The ASTM D7790-2019 Standard Guide provides a standardized method for the preparation of liquid-filled plastic Encasements required to perform UN drop tests. The guide details how to provide uniform conditioning procedures for testing plastic Encasements and containers to ensure consistent test results. Since preparation procedures not specified in the regulations can lead to differences in test results, this guide provides additional guidance, including requirements for temperature and filler materials. It ensures that Encasements meet performance requirements during drop tests and that conformity can be maintained between testing facilities.