1、Designation:G14109(Reapproved 2013)Standard Guide forAddressing Variability in Exposure Testing of NonmetallicMaterials1This standard is issued under the fixed designation G141;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONNo experimental procedure is exactly repeatable or reproducible.Exposure testing is susceptible topoor test reproducib
3、ility because of many contributing factors.These include the type of material andits homogeneity,the complexity and variability of the outdoor environment,difficulty in preciselycontrolling the laboratory testing environment,and the variability in the measurement of performance.It is extremely diffi
4、cult to compare“absolute data,”that is,color shift,gloss,tensile,and elongation,and so forth,from different exposure tests.This is true for natural and accelerated exposures conductedoutdoors or for accelerated exposure tests conducted at different times in one laboratory or comparingresults between
5、 laboratories.The purpose of this guide is to provide the user with backgroundinformation on test variability and guidance to conduct an exposure test that will provide valid anduseful durability information.1.Scope*1.1 This guide covers information on sources of variabilityand strategies for its re
6、duction in exposure testing,and fortaking variability into consideration in the design,execution,and data analysis of both exterior and laboratory acceleratedexposure tests.1.2 The values stated in SI units are to be regarded sepa-rately as the standard.The inch-pound values given in paren-theses ar
7、e for information only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to
8、 use.2.Referenced Documents2.1 ASTM Standards:2D4853 Guide for Reducing Test Variability(Withdrawn2008)3D6631 Guide for Committee D01 for Conducting an Inter-laboratory Study for the Purpose of Determining thePrecision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test
9、 MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG90 Practice for Performing Accelerated O
10、utdoor Weather-ing of Nonmetallic Materials Using Concentrated NaturalSunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice f
11、or Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG152 Practice for Operating Open Flame Carbon Arc LightApparatus for Exposure of Nonmetallic MaterialsG153 Practice for Operating Enclosed Carbon Arc LightApparatus for Exposure of Nonmetallic Materials1Th
12、is guide is under the jurisdiction of ASTM Committee G03 on Weatheringand Durabilityand is the direct responsibility of Subcommittee G03.93 on Statistics.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 1996.Last previous edition approved in 2009 as G141 09.DOI:10.15
13、20/G0141-09R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical stand
14、ard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 G154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmet
15、allic MaterialsG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic MaterialsG166 Guide for Statistical Analysis of Service Life DataG169 Guide for Application of Basic Statistical Methods toWeathering TestsG172 Guide for Statistical Analysis of Accelerated ServiceLife D
16、ataG183 Practice for Field Use of Pyranometers,Pyrheliom-eters and UV Radiometers3.Terminology3.1 Definitions:3.1.1 Terminology G113 is generally applicable to thisguide.4.Significance and Use4.1 Many standards and specifications reference exposuretests performed according to standards that are the responsi-bility of Committee G03 on Durability of Nonmetallic Mate-rials.In many cases,use of the data generated in these testsfails to consider the ramifications of variability in the exposuretest pr