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Standard Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials
Automaticky přeložený název:
Standardní Průvodce pro adresování Variabilita Testování expozice z nekovových materiálů
NORMA vydána dne 1.11.2013
Označení normy: ASTM G141-09(2013)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.11.2013
Kód zboží: NS-57388
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
accelerated testing, climate, experimental design, nonmetallic materials, statistics, sunlight, testing variability, ultraviolet, weathering, ICS Number Code 19.020 (Test conditions and procedures in general)
Significance and Use | ||||||||||||||||||||||||||||||||||||
4.1 Many standards and specifications reference exposure tests performed according to standards that are the responsibility of Committee G03 on Durability of Nonmetallic Materials. In many cases, use of the data generated in these tests fails to consider the ramifications of variability in the exposure test practices. This variability can have a profound effect on the interpretation of results from the exposure tests, and if not taken into consideration in test design and data analysis, can lead to erroneous or misleading conclusions. This guide lists some of the sources for test variability and recommends strategies for executing successful weathering studies. Not all sources of variability in weathering testing are addressed in this guide. Specific materials, sampling procedures, specimen preparation, specimen conditioning, and material property measurements can contribute significantly to variability in weathering test results. Many of these concerns are addressed in Guide G147. To reduce the contribution of an instrumental method to test variability, it is essential to follow appropriate calibration procedures and ASTM standards associated with the particular property measurement. Additional sources of variability in test results are listed in Guide D4853, along with methods for identifying probable causes. |
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1. Scope | ||||||||||||||||||||||||||||||||||||
1.1 This guide covers information on sources of variability and strategies for its reduction in exposure testing, and for taking variability into consideration in the design, execution, and data analysis of both exterior and laboratory accelerated exposure tests. 1.2 The values stated in SI units are to be regarded separately as the standard. The inch-pound values given in parentheses are for information only. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||||||
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