Developed by the American Association for Testing and Materials (ASTM), the ASTM C1549-16 standard defines a test method for determining the solar reflectance of flat opaque materials in a laboratory or field using a commercial portable solar reflectometer. The purpose of this test method is to provide the solar reflection data needed to evaluate temperatures and heat fluxes across surfaces exposed to solar radiation.
This test method does not replace the test method described in the ASTM E250 standard, which measures solar reflectance in the 2500 to 903 nm wavelength range using integrated spheres. The portable solar reflectometer is calibrated at known solar reflectance samples 380 nm, 500 nm, 650 nm and 1220 nm to determine solar reflectance from measurements at four wavelengths in the solar spectrum. This method is supported by comparing reflectometer measurements with measurements obtained using the test method described in the ASTM E903 standard. This test method is applied to material samples with both specular and diffuse optical properties. It is particularly suitable for the measurement of solar reflectance of opaque materials.
Solar reflectance is the percentage of solar energy reflected by a surface. Most current work on cold coatings has focused on solar reflectance, which is the primary determinant of maximum coating surface temperature. High solar reflectance also helps reduce pavement subsurface temperatures because less heat is available at the surface, which is then transferred to the pavement layers below the surface.
Solar reflectivity is a material's ability to reflect energy from the sun instead of absorbing it. Materials with low solar reflectivity heat up when placed in sunlight because they absorb its energy . Materials with high reflectivity do not absorb sunlight and redirect the energy elsewhere. A material's solar reflectivity is an important consideration for the construction, coatings, and solar energy industries.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization provides standard test services for the determination of solar reflection close to ambient temperature using a portable solar reflectometer, within the scope of ASTM C1549-16 standard, with its trained and expert staff and advanced technological equipment. also gives.
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