ASTM-D7251 Standard Specification for Color and Appearance Retention of Variegated Color Plastic Siding Products

ASTM-D7251 - 2009 EDITION - SUPERSEDED
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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.

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 6 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.

Keywords

Color and appearance; Color retention; Retention characteristics/testing; Solid colored plastic siding products; ICS Number Code 01.070 (Colour coding); 83.080.01 (Plastics in general)

To find similar documents by ASTM Volume:

08.03 (Plastics (III): D5117 - latest; Reinforced Plastic Piping Systems and Chemical Equipment; Plastic Building Products)

To find similar documents by classification:

01.070 (Colour coding Standards included in this group shall also be included in other groups and/or sub-groups according to their subject)

83.080.01 (Plastics in general)

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Document Number

ASTM-D7251-09

Revision Level

2009 EDITION

Status

Superseded

Modification Type

Revision

Publication Date

Dec. 1, 2009

Document Type

Specification

Page Count

7 pages

Committee Number

D20.24