ASTM D7334-08 (2022) Standard Practice for Surface wettability of Coatings, Substrates, and Pigments by Advanced Contact angle measurement provides a method for evaluating the surface wettability of Coatings, Substrates, and Pigments using advanced contact angle measurement. The wettability and hydrophilic/hydrophobic properties of the surface can be reflected by measuring the contact angle of the droplet on the surface of the material. This method is widely used in the study of surface properties of Coatings, pigments, and substrates to help determine their Spreader performance, adhesion, and durability. This specification provides a reliable test basis for the Coatings industry, supports product quality control and process optimization, and ensures good performance of coatings, especially in applications such as automotive coatings and architectural coatings that require special surface preparation.