ASTM G90-2010 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight《使用集中自然光对非金属材料进行加速室外候化的标准实施规程》.pdf
《ASTM G90-2010 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight《使用集中自然光对非金属材料进行加速室外候化的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM G90-2010 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight《使用集中自然光对非金属材料进行加速室外候化的标准实施规程》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G90 10Standard Practice forPerforming Accelerated Outdoor Weathering of NonmetallicMaterials Using Concentrated Natural Sunlight1This standard is issued under the fixed designation G90; the number immediately following the designation indicates the year of originaladoption or, in the ca
2、se of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 Fresnel-reflecting concentrators using the sun as sourceare utilized in the accelerated ou
3、tdoor exposure testing ofnonmetallic materials.1.2 This practice covers a procedure for performing accel-erated outdoor exposure testing of nonmetallic materials usinga Fresnel-reflector accelerated outdoor weathering test ma-chine. The apparatus (see Fig. 1 and Fig. 2) and guidelines aredescribed h
4、erein to minimize the variables encountered duringoutdoor accelerated exposure testing.1.3 This practice does not specify the exposure conditionsbest suited for the materials to be tested but is limited to themethod of obtaining, measuring, and controlling the proce-dures and certain conditions of t
5、he exposure. Sample prepara-tion, test conditions, and evaluation of results are covered inexisting methods or specifications for specific materials.1.4 The Fresnel-reflector accelerated outdoor exposure testmachines described may be suitable for the determination ofthe relative durability of materi
6、als exposed to sunlight, heat,and moisture, provided the mechanisms of chemical or physi-cal change, or both, which control the rates of accelerationfactors for the materials do not differ significantly.1.5 This practice establishes uniform sample mounting andin-test maintenance procedures. Also inc
7、luded in the practiceare standard provisions for maintenance of the machine andFresnel-reflector mirrors to ensure cleanliness and durability.1.6 This practice shall apply to specimens whose size meetsthe dimensions of the target board as described in 8.2.1.7 For test machines currently in use, this
8、 practice may notapply to specimens exceeding 13 mm (12 in.) in thicknessbecause cooling may be questionable.1.8 Values stated in SI units are to be regarded as thestandard. The inch-pound units in parentheses are provided forinformation only.1.9 This standard does not purport to address all of thes
9、afety 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 use.2. Referenced Documents2.1 ASTM Standards:2D859 Test Method for Silica i
10、n WaterD1014 Practice for Conducting Exterior Exposure Tests ofPaints and Coatings on Metal SubstratesD1435 Practice for Outdoor Weathering of PlasticsD1898 Practice for Sampling of Plastics3D4141 Practice for Conducting Black Box and Solar Con-centrating Exposures of CoatingsD4517 Test Method for L
11、ow-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectros-copyE816 Test Method for Calibration of Pyrheliometers byComparison to Reference PyrheliometersE824 Test Method for Transfer of Calibration From Refer-ence to Field RadiometersE903 Test Method for Solar Absorptance, R
12、eflectance, andTransmittance of Materials Using Integrating Spheres3G7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG113 Terminology Relating to Natural andArtificial Weath-ering Tests of Nonme
13、tallic MaterialsG167 Test Method for Calibration of a Pyranometer Usinga PyrheliometerG169 Guide for Application of Basic Statistical Methods toWeathering TestsG173 Tables for Reference Solar Spectral Irradiances: Di-rect Normal and Hemispherical on 37 Tilted Surface1This practice is under the juris
14、diction of ASTM Committee G03 on Weatheringand Durability and is the direct responsibility of Subcommittee G03.02 on Naturaland Environmental Exposure Tests.Current edition approved June 1, 2010. Published June 2010. Originallyapproved in 1985. Last previous edition approved in 2005 as G90 05. DOI:1
15、0.1520/G0090-10.2For 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.3Withdrawn. The last approved version of this
16、 historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.2 Other Standards:SAE J576 Plastic Materials for Use in Optical Parts Such asLenses and Reflectors of Motor Vehicle Lighting Devices4
17、WMO Guide to Meteorological Instruments and Methods ofObservation WMO No. 8, Fifth Edition53. Terminology3.1 DefinitionsDefinitions of terms common to G03 du-rability standards can be found in Terminology G113.4. Significance and Use4.1 Results obtained from this practice can be used tocompare the r
18、elative durability of materials subjected to thespecific test cycle used. No accelerated exposure test can bespecified as a total simulation of natural or field exposures.Results obtained from this practice can be considered asrepresentative of natural or field exposures only when thedegree of compa
19、rative performance has been established forthe specific materials being tested.4.2 The relative durability of materials in natural or fieldexposure can be very different depending on the location of theexposure because of differences in UV radiation, time ofwetness, temperature, pollutants, and othe
20、r factors. Therefore,even if results from a specific accelerated test condition arefound to be useful for comparing the relative durability ofmaterials exposed in a particular exterior location, it cannot beassumed that they will be useful for determining relativedurability for a different location.
21、4.3 The use of a single acceleration factor relating the rateof degradation in this accelerated exposure to the rate ofdegradation in a conventional exterior exposure is not recom-mended because the acceleration factor varies with the typeand formulation of the material. Each material and formulatio
22、nmay respond differently to the increased level of irradiance anddifferences in temperature and humidity. Thus an accelerationfactor determined for one material may not be applicable toother materials. Because of variability in test results under bothaccelerated and conventional exterior exposures r
23、esults from a4Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,PA 15096-0001, http:/www.sae.org.5Available from World Meteorological Organization, Geneva, Switzerland.FIG. 1 Schematic of Fresnel-Reflecting Concentrator Accelerated Weathering Machine Single Axis TrackingG90102
24、sufficient number of tests must be obtained to determine anacceleration factor for a material. Further, the accelerationfactor is applicable to only one exterior exposure locationbecause results from conventional exterior exposures can varydue to seasonal or annual differences in important climaticf
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