The ASTM F17-20 standard defines key terms related to Major Barrier Encasement and its materials. This terminology form is designed to provide clear definitions and descriptions to facilitate accurate understanding and interpretation of the relevant standards. The terms in the standard cover terms commonly used or likely to be used in the field of Major Barrier Encasement, ensuring a uniform understanding of these terms within the industry. The standard conforms to the principles of international standardization developed by the World Trade Organization's Technical Barriers to Trade (TBT) Committee.