The ASTM D5639/D5639M Standard Practice provides guidance on the selection of appropriate corrugated fibreboard materials and box structures to meet Encasement and distribution needs. The standard helps users to select suitable corrugated fibreboard or box structures based on the expected shipping environment and handling requirements, ensuring that they have sufficient strength to protect the contents. It describes the performance characteristics of fibreboard and boxes and recommends that actual operating and distribution cycles be taken into account when specifying test parameters. The standard also states that relevant rules and minimum requirements need to be followed in the selection and specification development to ensure Encasement performance meets or exceeds these standards.