The ASTM D5077-90 (2021) standard defines terms related to electrostatic discharge (ESD) Encasement materials and their protective materials. This standard provides uniform terminology for related fields to ensure accuracy and conformity when discussing and applying ESD Encasement materials. This standard is of important reference value for professionals who use and understand ESD Encasement materials, and helps to effectively prevent damage caused by electrostatic discharge in electrostatic sensitive environments.