ASTM D7251 - 11

    Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products

    Active Standard ASTM D7251 | Developed by Subcommittee: D20.24

    Book of Standards Volume: 08.03


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    ASTM D7251

    Abstract

    This specification establishes requirements and test methods for the color and appearance retention of variegated color plastic siding products. Color retention testing provides a method for estimating the acceptability of color change in a siding product over a period of years of service. Characterization of color and appearance for variegated colors is complicated by the presence of multiple colors in a random pattern. The procedure is based on using a template to reference 6 spots for color measurement. The color region for a color is determined by measuring the Hunter L, a, b color values for a sample population and calculating the average Hunter L, a, b color value. Ellipsoid Value Equations are used to determine the ellipsoid value representing the change in color due to weathering. Samples shall be exposed at three test sites: Temperate Northern represented by a site located in Louisville, KY or Cleveland, OH; hot, humid represented by a site located in Miami, FL, and hot, dry represented by a site located in Phoenix, Arizona. Materials shall be tested and the individual grades shall conform to specified values of ellipsoid value, color retention, and variegation change.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification establishes requirements and test methods for the color and appearance retention of variegated color 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.

    1.3 Characterization of color and appearance for variegated colors is complicated by the presence of multiple colors in a random pattern. The procedure is based on using a template to reference six spots for color measurement.

    1.4 Methods of indicating compliance with this specification are provided.

    1.5 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D883 Terminology Relating to Plastics

    D1435 Practice for Outdoor Weathering of Plastics

    D1600 Terminology for Abbreviated Terms Relating to Plastics

    D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

    E805 Practice for Identification of Instrumental Methods of Color or Color-Difference Measurement of Materials

    G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests


    ICS Code

    ICS Number Code 01.070 (Colour coding); 83.080.01 (Plastics in general)

    UNSPSC Code

    UNSPSC Code 13100000(Rubber and elastomers); 30151802(Siding)


    DOI: 10.1520/D7251-11

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