ASTM D4674-2002a(2010) Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments《暴露在室内荧光灯和透窗入室日光下的塑料颜色稳定性加速试验的标准试验方法》.pdf
《ASTM D4674-2002a(2010) Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments《暴露在室内荧光灯和透窗入室日光下的塑料颜色稳定性加速试验的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4674-2002a(2010) Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments《暴露在室内荧光灯和透窗入室日光下的塑料颜色稳定性加速试验的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4674 02a (Reapproved 2010)Standard Practice forAccelerated Testing for Color Stability of Plastics Exposedto Indoor Office Environments1This standard is issued under the fixed designation D4674; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the year 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.1. Scope1.1 This practice covers the basic principles and operatingprocedures for using fluo
3、rescent light to determine colorstability of plastics when materials are exposed in typical officeenvironments where fluorescent overhead lighting andwindow-filtered daylight are used for illumination and wheretemperature and humidity conditions are in accordance withAmerican Society of Heating, Ref
4、rigerating, and Air-conditioning Engineers (ASHRAE) recommendations forworkers comfort.1.2 This practice describes four methods where specimensare exposed to fluorescent light under controlled environmentalconditions. Two of the methods use an exposure device thatprovides for mixing of fluorescent l
5、amps and two of themethods use devices that comply with Practice G154.NOTE 1Method I uses cool white fluorescent lamps and window glassfiltered fluorescent UVB lamps and is the same method described inprevious versions of this standard.1.3 Specimen preparation and evaluation of the results arecovere
6、d in ASTM methods or specifications for specificmaterials. General guidance is given in Practice G151. Morespecific information about methods for determining the changein properties after exposure and reporting these results isdescribed in Practice D5870.1.4 The values stated in SI units are to be r
7、egarded as thestandard.1.5 Unless otherwise specified, all dimensions are nominal.1.6 This practice may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, is any, associated with itsuse. It is the responsibility of the user o
8、f this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 7.NOTE 2There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D172
9、9 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD3980 Practice for Interlaboratory Testing of Paint andRelated Materials3D5870
10、Practice for Calculating Property Retention Index ofPlasticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG113 Terminology Relating to Natural andArtificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure T
11、estingof Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices that Use Laboratory Light SourcesG154 Practice for Operating Fluorescent Light
12、Apparatusfor UV Exposure of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3. Terminology3.1 DefinitionsThe definitions given in TerminologyG113 are applicable to this practice.4. Summary of Practice4.1 This practice provides for the exposure of specim
13、ens tofluorescent light under controlled environmental conditions.Radiant energy is provided by one of the following fluorescentlight sources: (1) VHO cool-white fluorescent lamps and glassfiltered fluorescent UV lamps, (2) VHO cool-white fluorescent1This practice is under the jurisdiction ofASTM Co
14、mmittee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved Oct. 1, 2010. Published March 2011. Originallyapproved in 1987. Last previous edition approved in 2002 as D4674 - 02a. DOI:10.1520/D4674-02AR10.2For referenced ASTM stand
15、ards, 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.3Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
16、hohocken, PA 19428-2959, United States.lamps alone, (3) standard output cool white fluorescent lampsalone, or (4) UVA-351 fluorescent UVA lamps.4.1.1 Method I is intended to simulate the conditions in anoffice environment plus a portion of solar UV radiationtransmitted by window glass. Methods II an
17、d III are intendedto simulate only the indoor lighting component of a typicaloffice environment. Method IV is intended to simulate only theeffects of a portion of solar UV radiation transmitted throughwindow glass.NOTE 3A comparison of the four listed methods has not beenperformed, and as such, resu
18、lts obtained from each method cannot beconsidered as equivalent.NOTE 4For more information on the use of fluorescent UV lamps tosimulate solar UV radiation behind window glass, refer to Annex A1 ofPractice G154.4.1.2 Do not compare Comparison of results obtained fromspecimens exposed using the metho
19、ds described should not bemade unless correlation has been established between themethods being compared for the materials being tested.4.2 Color change is determined periodically throughout thecourse of the exposure by comparison of the exposed speci-mens to unexposed specimens, using either visual
20、 or instru-mental procedures.5. Significance and Use5.1 Tests conducted in accordance with this practice areintended to induce property changes associated with useexposure to light and heat in typical office environments. Theseexposures are not intended to simulate the deterioration causedby localiz
21、ed phenomena such as handling, dirt contamination,etc.NOTE 5Caution: Caution: Refer to practice G151 for full cautionaryguidance applicable to all laboratory weathering devices. Additionalinformation on sources of variability and on strategies for addressingvariability by design and data analysis of
22、 laboratory accelerated exposuretests is found in Guide G141.5.2 Variation in results may be expected are possible be-tween the different methods described in this practice. Forexample, differences in spectral distribution of the lamps usedand variations in the irradiance for a single type of lamp c
23、ancause significant differences in test results. Therefore, any noreference to the use of this practice should be made unlessaccompanied by a report prepared in accordance with Section12 that describes needs to include a reference to the methodused.5.3 Reproducibility of test results between laborat
24、ories hasbeen shown to be good when the stability of materials isevaluated in terms of performance ranking compared to othermaterials or to a control. Therefore, exposure of a similarmaterial of known performance (a control) at the same time asthe test materials is strongly recommended. It is recomm
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