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Significance and Use
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.
Fully transparent specimens (free from turbidity, haze, or translucency), and
Translucent or hazy specimens, provided that the specimen can be placed flush against the transmission port of the integrating sphere.
This test method is not recommended for measurement of retroreflective transparent or translucent specimens, or samples that are fluorescent.
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.
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 Number Code 17.180.20 (Colours and measurement of light)
UNSPSC Code 41115406(Spectrophotometers)
ASTM E1348-11, Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry, ASTM International, West Conshohocken, PA, 2011, www.astm.orgBack to Top