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Significance and Use
Color and tinting strength are the most important properties of a color pigment. This test method provides a means of testing these properties for quality control.
This test method is intended as a referee method so that such matters as the vehicle for preparing the dispersions and the white for making tints have been suggested. However, other vehicles and whites may be suitable for quality control purposes, and changes in this test method are allowed by agreement between the parties to a test.
It is assumed that the most exact comparison of mass color and tinting strength occurs when the pigment is completely dispersed. By following the procedure described in Annex A1, the conditions for achieving the maximum practical degree of dispersion with a mechanical muller may be determined. Color and strength tests should be carried out under these conditions.
The results obtained with a mechanical muller do not necessarily correlate directly with an industrial situation where different dispersing conditions exist. However, dispersion with a mechanical muller is a quick and inexpensive way of testing the color and strength of a pigment for routine quality control.
1.1 This test method is intended to be used to compare the color and strength of a pigment under test with a reference standard of the same type and grade.
1.2 This test method does not apply to white pigments.
Note 1—Test Method D 3022
Note 2—Test Method D 332
1.3 The values stated in SI units are the preferred unit of measurement. The values given in parentheses are for information only.
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. Specific hazard statements are given in Section 8.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D332 Test Method for Relative Tinting Strength of White Pigments by Visual Observation
D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
D2745 Test Method for Relative Tinting Strength of White Pigments by Reflectance Measurements
D3022 Test Method for Color and Strength of Color Pigments by Use of a Miniature Sandmill
D3964 Practice for Selection of Coating Specimens for Appearance Measurements
D4838 Test Method for Determining the Relative Tinting Strength of Chromatic Paints
E284 Terminology of Appearance
ICS Number Code 87.060.10 (Pigments and extenders)
UNSPSC Code 31211503(Pigment paints)