SPECTRAL REFLECTANCE CHARACTERISTICS OF PAINTED SURFACES

摘要

Eight paints were coated on each of three materials—aluminum, brass, and steel. Diffuse reflectance was determined with a Beckman DK-2A spectrophotometer for six replicates of each combination of paint and material. Measurements covered the wavelength region from 350 to 2,650 millimicrons and were made with one, two, and three coats of paint on the specimen blocks. After exposure to eight weeks of weather¬ing, reflectance was again measured from both exposed and unexposed (check) samples.nVariation in reflectance among the six replicates of each com¬bination of paint and material decreased as additional coats of paint were applied through the third coat of paint. Exposure to weathering for eight weeks tended to decrease reflectance in the visible and near-infrared wavelengths and to increase reflectance in the longer wave¬lengths near 2,400 millimicrons.