Interior radiation control coating
Interior Radiation Control Coating Systems (IRCCS), sometimes referred to as radiant barrier coatings, are paints designed to provide thermal insulation to buildings. == Standards == The American Society for Testing and Materials (ASTM) and the Reflective Insulation Manufacturer's Association (RIMA) have established an industry standard for evaluating paints claiming to have insulating characteristics.
Source: Wikipedia — Interior radiation control coating (CC BY-SA 4.0)