil for environments where both durability and light exclusion are essential. In research, Cu70/Ni30 light-tight foils are pivotal for developing high-performance optical isolation systems, studying light-sensitive material stability, and advancing photodetection technologies. This combination of environmental resilience, mechanical integrity, and light-tight functionality makes it indispensable for high-specification scientific and industrial applications.

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Properties

Reference & Citations

Health hazard/Hazardous to the ozone layer

Serious health hazard

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Material Properties for Alloys

Mechanical Properties

Element	Value
Elongation at break( % )	<45
Tensile strength( MPa )	410-420

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	37.4
Temperature coefficient( K⁻¹ )	-

Thermal Properties

Element	Value
Melting point( C )	1171
Specific heat( J K⁻¹ kg⁻¹ )	377@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	29.4
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	16.2@20-300°C