ASTM E2539 - 14(2017)

    Standard Test Method for Multiangle Color Measurement of Interference Pigments

    Active Standard ASTM E2539 | Developed by Subcommittee: E12.12

    Book of Standards Volume: 06.01

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    Significance and Use

    5.1 This test method is designed to provide color data obtained from spectral reflectance factors at specific illumination and detection angles for interference pigments. Information presented in this test method is based upon data taken on materials exclusively pigmented with interference pigments.

    5.2 These data can be used for acceptance testing, design purposes, research, manufacturing control, and quality control.

    5.3 Specimens must be statistically representative of the end use.

    5.4 Applicability of this test method for other materials, including combining interference pigments with absorbing and scattering pigments should be confirmed by the user.

    1. Scope

    1.1 This test method covers the instrumental requirements and required parameters needed to make instrumental color measurements of thin film interference pigments. This test method is designed to encompass interference pigments used in architectural applications, automobiles, coatings, cosmetics, inks, packaging, paints, plastics, printing, security, and other applications.

    1.2 Characterization of the optical behavior of materials colored with interference pigments requires measurement at multiple angles of illumination and detection.

    1.3 Data taken utilizing this test method are quantitative and are appropriate for quality control of interference pigment color.

    1.4 The measurement results are usually expressed as reflectance factors, tristimulus color values, or as CIE L*a*b* color coordinates and color difference.

    1.5 The totality of data taken may not be necessary for evaluating mixtures also containing non-interference pigments. The committee is investigating and evaluating the appropriateness of this test method for those materials. It is the responsibility of the users to determine the applicability of this test method for their specific applications.

    1.6 Interference pigments are typically evaluated for color and color appearance in a medium, such as paint or ink. The gonioapparent effect depends strongly on the physical and chemical properties of the medium. Some of the properties affecting color and color appearance include vehicle viscosity, thickness, transparency, and volume solids. As a general rule, for quality control purposes, interference pigments are best evaluated in a masstone product form. In some cases this product form may be the final product form, or more typically a qualified simulation of the intended product form (such as a paint drawdown) that in terms of color and appearance correlates to final product application.

    1.7 This standard does not address the requirements for characterizing materials containing metal flake pigments. Measurements of the optical characteristics of materials containing metal flake pigments are described in Test Method E2194.

    1.8 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    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.

    1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    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

    E284 Terminology of Appearance

    E308 Practice for Computing the Colors of Objects by Using the CIE System

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

    E1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation

    E1345 Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements

    E1708 Practice for Electronic Interchange of Color and Appearance Data

    E1767 Practice for Specifying the Geometries of Observation and Measurement to Characterize the Appearance of Materials

    E2194 Test Method for Multiangle Color Measurement of Metal Flake Pigmented Materials

    E2480 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method with Multi-Valued Measurands

    ISCC Publications

    Technical Report 2003–1

    ICS Code

    ICS Number Code 17.180.20 (Colours and measurement of light); 87.060.10 (Pigments and extenders)

    UNSPSC Code

    UNSPSC Code 12171600(Pigments)

    Referencing This Standard
    Link Here
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    DOI: 10.1520/E2539-14R17

    Citation Format

    ASTM E2539-14(2017), Standard Test Method for Multiangle Color Measurement of Interference Pigments, ASTM International, West Conshohocken, PA, 2017,

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