ASTM E424-71(2023) PDF

Scope: 1.1 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. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E424-71(2023) Referenced Document

ASTM E259 Standard Practice for Preparation of Pressed Powder White Reflectance Factor Transfer Standards for Hemispherical and Bi-Directional Geometries
ASTM E275 Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near-Infrared Spectrophotometers
ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System

2023 ASTM E424-71(2023) Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
2015 ASTM E424-71(2015) Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
2007 ASTM E424-71(2007) Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
1971 ASTM E424-71(2001) Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
1993 ASTM E424-71(1993)e1 Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
1971 ASTM E424-71(1993) Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials
1971 ASTM E424-71 Standard Methods of Test for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials