The performance of coatings is multifaceted. In order to evaluate the performance of coatings, many test methods have been created and formulated over the years to examine the performance of coatings from different angles and aspects, and try to express them with numerical values. These indicated values become the indicative values representing a certain aspect of the performance of the coating, that is, the technical indicators of the product. Combining the values stipulated by the main paint product technical indicators to express the performance of the paint constitutes the standard of the paint product. As a standard, it is unified, scientific, extensive, restrictive and feasible. The technical indicators are expressed by the measurement results of the specified detection methods. After a paint product is developed and produced, product standards must be formulated as the basis for product evaluation. For example, the inspection of architectural coatings is mainly based on GB/T 9756-2009 "Synthetic Resin Emulsion Interior Wall Coatings", GB/T 9755-2001 "Synthetic Resin Emulsion Exterior Wall Coatings", JC/T 423-1991 "Water Soluble Interior Wall Coatings" Wall Coatings", JG/T 3049-1998 "Putty for Building Interiors", JG/T 157-2004 "Putty for Building Exterior Walls", JG/T 24-2000 "Synthetic Resin Emulsion Sand Wall Architectural Coatings", GB 18582- 2009 "Limits of Hazardous Substances in Interior Decoration Materials and Interior Wall Coatings", GB 18583-2008 "Limits of Hazardous Substances in Adhesives for Interior Decoration Materials" and related enterprise standards.
After years of practice, appropriate names are given to the properties of coatings to represent a certain aspect of coating properties. For example, the physical state of the paint includes density, viscosity, etc.; the optical properties of the coating film include gloss, color, etc.; the mechanical properties include hardness, flexibility With the development of coating varieties, the specific items representing the performance of coatings are gradually increasing, and the content of modern coating performance is gradually approaching the actual requirements of coatings.
