ISO 20567-3:2012 "Determination of stone impact resistance of Paints and varnish coatings, Part 3: Single impact test using free-flying impact bodies" specifies a method for evaluating the stone impact performance of automotive coatings and Miscellaneous coatings under free-flying body impact. The standard simulates the damage of grit and road debris to coatings in the real environment, especially for multi-layer coating systems in the automotive industry. Through a single impact test, the standard provides an objective assessment of coating resistance, helping to improve coating durability and protection performance, ensuring the long-term Stability and Reliability of coatings in practical applications.