ASTM D7251-2010 5625 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品的颜色和外观保持性的标准规范》.pdf
《ASTM D7251-2010 5625 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品的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 D7251-2010 5625 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products《杂色塑料壁板产品的颜色和外观保持性的标准规范》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7251 10An American National StandardStandard Specification forColor and Appearance Retention of Variegated Color PlasticSiding Products1This standard is issued under the fixed designation D7251; 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. Scope*1.1 This specification establishes requirements and testmethods for the color and a
3、ppearance 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 and appearance for variegatedcolors is complicated by the pr
4、esence of multiple colors in arandom pattern. The procedure is based on using a template toreference six spots for color measurement.1.4 Methods of indicating compliance with this specifica-tion are provided.1.5 This standard does not purport to address all of thesafety concerns, if any, associated
5、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 standard.2. Referenced Documents2.1 ASTM Standards:2D883 Ter
6、minology Relating to PlasticsD1435 Practice for Outdoor Weathering of PlasticsD1600 Terminology for Abbreviated Terms Relating toPlasticsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesE805 Practice for Identification of Instrument
7、al Methods ofColor or Color-Difference Measurement of MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering Tests3. Terminology3.1 DefinitionsDefinitions are in accordance with termi-nologies in Terminologies D883 and D1600 unless otherw
8、isenoted.3.2 Definitions of Terms Specific to This Standard:3.2.1 color regionparameters that define the color spacefor a siding sample. Color is measured with Hunter Units,sphere geometry (di:8), Illuminant C, 2 Observer, specularcomponent included.3.2.1.1 DiscussionThe color values used to classif
9、y colorsby region were 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, by truncatingany fractional result) to be used to classify colors
10、 by region.Thus, average values greater than zero are truncated down tothe next lowest integer, and average values less than zero aretruncated up to the next highest integer. All values greater than-1 and less than +1 truncate to 0.3.2.2 color retention standardspredictive color regionsdescribed by
11、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 that describe the three dimensional ellipsoidvalue.3.2.3 ellipsoid valuea mathematical calcula
12、tion derivedby inserting the measured DL, Da, and Db values of aweathered specimen into an ellipsoid equation.3.2.4 temperate northern climatein weathering testing,aNorth American metropolitan area testing site located within73 to 100W longitude and 37 to 45N latitude.3.2.5 variegated plastic siding
13、siding having discretemarkings of different colors.4. Classification4.1 DefinitionsDefinitions are in accordance with termi-nology in Terminologies D883 and D1600 unless otherwisenoted.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of
14、Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved Jan. 1, 2010. Published February 2010. Originallyapproved in 2006. Last previous edition approved in 2009 as D7251 - 09. DOI:10.1520/D7251-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
15、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
16、cken, PA 19428-2959, United States.4.2 Color RegionsThe color region for a color is deter-mined by measuring the Hunter L, a, b color values at sixlocations on each specimen in a sample population andcalculating the average Hunter L, a, b color value. Use theinteger value (by truncating any fraction
17、al result) of theaverage to determine the color region for the color using thefollowing region boundaries.4.2.1 Region 1BrownL = 20 to 49 L = 25 to 49a=1to5 a=8to5b=2to11 b=12to254.2.2 Region 2Medium BlueL = 45 to 64a = 26 to 1b = 25 to 24.2.3 Region 3Light BlueL = 65 to 93a = 12 to 1b = 25 to 24.2.
18、4 Region 4GreenL = 50 to 84 L = 50 to 64 L = 50 to 64a = 12 to 1 a = 25 to 3 a = 25 to 13b=1to10 b=11to30 b=1to10L = 65 to 93 L = 85 to 93a = 25 to 13 a = 12 to 3b=25to30 b=1to34.2.5 Region 5Medium BeigeL = 50 to 74 L = 50 to 64 L = 65 to 74a=0to1 a=2to1 a=12to1b=4to12 b=11to15 b=11to124.2.6 Region
19、6Light BeigeL = 75 to 84 L = 85 to 93 L = 75 to 84a=0to1 a=12to1 a=12to1b=4to12 b=4to12 b=11to124.2.7 Region 7GoldL = 65 to 93 L = 65 to 93a=0to4 a=5to25b=13to30 b=16to304.2.8 Region 8YellowL = 65 to 93a = 12 to 1b=13to304.2.9 Region 9WhiteL = 85 to 100 All L = 94 to 100a=2to1b=1to34.2.10 Region 10L
20、ight GrayL = 65 to 84a=0to1b=1to34.2.11 Region 11MauveL = 65 to 93 L = 65 to 93 L = 50 to 64 L = 50 to 64a=2to25 a=5to25 a=2to25 a=2to1b=2to12 b=13to15 b=2to30 b=16to304.2.12 Region 12Medium GrayL = 50 to 64a=0to1b=1to34.2.13 Region 13Dark GrayL = 25 to 49a=1to5b=1to14.2.14 Region 14Dark BlueL = 25
21、to 44a = 25 to 3b = 25 to 24.2.15 Region 15Dark GreenL = 25 to 49a = 20 to 2b=1to114.2.16 Region 16Dark RedL = 25 to 49a=6to30b=1to254.2.17 Region 17PurpleL = 25 to 44 L = 45 to 49 L = 50 to 93a=4to30 a=2to30 a=2to25b = 25 to 2 b = 25 to 2 b = 25 to 14.3 Ellipsoid Value EquationsUse the following eq
22、uationsto determine the 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
23、Region 2Medium BlueDL 1 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!21
24、Db 0.4!23.9!25 Ellipsoid 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 ValueD7251 1024.3.9 Region 9
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