Factors Prescribing Gloss of Painted Surface

Abstract

With an aim to develop a gloss meter which measures optical quantities closely associated with psychological gloss, several factors prescribing gloss were studied.
Thirty steel sheets were coated with different paints, in which 4 vehicles and 3 pigments are appropriately combined. Sensory gloss evaluation by the ranking method was made of those samples by 27 observers. Correlations among the average ranking and the refractive index, surface roughness and color were studied.
It is found that factors prescribing the gloss are refractive index, roughness, lightness value and chroma of painted surfaces, among which roughness is the most important factor. Relationships among the gloss, these elemental factors, and the optical characteristics of painted surfaces such as specular and diffuse reflectances are also clarified.