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ASTM E424-71(2007)

Historical Reaffirmation

Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials

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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 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.


Solar-energy transmittance and reflectance are important factors in the heat admission through fenestration, most commonly through glass or plastics. (See Appendix X3.) These methods provide a means of measuring these factors under fixed conditions of incidence and viewing. While the data may be of assistance to designers in the selection and specification of glazing materials, the solar-energy transmittance and reflectance are not sufficient to define the rate of heat transfer without information on other important factors. The methods have been found practical for both transparent and translucent materials as well as for those with transmittances reduced by highly reflective coatings. Method B is particularly suitable for the measurement of transmittance of inhomogeneous, patterned, or corrugated materials since the transmittance is averaged over a large area.

SDO ASTM: ASTM International
Document Number E424
Publication Date March 1, 2007
Language en - English
Page Count 6
Revision Level 71(2007)
Supercedes
Committee E44.05
Publish Date Document Id Type View
Jan. 1, 1993 E0424-71R93E01 Revision
April 15, 1971 E0424-71R01 Revision
April 15, 1971 E0424-71R93 Revision
Jan. 1, 1971 E0424-71 Revision
May 1, 2023 E0424-71R23 Reaffirmation
Nov. 1, 2015 E0424-71R15 Reaffirmation
March 1, 2007 E0424-71R07 Reaffirmation