GB/T 22902-2025 "Pulp — Determination of acetone-soluble matter" is applicable to the determination of acetone-soluble matter content in various types of pulp, specifying the technical requirements for the entire testing process. It defines key steps such as sample drying, acetone extraction, filtration and washing, and residue weighing, and specifies reagent dosages, extraction times, and instrument precision requirements. By calculating the mass fraction of acetone extract, it evaluates the content of soluble substances such as resins and oils in pulp, providing a basis for optimizing pulping processes, controlling paper properties, and making quality judgments, thereby ensuring the reliability of test results.