ASTM D7856-15
(Specification)Standard Specification for Color and Appearance Retention of Solid and Variegated Color Plastic Siding Products using CIELab Color Space
Standard Specification for Color and Appearance Retention of Solid and Variegated Color Plastic Siding Products using CIELab Color Space
SCOPE
1.1 This specification establishes requirements and test methods for the color and appearance retention of solid and variegated colored plastic siding products.
1.2 Color retention testing provides a method for estimating the acceptability of color change in a siding product over a period of years of service. The exposure locations and durations specified in this standard have been shown to provide a good estimation of the color change in a siding product over a period of years of service (see 2.2).
1.3 This specification is a successor to Specifications D6864 and D7251, which cover solid colors and variegated colors, respectively. This specification combines coverage for both, and has the same scope as those standards.
1.4 Specifications D6864 and D7251 use Hunter Lab color space for measurement of colors and evaluation of color change. These standards require classification of colors into regions based on the L, a, and b coordinates of the color, and evaluation of color changes is done using an ellipsoid value equation having unique coefficients for each color region. This specification uses CIE 1976 L* a* b* color space for measurement and evaluation of color change. Using this method, the need for separate color regions and evaluation equations has been eliminated.
1.5 Provisions for sample selection and preparation, and weathering are the same in this specification as in Specifications D6864 and D7251.
1.6 Characterization of color and appearance for variegated colors is complicated by the presence of multiple colors in a random pattern. The procedure for measuring variegated colors in this specification is based on using a template to reference six spots for color measurement.
1.7 This standard specifies outdoor weathering in three specific climate zones for a single 24-month exposure, and the color retention performance requirements under these conditions are established to predict acceptable performance for the expected service life. However, nothing in this standard precludes the use of different or additional climate zones, or different exposure durations, so long as those conditions are clearly specified in any reports.
1.8 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this standard.
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Designation:D7856 −15
StandardSpecification for
Color and Appearance Retention of Solid and Variegated
1
Color Plastic Siding Products using CIELab Color Space
This standard is issued under the fixed designation D7856; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* color retention performance requirements under these condi-
tions are established to predict acceptable performance for the
1.1 This specification establishes requirements and test
expected service life. However, nothing in this standard pre-
methods for the color and appearance retention of solid and
cludes the use of different or additional climate zones, or
variegated colored plastic siding products.
different exposure durations, so long as those conditions are
1.2 Color retention testing provides a method for estimating
clearly specified in any reports.
the acceptability of color change in a siding product over a
1.8 Units—The values stated in inch-pound units are to be
period of years of service. The exposure locations and dura-
regarded as standard. The values given in parentheses are
tions specified in this standard have been shown to provide a
mathematical conversions to SI units that are provided for
good estimation of the color change in a siding product over a
information only and are not considered standard.
period of years of service (see 2.2).
1.9 This standard does not purport to address all of the
1.3 ThisspecificationisasuccessortoSpecificationsD6864
safety concerns, if any, associated with its use. It is the
and D7251, which cover solid colors and variegated colors,
responsibility of the user of this standard to establish appro-
respectively. This specification combines coverage for both,
priate safety and health practices and determine the applica-
and has the same scope as those standards.
bility of regulatory limitations prior to use.
1.4 Specifications D6864 and D7251 use Hunter Lab color
NOTE 1—There is no known ISO equivalent to this standard.
space for measurement of colors and evaluation of color
change. These standards require classification of colors into
2. Referenced Documents
regions based on the L, a, and b coordinates of the color, and
2
2.1 ASTM Standards:
evaluation of color changes is done using an ellipsoid value
D660 Test Method for Evaluating Degree of Checking of
equation having unique coefficients for each color region. This
Exterior Paints
specification uses CIE 1976 L* a* b* color space for measure-
D661 Test Method for Evaluating Degree of Cracking of
ment and evaluation of color change. Using this method, the
Exterior Paints
need for separate color regions and evaluation equations has
D662 Test Method for Evaluating Degree of Erosion of
been eliminated.
Exterior Paints
1.5 Provisions for sample selection and preparation, and
D714 Test Method for Evaluating Degree of Blistering of
weathering are the same in this specification as in Specifica-
Paints
tions D6864 and D7251.
D772 Test Method for Evaluating Degree of Flaking (Scal-
1.6 Characterization of color and appearance for variegated
ing) of Exterior Paints
colors is complicated by the presence of multiple colors in a
D883 Terminology Relating to Plastics
randompattern.Theprocedureformeasuringvariegatedcolors
D1435 Practice for Outdoor Weathering of Plastics
in this specification is based on using a template to reference
D1600 Terminology forAbbreviatedTerms Relating to Plas-
six spots for color measurement.
tics
D2244 Practice for Calculation of Color Tolerances and
1.7 This standard specifies outdoor weathering in three
Color Differences from Instrumentally Measured Color
specific climate zones for a single 24-month exposure, and the
Coordinates
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.24 on Plastic Building
2
Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2015. Published April 2015. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2014. Last previous edition approved in 2014 as D7856 – 14. Standards volume information, refer to the standard’s Document Summary page on
DOI:10.1520/D7856-15. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7856−15
D4214 Test Methods for Evaluating the Degree of Chalking 4.3.3 Specimens shall be a flat
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7856 − 14 D7856 − 15
Standard Specification for
Color and Appearance Retention of Solid and Variegated
1
Color Plastic Siding Products using CIELab Color Space
This standard is issued under the fixed designation D7856; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This specification establishes requirements and test methods for the color and appearance retention of solid and variegated
colored plastic siding products.
1.2 Color retention testing provides a method for estimating the acceptability of color change in a siding product over a period
of years of service. The exposure locations and durations specified in this standard have been shown to provide a good estimation
of the color change in a siding product over a period of years of service (see 2.2).
1.3 This specification is a successor to Specifications D6864 and D7251, which cover solid colors and variegated colors,
respectively. This specification combines coverage for both, and has the same scope as those standards.
1.4 Specifications D6864 and D7251 use Hunter Lab color space for measurement of colors and evaluation of color change.
These standards require classification of colors into regions based on the L, a, and b coordinates of the color, and evaluation of
color changes is done using an ellipsoid value equation having unique coefficients for each color region. This specification uses
CIE 1976 L* a* b* color space for measurement and evaluation of color change. Using this method, the need for separate color
regions and evaluation equations has been eliminated.
1.5 Provisions for sample selection and preparation, and weathering are the same in this specification as in Specifications D6864
and D7251.
1.6 Characterization of color and appearance for variegated colors is complicated by the presence of multiple colors in a random
pattern. The procedure for measuring variegated colors in this specification is based on using a template to reference six spots for
color measurement.
1.7 This standard specifies outdoor weathering in three specific climate zones for a single 24-month exposure, and the color
retention performance requirements under these conditions are established to predict acceptable performance for the expected
service life. However, nothing in this standard precludes the use of different or additional climate zones, or different exposure
durations, so long as those conditions are clearly specified in any reports.
1.8 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered standard.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D660 Test Method for Evaluating Degree of Checking of Exterior Paints
D661 Test Method for Evaluating Degree of Cracking of Exterior Paints
D662 Test Method for Evaluating Degree of Erosion of Exterior Paints
D714 Test Method for Evaluating Degree of Blistering of Paints
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.24 on Plastic Building Products.
Current edition approved Feb. 1, 2014April 1, 2015. Published February 2014April 2015. DOI: 10.1520/D7856-14.Originally approved in 2014. Last previous edition
approved in 2014 as D7856 – 14. DOI:10.1520/D7856-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7856 − 15
D772 Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints
D883 Term
...
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