Meaning and Purpose
4.1 The conductivity of the electrophoresis bath is due to the presence of ionic substances in the electrophoresis tank, from the carrier, and the presence of impurities in the form of ionizable acids, bases, salts, or combinations of these substances. The existence of excessive ionic impurities is not conducive to the application and performance of electrophoretic paint. The test is suitable for research, production, quality control and electrophoretic bath process control.

4.2 Other relevant methods for the determination of water conductivity are described in test method D1125.

ASTM D 4399-90-2017 “Measuring the Conductivity of Electrophoretic Paints”

Scope of
1.1 The test method consists of measuring the conductivity of an electrophoresis cell or ultrafiltrate sample using commercially available equipment.

1.2 Values expressed in SI units should be considered standard values. Other units of measurement are not included in this standard.

1.3 This standard is not intended to address all safety issues, if any, associated with its use. It is the responsibility of users of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

1.4 This international Standard has been developed in accordance with the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.