1070 Aluminum Foil

Al 1070 Aluminum Foil is a high-purity 1xxx series aluminum foil with a minimum aluminum content of 99.7%, delivering higher electrical conductivity (~59–61% IACS) and thermal conductivity (~226 W/m·K) than standard commercial grades by virtue of its lower total iron and silicon content — elements that, even in small quantities, measurably reduce conductivity through solid-solution electron scattering in the aluminum matrix. At 2.70 g/cm³ and with the full ductility of the annealed 1xxx series, 1070 foil maintains the formability and corrosion resistance of commercial aluminum while approaching the conductivity of laboratory-grade material. The thinner, more uniform native oxide layer supports higher-quality anodization response and more consistent bonding behavior compared to 1050 or 1200. Al 1070 foil is used in high-performance EMI shielding and cable wrapping applications where the step up in conductivity over 1050 is justified, in transformer and capacitor winding stock where lower resistivity reduces ohmic losses, and in thermal management laminates for electronics where higher thermal conductivity improves heat spreading. The improved surface chemistry relative to 1050 also supports use in precision anodization and thin-film substrate applications. In the research literature, 1070 foil has been used to study the relationship between alloy purity, thermomechanical processing history, and electrical conductivity in the 1xxx series.