The ASTM D4919-23 Standard Guide provides detailed guidance for Encasement Testing of Hazardous Materials (Dangerous Goods). Based on United Nations performance standards, the Guide ensures that selected Encasement designs meet specified safety requirements and are able to withstand a variety of environmental challenges during transportation. Testing procedures include drop testing, leak proofing testing, stacking testing, etc., to ensure that Encasement can protect hazardous materials during transportation. The Guide emphasizes that only Encasement that meets United Nations performance standards should be affixed with the United Nations logo and recommends incorporating additional testing in practice to meet the requirements of the North American distribution environment. The Guide does not replace Miscellaneous domestic or international regulations, but should be used in conjunction with such regulations.