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Standard Practice for Performing Accelerated Outdoor Weathering of Materials Using Concentrated Natural Sunlight
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Available format(s): PDF
Superseded date: 04-09-2023
Language(s): English
Published date: 01-01-2018
Publisher: American Society for Testing and Materials
CONTAINED IN VOL. 14.04, 2017 Defines a procedure for performing accelerated outdoor exposure testing of nonmetallic materials using a Fresnel-reflector accelerated outdoor weathering test machine.
1.1Fresnel-reflecting concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of materials.
1.2This practice covers a procedure for performing accelerated outdoor exposure testing of materials using a Fresnel-reflector accelerated outdoor weathering test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described herein to minimize the variables encountered during outdoor accelerated exposure testing.
1.3This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method of obtaining, measuring, and controlling the procedures and certain conditions of the exposure. Sample preparation, test conditions, and evaluation of results are covered in existing methods or specifications for specific materials.
1.4The Fresnel-reflector accelerated outdoor exposure test machines described may be suitable for the determination of the relative durability of materials exposed to sunlight, heat, and moisture, provided the mechanisms of chemical or physical change, or both, which control the acceleration factors for the materials do not differ significantly.
1.5This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are standard provisions for maintenance of the machine and Fresnel-reflector mirrors to ensure cleanliness and durability.
1.6This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.
1.7For test machines currently in use, this practice may not apply to specimens exceeding 13 mm (1/2in.) in thickness because cooling may be questionable.
1.8Values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are provided for information only.
1.9This 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.
1.10This 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.
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