ASTM C609-20
Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile

Standard No.

ASTM C609-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM C609-23

Latest

ASTM C609-23

Scope

1.1 This test method covers the measurement of Light Reflectance Value (LRV) and visually small color difference between pieces of glazed or unglazed ceramic tile, using any spectrophotometer that meets the requirements specified in the test method. LRV and the magnitude and direction of the color difference are expressed numerically, with sufficient accuracy for use in product specification. 1.2 LRV may be measured for either solid-colored tile or tile having a multicolored, speckled, or textured surface. For tile that are not solid-colored, an average reading should be obtained from multiple measurements taken in a pattern representative of the overall sample as described in 9.2 of this test method. Small color difference between tiles should only be measured for solid-color tiles. Small color difference between tile that have a multicolored, speckled, or textured surface are not valid. 1.3 For solid colored tile, a comparison of the test specimen and reference specimen should be made under incandescent, fluorescent and daylight illuminant conditions. The use of multiple illuminants allows the color difference measurement to be made without the risk of wrongly accepting a match when the tiles being compared are metamers (see 3.1.4). 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 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 C609-20 Referenced Document

• ASTM C242 Standard Terminology of Ceramic Whitewares and Related Products*， 2021-10-01 Update
• ASTM D2244 Standard Test Method for Calculation of Color Differences From Instrumentally Measured Color Coordinates
• ASTM E259 Standard Practice for Preparation of Pressed Powder White Reflectance Factor Transfer Standards for Hemispherical and Bi-Directional Geometries
• ASTM E284 Standard Terminology of Appearance

ASTM C609-20 history

• 2023 ASTM C609-23 Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile
• 2020 ASTM C609-20 Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile
• 2019 ASTM C609-07(2019) Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile
• 2007 ASTM C609-07(2014) Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile
• 2007 ASTM C609-07 Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile
• 1990 ASTM C609-90(2000) Standard Test Method for Measurement of Small Color Differences Between Ceramic Wall or Floor Tile
• 2000 ASTM C609-90(1995) Standard Test Method for Measurement of Small Color Differences Between Ceramic Wall or Floor Tile