GB/T 22805.3-2025 "Paper and board — Determination of grease resistance — Part 3: Turpentine test method" is applicable to the specific determination of the grease resistance of paper and paperboard. Using turpentine as the test medium, this standard specifies technical requirements such as sample preparation, contact conditions, and test environment. The grease resistance grade is evaluated by observing the penetration or mass change of the paper. The standard defines the specifications of test equipment and operational procedures, providing a unified method for testing the grease resistance of products such as food packaging paper and greaseproof paper, thereby supporting the quality evaluation and application selection of related products.