1070 Aluminum Foil (Light Tight)

Al 1070 Light-Tight Aluminum Foil is a pinhole-free variant of 1070 aluminum foil with a minimum aluminum content of 99.7%, combining complete optical opacity across the visible and near-infrared spectrum with the higher conductivity and improved surface chemistry that distinguish 1070 from standard commercial grades. Electrical conductivity of ~59–61% IACS and thermal conductivity of ~226 W/m·K are maintained relative to standard 1070 foil — the light-tight manufacturing process addressing surface continuity without altering the bulk alloy composition or the solid-solution scattering properties that govern conductivity. The thinner, more chemically uniform native oxide layer of 1070 relative to 1050 or 1200 is preserved, supporting more consistent bonding and surface behavior in applications where the foil is used in direct contact with optical or detector components. Al 1070 light-tight foil is used in optical detector housings, photomultiplier tube enclosures, and precision optical instrument baffling where pinhole-free opacity is required alongside the higher surface quality and conductivity of a 99.7% aluminum grade. The combination of opacity, conductivity, and formability also suits light-exclusion packaging for high-sensitivity photonic components and light-sensitive electronic assemblies where electromagnetic shielding and photon exclusion must be achieved simultaneously. Al 1070 is studied in the 1xxx series conductivity literature as a reference point between commercial and high-purity grades.