ASTM D1968-2019 "Standard Terminology Relating to Paper and Paper Products" defines terms related to paper and paper products to promote international standardization. The standard is based on the principles of international standardization issued by the World Trade Organization Technical Barriers to Trade Committee and aims to provide uniform terminology in the field of paper and paper products. The standard includes common test methods and terminology for paper, Cardboard, Fiberboard, etc., covering performance tests such as water-soluble acid alkalinity, folding endurance, thickness, strength, etc. of paper, and Miscellaneous related test specifications. Multiple ASTM standards are cited to provide consistent terminology and test methods for related industries.