ASTM_D_6864_-_11.pdf

Designation:D686411An American National StandardStandard Specification forColor and Appearance Retention of Solid Colored PlasticSiding Products1This standard is issued under the fixed designation D6864;the number immediately following the designation indicates the year oforiginal adoption or,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 specification establishes requirements and testmethods for the color and appearance retention of solid coloredplastic 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 Methods of indicating compliance with this specifica-tion are provided.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1435 Practice for Outdoor Weathering of PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD3679 Specification for Rigid Poly(Vinyl Chloride)(PVC)SidingE805 Practice for Identification of Instrumental Methods ofColor or Color-Difference Measurement of MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering Tests2.2 Other Reference:Vinyl Siding Institute(VSI)Technical Research Report forWeatherability of Vinyl Siding Products,VS2WNOTE2This report supports the conclusion that commercial vinylsiding products which demonstrate weathering behavior within confor-mance to these standards during a two year test program can be anticipatedto provide acceptable color retention properties for the expected life of theproduct.3.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nologies D883 and D1600 unless otherwise noted.3.2 Definitions of Terms Specific to This Standard:3.2.1 color regionparameters that define the color spacefor a siding sample,measured with Hunter Units,spheregeometry(di:8),Illuminant C,2 observer,specular componentincluded.3.2.1.1 DiscussionThe color values used to classify 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 by region.Thus average values greater than zero are truncated down to thenext 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 a three dimensional model,which constitutesacceptable 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 calculation 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 within 73 to100W longitude and 37 to 45N latitude.4.Classification4.1 DefinitionsDefinitions are in accordance with Termi-nologies D883 and D1600 unless otherwise noted.4.2 Color RegionsThe color region for a color is deter-mined by measuring the Hunter L,a,b color values for asample.Use the integer value(by truncating any fractional1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 2003.Last previous addition approved in 2010 as D6864-10.DOI:10.1520/D6864-11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 result)to determine the color region for the color using thefollowing region boundaries.4.2.1 Region 1Brown:L=20 to 49L=25 to 49a=1 to 5a=8 to 5b=2 to 11b=12 to 254.2.2 Region 2Medium Blue:L=45 to 64a=25 to 1b=25 to 24.2.3 Region 3Light Blue:L=65 to 93a=12 to 1b=25 to 24.2.4 Region 4Green:L=50 to 84L=50 to 64L=50 to 64L=65 to 93L=85 to 93a=12 to 1a=25 to 3a=25 to13a=25 to13a=12 to 3b=1 to 10b=11 to 30b=1 to 10b=25 to 30b=1 to 34.2.5 Region 5Medium Beige:L=50 to 74L=50 to 64L=65 to 74a=0 to 1a=2 to 1a=12 to 1b=4 to 12b=11 to 15b=11 to 124.2.6 Region 6Light Beige:L=75 to 84L=85 to 93L=75