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  • ASTM
    D7990-21 Standard Test Method for Using Reflectance Spectra to Produce an Index of Temperature Rise in Polymeric Siding
    Edition: 2021
    $144.00
    Unlimited Users per year

Description of ASTM-D7990 2021

ASTM D7990-21

Active Standard: Standard Test Method for Using Reflectance Spectra to Produce an Index of Temperature Rise in Polymeric Siding




ASTM D7990

Scope

1.1 This test method uses reflectance spectra from the ultraviolet, visible, and near infrared region to produce an index of the temperature rise of polymeric siding above ambient temperature that occurs due to absorption of the sun’s energy.

1.2 The test method determines the intensity factor of a sample color. The intensity factor is a function of the sample’s reflectance spectra and the energy output of the heat lamp used in the test method Test Method D4803.

1.3 Appendix X1 provides a method for using the intensity factor to determine the maximum temperature rise of a sample under severe solar exposure.

1.3.1 A correlation between intensity factor and heat buildup (temperature rise) as predicted by Test Method D4803 exists.

1.3.2 The heat buildup (temperature rise) for a polymeric building product specimen is determined from its reflectance spectra and the correlation’s regression equation.

1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.

1.6 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.


Keywords

heat build; intensity factor; polymeric siding; siding; spectral reflectance; temperature rise;


ICS Code

ICS Number Code 83.140.99 (Other rubber and plastic products)


DOI: 10.1520/D7990-21



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