ASTM D7540-09

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 to prepare specimens for testing the color and strength of a pigment for routine quality control.

By following the procedure described in Appendix X1, the conditions for achieving the maximum practical degree of dispersion with a mechanical muller may be determined. Any color and strength tests done with the dispersions should be carried out under these conditions.

1.1 This practice is intended to be used to disperse a chromatic pigment for subsequent testing.

1.2 This practice does not apply to white pigments.

Note 1—The dispersion portion of Test Method D 3022 is similar to this practice, but it utilizes a miniature sandmill rather than a mechanical muller, to disperse the chromatic pigment.

Note 2—The dispersion portions of Test Methods D 332 and D 2745 are similar to this practice, but they are intended for use with white pigments, rather than chromatic pigments.

1.3 The values stated in SI units are to be regarded as the standard. 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.