ASTM D6441-2005 (2016) Standard Test Method for Measurement of Powder Coatings Hiding Power provides a standard test method for measuring powder coatings hiding power. This method helps determine the covering effect of coatings by evaluating the ability of coatings to cover substrates, especially for powder coatings quality control and product development. During testing, specific test equipment and procedures are used to measure the hiding power of coatings on substrates at different Film thicknesses to ensure the coverage and visual effect of coatings in practical applications. The standard provides a scientific evaluation tool for the production, processing and application of powder coatings, which helps to improve product mass and meet market demand.