ASTM D5326-94a(2013)
Standard Test Method for Color Development in Tinted Latex Paints

Standard No.

ASTM D5326-94a(2013)

Release Date

1994

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D5326-22

Latest

ASTM D5326-22

Scope

5.1 A colorant sometimes fails to disperse completely in a base paint due to poor compatibility, which can be the fault of the colorant, the paint, or both. This will result in poor color development, which is readily manifested by the common procedure of applying the paint with a doctor blade and subjecting the drawdown to high shear stress by finger-rubbing a small area of the partially dry film. This tends to disperse undeveloped colorant, if any, and produces a color variation between the unsheared and sheared areas of the paint film. The variation can be measured colorimetrically to give a numerical color difference value that is a measure of the color development of the original paint, the smaller the difference the better the color development and vice versa. Color difference values obtained by finger-rubbing were found to vary widely for the same as well as among different operators. This test method establishes a controlled shear-stress procedure analogous to the finger rub-up test, but with far better reproducibility.

5.2 Poor color development can be a problem in the production of paints, and in their performance in the field. In production it causes a loss of colorant monetary value, and unpredictable tinting results. In field performance it results in color variations in the applied paint film due to the varying shear forces to which the paint is subjected at different stages or by different modes of application.

5.3 Although poor color development is primarily and most often related to the colorant portion of a tinted paint, the white pigment in the base paint can also be poorly developed due to flocculation or other causes. In the latter case, shear dispersion can make the paint film lighter and less colorful, rather than the reverse. Then too, the colorant and the white might both be poorly developed, and the color change due to shear stress would then be the combined effect of both.

5.4 In any case, color development is an important paint property, for the measurement of which this test method is intended to provide a generally accepted and reproducible test method.

1.1 This test method covers a procedure for measuring color development in tinted latex paints, for the purpose of determining the efficiency of colorants, the tintability of base paints and the potential for poor color uniformity of applied paint films.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 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.

ASTM D5326-94a(2013) Referenced Document

• ASTM D16 Standard Terminology for Paint, Related Coatings, Materials, and Applications
• ASTM D2244 Standard Test Method for Calculation of Color Differences From Instrumentally Measured Color Coordinates
• ASTM D3924 Standard Specification for Standard Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials
• ASTM D3925 Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
• ASTM E1164 Standard Practice for Obtaining Spectrophotometric Data for Object-Color Evaluation
• ASTM E1331 Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry*， 1996-04-20 Update
• ASTM E1345 Standard Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements*， 2019-05-01 Update
• ASTM E1347 Standard Test Method for Color and Color-Difference Measurement by Tristimulus (Filter) Colorimetry*， 1997-04-20 Update
• ASTM E1349 Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional Geometry
• ASTM E284 Standard Terminology of Appearance*， 1999-04-20 Update

ASTM D5326-94a(2013) history

• 2022 ASTM D5326-22 Standard Test Method for Color Development in Tinted Latex Paints
• 1994 ASTM D5326-94a(2013) Standard Test Method for Color Development in Tinted Latex Paints
• 2009 ASTM D5326-94a(2009) Standard Test Method for Color Development in Tinted Latex Paints
• 1994 ASTM D5326-94a(2002) Standard Test Method for Color Development in Tinted Latex Paints
• 1994 ASTM D5326-94a Standard Test Method for Color Development in Tinted Latex Paints