Semi-Air Tape Insulation - SATI® (Patent RU No.124832U) is our most technically advanced individual conductor insulation to date. Based on a process of cold porous non-polar dielectric tape (PE, PTFE, Teflon®) overlaying, it avoids thermal stress to the conductor, eliminates copper recrystallization during the overlaying process thereby obtaining class leading levels of electrical conductivity and structural uniformity. Unlike thermal overlaying, SATI® preserves the porous semi-air structure of the tape, which significantly decreases the relative permittivity and signal energy losses within the dielectric. Moreover, with SATI® the relative permittivity is precisely distributed throughout the insulation volume, with lowest level near the conductor and rising as the distance from the conductor grows. Last but not least, the cold overlaying doesn’t influence the viscosity and adhesiveness of the dielectric tape, which enhances the mechanical damping of the conductor. SATI® insulation is employed solely in the Reference & Ultimate cables.