ASTM D7251-2006e1 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品颜色和外观保持性的标准规范》.pdf
《ASTM D7251-2006e1 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品颜色和外观保持性的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7251-2006e1 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品颜色和外观保持性的标准规范》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7251 06e1An American National StandardStandard Specification forColor and Appearance Retention of Variegated Color PlasticSiding Products1This standard is issued under the fixed designation D 7251; the number immediately following the designation indicates the year oforiginal adoption
2、 or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEFig. 1 was editorially revised in September 2006.1. Scope1.1 This specification e
3、stablishes requirements and testmethods for the color and appearance retention of variegatedcolor plastic siding products.1.2 Color retention testing provides a method for estimatingthe acceptability of color change in a siding product over aperiod of years of service.1.3 Characterization of color a
4、nd appearance for variegatedcolors is complicated by the presence of multiple colors in arandom pattern. The procedure is based on using a template toreference 6 spots for color measurement.1.4 Methods of indicating compliance with this specifica-tion are provided.1.5 This standard does not purport
5、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 use.NOTE 1There is no known ISO equivalent to this sta
6、ndard.2. Referenced Documents2.1 ASTM Standards:2D 883 Terminology Relating to PlasticsD 1435 Practice for Outdoor Weathering of PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured C
7、olorCoordinatesE 805 Practice for Identification of Instrumental Methods ofColor or Color-Difference Measurement of MaterialsG 147 Practice for Conditioning and Handling of Nonme-tallic Materials for Natural and Artificial Weathering Tests3. Terminology3.1 DefinitionsDefinitions are in accordance wi
8、th termi-nologies in Terminologies D 883 and D 1600 unless otherwisenoted.3.2 Definitions of Terms Specific to This Standard:3.2.1 color regionparameters that define the color spacefor a siding measured with Hunter Units, Illuminant C, 2Observer, specular component included.3.2.1.1 DiscussionThe col
9、or values used to classify colorsby region will be established by measuring the Hunter L, a, bcolor values from the sample population, calculating theaverage for Hunter L, a, b, and then choosing the integer fromthe corresponding L, a, b average values (that is, no roundingup or down) to be used to
10、classify colors by region.3.2.2 color retention standardspredictive color regionsdescribed by a three dimensional model which constituteacceptable color retention levels resulting from weathering ofa specific product type and color.3.2.2.1 DiscussionColor retention standards are definedby equations
11、that describe the three dimensional ellipsoidvalue.3.2.3 ellipsoid valuea mathematical calculation derivedby inserting the measured DL, Da, and Db values of aweathered specimen into an ellipsoid equation.3.2.4 variegated plastic sidingsiding having discretemarkings of different colors.4. Classificat
12、ion4.1 DefinitionsDefinitions are in accordance with termi-nology in Terminologies D 883 and D 1600 unless otherwisenoted.4.2 Color RegionsThe color region for a color is deter-mined by measuring the Hunter L, a, b color values for asample population and calculating the average Hunter L, a, bcolor v
13、alue. Use the integer value (by truncating any fractionalresult) of the average to determine the color region for the colorusing the following region boundaries.4.2.1 Region 1BrownL = 20 to 491This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibil
14、ity of Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved April 1, 2006. Published April 2006.2For 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
15、the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.a=1to5b=2to114.2.2 Region 2Medium BlueL = 45 to 64a=8to1b = 12 to 24.2.3 Region 3Light BlueL = 65 to 89a=8to1b = 12 to 24.2.4 Regi
16、on 4GreenL = 50 to 84a = 12 to 1b=1to104.2.5 Region 5Medium BeigeL = 50 to 74 L = 50 to 64 L = 65 to 74a=0to1 a=2to1 a=7to0b=4to12 b=11to14 b=11to124.2.6 Region 6Light BeigeL = 75 to 84 L = 85 to 93 L = 75 to 84a=0to1 a=7to1 a=7to1b=4to12 b=4to12 b=11to124.2.7 Region 7GoldL = 65 to 93a=0to4b=13to304
17、.2.8 Region 8YellowL = 65 to 93a = 10 to 1b=13to304.2.9 Region 9WhiteL = 85 to 100 All L = 94 to 100a=2to1b=1to34.2.10 Region 10Light GrayL = 65 to 84a=0to1b=1to34.2.11 Region 11MauveL = 65 to 93 L = 65 to 93 L = 50 to 64a=2to11 a=5to11 a=2to11b=2to12 b=13to15 b=2to154.2.12 Region 12Medium GrayL = 5
18、0 to 64a=0to1b=1to34.2.13 Region 13Dark GrayL = 25 to 49a=1to5b=1to14.2.14 Region 14Dark BlueL = 25 to 44a=8to3b = 12 to 24.2.15 Region 15Dark GreenL = 25 to 49a = 20 to 2b=1to114.2.16 Region 16Dark RedL = 25 to 49a=6to30b=1to254.3 Ellipsoid Value EquationsUse the following equationsto determine the
19、 ellipsoid value representing the change incolor due to weathering. Use the equation that corresponds tothe color region determined for the specimens initial color(prior to weathering) in 4.2.4.3.1 Region 1BrownDL 1.6!25.2!21Da 1 1.0!23.0!21Db 0.5!22.5!25 Ellipsoid Value4.3.2 Region 2Medium BlueDL 1
20、 1.0!26.0!21Da 1 0.6!22.9!21Db 0.8!25.4!25 Ellipsoid Value4.3.3 Region 3Light BlueDL 1 0.3!26.4!21Da 1 0.1!22.7!21Db 0.8!24.3!25 Ellipsoid Value4.3.4 Region 4GreenDL 0.2!25.9!21Da 0.8!24.8!21Db 0.2!25.6!25 Ellipsoid Value4.3.5 Region 5Medium BeigeDL 1 0.1!26.1!21Da 0.0!22.8!21Db 0.4!23.9!25 Ellipsoi
21、d Value4.3.6 Region 6Light BeigeDL 0.0!25.0!21Da 0.2!22.6!21Db 0.3!25.4!25 Ellipsoid Value4.3.7 Region 7GoldDL 1 0.6!26.6!21Da 1 0.3!23.4!21Db 1 0.4!24.7!25 Ellipsoid Value4.3.8 Region 8YellowDL 1 0.3!25.5!21Da 1.0!23.3!21Db 1 0.1!25.5!25 Ellipsoid Value4.3.9 Region 9WhiteDL 0.6!28.2!21Da 1 0.0!23.3
22、!21Db 1.9!25.3!25 Ellipsoid Value4.3.10 Region 10Light GrayDL 1 1.8!27.0!21Da 0.2!22.1!21Db 1.3!24.0!25 Ellipsoid Value4.3.11 Region 11MauveDL 0.4!26.5!21Da 0.8!24.0!21Db 1.1!24.5!25 Ellipsoid Value4.3.12 Region 12Medium GrayDL 1 1.0!26.6!21Da 1 0.3!22.5!21Db 1.2!23.7!25 Ellipsoid Value4.3.13 Region
23、 13Dark GrayDL 0.1!25.1!21Da 1 0.8!23.4!21Db 1 0.1!23.0!25 Ellipsoid ValueD725106e124.3.14 Region 14Dark BlueDL 0.3!25.2!21Da 1.0!23.6!21Db 1 1.3!24.5!25 Ellipsoid Value4.3.15 Region 15Dark GreenDL 0.0!25.0!21Da 1 0.4!23.0!21Db 1 0.2!23.8!25 Ellipsoid Value4.3.16 Region 16Dark RedDL 0.4!25.4!21Da 0.
24、8!24.0!21Db 0.2!23.0!25 Ellipsoid Value5. Procedure for Measuring Color Retention5.1 Test Site Setup and Exposure Duration Test Times:5.1.1 Samples shall be exposed at three test sites: TemperateNorthern represented by a site located in Louisville, KY orCleveland, OH; hot, humid represented by a sit
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