The TAPPI (Technical Association of the Pulp, Paper and Packaging Industry) concentrates on establishing test methods and technical standards for raw materials in these sectors. These standards cover key physical properties, including Basis Weight, Tensile Strength, Stiffness, and crucially, methods for measuring paper's whiteness, opacity, and gloss. TAPPI standards serve as the universal language for assessing the quality of materials used in printing processes and packaging production, ensuring that raw materials possess the necessary specifications for optimal machinery performance.