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    ASTM E1348 - 15e1

    Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry

    Active Standard ASTM E1348 | Developed by Subcommittee: E12.02

    Book of Standards Volume: 06.01

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    Significance and Use

    5.1 The most direct and accessible methods for obtaining the color coordinates of object colors are by instrumental measurement using spectrophotometers or colorimeters with either hemispherical or bidirectional optical measuring systems. This test method provides procedures for such measurement by transmittance spectrophotometry using a hemispherical optical measuring system.

    5.2 This test method is especially suitable for measurement of the following types of specimens (see also Guide E179 and Practice E805):

    5.2.1 Fully transparent specimens (free from turbidity, haze, or translucency), and

    5.2.2 Translucent or hazy specimens, provided that the specimen can be placed flush against the transmission port of the integrating sphere.

    5.3 This test method is not recommended for measurement of retroreflective transparent or translucent specimens, or samples that are fluorescent.

    1. Scope

    1.1 This test method describes the instrumental measurement of the transmission properties and color of object-color specimens by the use of a spectrophotometer or spectrocolorimeter with a hemispherical optical measuring system, such as an integrating sphere.

    1.2 This test method is generally suitable for all fully transparent specimens without regard for the specimen position relative to the transmission port of the instrument. Translucent specimens, however, must be placed flush against the transmission port of the sphere.

    1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.4 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.

    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

    D1003 Test Method for Haze and Luminous Transmittance of Transparent Plastics

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

    E179 Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials

    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

    ICS Code

    ICS Number Code 17.180.20 (Colours and measurement of light)

    Referencing This Standard
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    DOI: 10.1520/E1348-15E01

    Citation Format

    ASTM E1348-15e1, Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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