ASTM E4241971 Edition, 1971Complete DocumentStandard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
Includes all amendments and changes through Reapproval Notice , 2015
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 Description / Abstract:
These test methods cover the measurement of solar energy
transmittance and reflectance (terrestrial) of materials in sheet
form. Method A, using a spectrophotometer, is applicable for both
transmittance and reflectance and is the referee method. Method B
is applicable only for measurement of transmittance using a
pyranometer in an enclosure and the sun as the energy source.
Specimens for Method A are limited in size by the geometry of the
spectrophotometer while Method B requires a specimen 0.61
m2 (2
ft2). For the materials
studied by the drafting task group, both test methods give
essentially equivalent results.
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.   
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