ASTM D4399-90(1999)

Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths

SCOPE
1.1 This test method covers the determination of the electrical conductivity of electrocoat baths or ultrafiltrate samples using commercially available equipment.  
1.2 This standard does not purport to address the safety problems 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.

General Information

• Status: Historical
• Publication Date: 09-May-1999
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaced By: ASTM D4399-05 - Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths
• Effective Date: 01-Jan-2005
• Referred By: ASTM D1978-91(2018) - Standard Guide for Analysis of Electrocoat Bath Samples
• Effective Date: 10-May-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4399–90(Reapproved 1999)
Standard Test Method for
Measuring Electrical Conductivity of Electrocoat Baths
This standard is issued under the fixed designation D4399; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the elec- 5.1 Conductivity Bridge—Battery, orAC/DC line-operated,
trical conductivity of electrocoat baths or ultrafiltrate samples capable of providing a conductivity reading almost instanta-
using commercially available equipment. neously.
1.2 This standard does not purport to address all of the 5.2 Conductivity Cell—Dip or fill type, cell constant of 1.0.
safety concerns, if any, associated with its use. It is the 5.3 Thermometer—Any type capable of 0.5°C accuracy
responsibility of the user of this standard to establish appro- with a−2 to 32°C range.
priate safety and health practices and determine the applica- 5.4 Measuring Vessel—Any suitable cylindrical container
bility of regulatory limitations prior to use. capable of holding sufficient electrocoat sample to cover the
electrodesoftheconductivitycell,andallowingatleast25mm
2. Referenced Documents
between the conductivity cell and the sides of the vessel.
2.1 ASTM Standards:
6. Reagents and Materials
D1125 Test Methods for Electrical Conductivity and Re-
sistivity of Water 6.1 Purity of Water—References to water shall be under-
D1193 Specification for Reagent Water stood to mean water conforming to Type II of Specification
D1193.
3. Summary of Test Method
6.2 Cleaning Solvent—An appropriate solvent for the elec-
3.1 A specimen is placed in a conductivity cell, or con-
trocoat material under measurement.
versely a conductivity cell is placed in an electrocoat material,
7. Sampling and Sample Preparation
and the cell is connected to a conductivity bridge. The
electrical conductivity is read directly off the meter of the 7.1 The sample should be obtained while the electrocoat
bridge as the instantaneous peak reading. bath is under proper circulation so that a uniform sample is
obtained. In the case of an ultrafiltrate, the material should be
4. Significance and Use
thoroughly mixed or stirred prior to sampling to ensure
4.1 The conductivity of electrocoat baths results from the uniformity.
presence of ionic species in the bath, which come from the
7.2 After sampling and prior to removing a test specimen, it
vehicle and from the presence of impurities present as ioniz- ismandatorythatthesamplesbeshakenorstirreduntiltheyare
able acids, bases, salts, or combinations of these.The presence
homogeneous and free of any settled material. This is particu-
of excessive amounts of ionic impurities is detrimental to the larly important if there is a delay between sampling the bath
application and performance properties of electrocoating
and performing the test on the bath materials. The absence of
paints. The test is suitable for use in research, production, settled material can be ascertained visually (in a transparent
quality control and electrocoat bath process control.
container) or by inserting a spatula, scraping the bottom of the
4.2 Other related methods for determining the electrical containerandmakingsurethatthereisnosettledmatter.Shake
conductivity of water are described in Test Methods D1125.
or stir the sample until specimens are taken for measurement;
THIS POINT IS VERY IMPORTANT.
8. Procedure
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
8.1 Calibratetheconductivitycellpriortousefollowingthe
Subcommittee D01.21
...