ASTM G141 - 09(2013)

    Standard Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials

    Active Standard ASTM G141 | Developed by Subcommittee: G03.93

    Book of Standards Volume: 14.04

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    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.

    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.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D4853 Guide for Reducing Test Variability

    D6631 Guide for Committee D01 for Conducting an Interlaboratory Study for the Purpose of Determining the Precision of a Test Method

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials

    G24 Practice for Conducting Exposures to Daylight Filtered Through Glass

    G90 Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight

    G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials

    G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests

    G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

    G152 Practice for Operating Open Flame Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials

    G153 Practice for Operating Enclosed Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials

    G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials

    G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials

    G166 Guide for Statistical Analysis of Service Life Data

    G169 Guide for Application of Basic Statistical Methods to Weathering Tests

    G172 Guide for Statistical Analysis of Accelerated Service Life Data

    G183 Practice for Field Use of Pyranometers, Pyrheliometers and UV Radiometers

    ICS Code

    ICS Number Code 19.020 (Test conditions and procedures in general)

    UNSPSC Code

    UNSPSC Code

    DOI: 10.1520/G0141

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