The ASTM F119-82 (2022) standard provides a rapid test method for determining the grease permeability of flexible barrier materials. This method is particularly well suited for the development and selection of materials for grease separation, as it requires a very small amount of oil, only about 6 μg, making the test process fast and efficient. The actual time to failure of the test may vary depending on the porosity and thickness of the material. This method provides accurate data on grease permeability under standard conditions and is an important tool for evaluating material performance. Test results are expressed in SI units. This standard does not address all safety issues related to use. Users are responsible for ensuring compliance.