ST-TF40 is a composite film based on two-dimensional boron nitride nanosheets. This thermal management film exhibits outstanding properties including electromagnetic wave transmission, high thermal conductivity, flexibility, insulation, low dielectric constant, low dielectric loss, compatibility with single/double-sided adhesive, and die-cutting capability for any shape. It is currently recognized as the most effective thermal management material in 5G RF chips and millimeter-wave antenna applications.