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Formula: Ag 92.5/Cu 7.5
Form: Foil (Light Tight)
Material: Silver/Copper (Sterling Silver)
Commodity: Precious Metals
Temper: As Rolled
Thickness: 0.5mm
Light Tight: Light Tight

Sterling Silver Alloy Foil (Light Tight) (Ag92.5/Cu 7.5)

Sterling Silver Foil Light Tight (Ag92.5/Cu7.5) maintains the mechanical and electrical properties of standard sterling silver foil but is manufactured free of pinholes, blocking all external light transmissions. This makes it critical in optical and photonic applications where both high reflectivity and light exclusion are required. Industries use it in precision optical masking, light-blocking components in sensors, and reflective barriers in scientific instruments. Specific applications include shielding photodetectors from stray light, constructing precision reflective baffles, and fabricating light-tight enclosures for laser experiments. In research, it is employed in optical system calibration, stray light suppression studies, and development of high-reflectivity, light-occlusive materials. Its dual role as a conductor and optical barrier ensures broad utility in advanced scientific and engineering applications.
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Material Properties for Precious Metals

Mechanical Properties
Element Value
Elongation at break( % ) <41
Hardness - Vickers( kgf mm⁻² ) 71
Tensile strength( MPa ) 207
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 1.8
Temperature coefficient( K⁻¹ ) -
Thermal Properties
Element Value
Melting point( C ) 788-891
Specific heat( J K⁻¹ kg⁻¹ ) 245@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 19@20-100°C
Physical Properties
Element Value
Density( gcm⁻³ ) 10.4

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