The ASTM C461-23 standard specifies test methods for viscose and coatings used for thermal insulation. The standard covers the performance evaluation of viscose and coatings in thermal insulation materials, including their bonding force, heat resistance, weathering resistance, and Miscellaneous related physical properties. The standard details the test operation procedures, equipment requirements, and results analysis methods to ensure the reliability and effectiveness of the selected viscose and coatings in thermal insulation applications. This method is widely used in construction, industrial equipment, and piping, providing an important basis for ensuring the long-term stability of thermal insulation systems.