1.1 This test method describes the instrumental measurement of the reflection 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 The test method is suitable for use with most objectcolor specimens. However, it should not be used for retroreflective specimens or for fluorescent specimens when highest accuracy is desired. Specimens having intermediate-gloss surfaces should preferably not be measured by use of this geometry.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
ASTM E1331-15(2019) Referenced Document
ASTM D2244 Standard Test Method for Calculation of Color Differences From Instrumentally Measured Color Coordinates
ASTM E1164 Standard Practice for Obtaining Spectrophotometric Data for Object-Color Evaluation
ASTM E1345 Standard Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements
ASTM E179 Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials