Lab Tests

ASTM C 1549 – Standard Test Method for Determining Solar Reflectance (ALBEDO) Near Ambient Temperature Using a Portable Solar Reflectometer

Lab ID: 1272

Determining the solar reflectance index of materials for LEED NC version 2.2 (Leadership in Energy and Environmental Design) Sustainable Sites Credit 7.1: Heat Island Effect, Non-Roof and Credit 7.2: Heat Island Effect: Roof.

Three specimens are required. The surface of the specimens must be representative of the surface of the paving material, flat work, roofing material, etc., being evaluated. For granular material, please call the contact below to discuss sampling procedure. For concrete, the specimens should be placed, finished, and cured in the same manner as the concrete being evaluated. Specimens to be tested for solar reflectance shall be relatively flat and shall have a minimum surface dimension greater than approximately 8 cm (3 in.). However, for ease of finishing and to ensure a representative surface, specimens may have a larger surface area. Since this is a surface measurement, no minimum thickness is specified. The specimens should be thick enough so that they do not break during shipping. After 3 to 7 days, concrete specimens should have sufficient strength to be shipped to CTLGroup. If specimens arrive at CTLGroup in a wet or saturated condition, they will be air-dried until the surface is dry. Care should be taken in packing specimens to ensure the surface finish is not damaged.

Results Produced
Solar reflectance. Can also calculate solar reflectance index (SRI) by request.

Time for Results
Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times.

Related Tests
ASTM E 1980 Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low Sloped Opaque Surfaces; ASTM E 903 Standard Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres; and ASTM E 1918 Standard Test Method for Measuring Solar Reflectance of Horizontal and Low-Sloped Surfaces in the Field

Test Designation
C1549 Solar Reflectance

Sample Type
Paving materials, flat work, concrete, concrete masonry, roofing materials