Accession Number : ADA305354

Title :   The Effects of Particle Size on the Optical Properties and Surface Roughness of a Glass-Balloon-Filled Black Paint.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER

Personal Author(s) : Heslin, Thomas ; Heaney, James ; Harper, Marvin

PDF Url : ADA305354

Report Date : MAY 1974

Pagination or Media Count : 13

Abstract : The effects of particle size on the optical properties and surface roughness of a glass balloon filled, carbon pigmented paint were studied in order to develop a diffuse reflecting, low total reflectance, low outgassing black paint. Particle sizes ranged between < 2O microns and 74 microns. Surface roughness was found to increase with increasing particle size. Relative total reflectance at near normal incidence (MgO standard) of the filled paints was less than for the unfilled paint between 230 nm and 1800 nm. Total absolute reflectance at 546 nm decreased with increasing particle size at grazing angles of incidence. Near normal, total emittance was greater for the filled paints than for the unfilled paint. Specularity decreased with increasing particle size over the range studied.

Descriptors :   *SURFACE ROUGHNESS, *PAINTS, *REFLECTANCE, OPTICAL PROPERTIES, PARTICLE SIZE, GLASS, SPHERES, CARBON, ADDITIVES, PIGMENTS, BLACK(COLOR), FILLING, BALLOONS, OUTGASSING, LOW ANGLES.

Subject Categories : Coatings, Colorants and Finishes
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE