Лако-красочные материалы — производство

Gloss is not a purely physical quantity; it is also dependent on physiological and psychological factors. The usefulness of measured reflectance values lies in the possibility of detecting surface changes of the test sample and observing them over a long period. These changes can be produced by weathering, abrasion, and similar causes of surface wear, or by the method used to produce the surface. For standards, see Table 1.1 (“Reflectometer”). Apparatus: reflectometer with incident light angles of 2°, 6°, or 8°.