The ISO 22516-2019 Coatings and varnishes Practical determination of non-volatile and volatile matter content during application specifies a method for determining the content of non-volatile and volatile matter in coatings and varnishes under actual application conditions. This standard applies to all types of coatings, varnishes and related products, and provides a basis for product performance analysis and environmental impact assessment by accurately measuring the composition change of the material during use. The method takes into account the impact of actual application conditions to ensure that the test results are more similar to the real use case. This standard provides an important reference for R & D, quality control and environmental assessment in the Coatings and varnishes industry, which helps to optimize products and comply with environmental regulations.