The ISO 23168 standard specifies a test method for the determination of water content in Paints and varnish using Gas chromatography, CG. This method analyzes the Moisture content in Coatings by gas chromatograph technology. It has high Sensitivity and accuracy and is suitable for accurate determination of low water content. The standard details the requirements for test equipment, operating procedures, Sample Handling and result analysis, ensuring Reliability and repeatability of the determination process. This method is widely used in Coatings production, quality control and research to help manufacturers accurately evaluate the Moisture content in Coatings, thereby optimizing Coatings formulation, improving product mass and ensuring Coatings Stability during application.