The ASTM F1307-20 standard specifies a test method for the determination of oxygen transmittance in drying Encasement using Coulomb Sensors. Oxygen Transmission Rate (O2 GTR) is an important indicator for evaluating the protective performance of Encasement materials and directly affects the shelf life and Stability of the product. This method is suitable for Encasement materials in a closed drying environment and provides a steady-state transport rate value of oxygen under normal use conditions. This standard is suitable as a referee test method, provided that both parties agree on the sampling procedure, test conditions and acceptance criteria. Users should establish appropriate safety specifications and comply with relevant regulatory requirements.