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ASTM D4399-05

(Test Method)

Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths

Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths

SIGNIFICANCE AND USE
The conductivity of electrocoat baths results from the presence of ionic species in the bath, which come from the vehicle and from the presence of impurities present as ionizable acids, bases, salts, or combinations of these. The presence of excessive amounts of ionic impurities is detrimental to the application and performance properties of electrocoating paints. The test is suitable for use in research, production, quality control and electrocoat bath process control.
Other related methods for determining the electrical conductivity of water are described in Test Methods D 1125.
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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.

General Information

Status
Historical
Publication Date
31-Dec-2004
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
Current Stage
Ref Project

Relations

Replaces
ASTM D4399-90(1999) - Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths
Effective Date
01-Jan-2005
Replaced By
ASTM D4399-05e1 - 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
01-Jan-2005

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ASTM D4399-05 - Standard Test Method for Measuring Electrical Conductivity of Electrocoat Baths
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4399–05
Standard Test Method for
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Other related methods for determining the electrical
conductivity of water are described in Test Methods D1125.
1.1 This test method covers the determination of the elec-
trical conductivity of electrocoat baths or ultrafiltrate samples
5. Apparatus
using commercially available equipment.
5.1 Conductivity Bridge—Battery, orAC/DC line-operated,
1.2 The values stated in SI units are to be regarded as the
capable of providing a conductivity reading almost instanta-
standard. The values given in parentheses are for information
neously.
only.
5.2 Conductivity Cell—Dip or fill type, cell constant of 1.0.
1.3 This standard does not purport to address all of the
5.3 Thermometer—Any type capable of 0.5°C accuracy
safety concerns, if any, associated with its use. It is the
with a−2 to 32°C range.
responsibility of the user of this standard to establish appro-
5.4 Measuring Vessel—Any suitable cylindrical container
priate safety and health practices and determine the applica-
capable of holding sufficient electrocoat sample to cover the
bility of regulatory limitations prior to use.
electrodesoftheconductivitycell,andallowingatleast25mm
2. Referenced Documents between the conductivity cell and the sides of the vessel.
2
2.1 ASTM Standards:
6. Reagents and Materials
D1125 Test Methods for Electrical Conductivity and Resis-
6.1 Purity of Water—References to water shall be under-
tivity of Water
stood to mean water conforming to Type II of Specification
D1193 Specification for Reagent Water
D1193.
3. Summary of Test Method 6.2 Cleaning Solvent—An appropriate solvent for the elec-
trocoat material under measurement.
3.1 A specimen is placed in a conductivity cell, or con-
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
7.1 The sample should be obtained while the electrocoat
electrical conductivity is read directly off the meter of the
bath is under proper circulation so that a uniform sample is
bridge as the instantaneous peak reading.
obtained. In the case of an ultrafiltrate, the material should be
4. Significance and Use thoroughly mixed or stirred prior to sampling to ensure
uniformity.
4.1 The conductivity of electrocoat baths results from the
7.2 Aftersamplingandpriortoremovingatestspecimen,it
presence of ionic species in the bath, which come from the
ismandatorythatthesamplesbeshakenorstirreduntiltheyare
vehicle and from the presence of impurities present as ioniz-
homogeneous and free of any settled material. This is particu-
able acids, bases, salts, or combinations of these.The presence
larly important if there is a delay between sampling the bath
of excessive amounts of ionic impurities is detrimental to the
and performing the test on the bath materials. The absence of
application and performance properties of electrocoating
settled material can be ascertained visually (in a transparent
paints. The test is suitable for use in research, production,
container) or by inserting a spatula, scraping the bottom of the
quality control and electrocoat bath process control.
containerandmakingsurethatthereisnosettledmatter.Shake
or stir the sample until specimens are taken for measurement;
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
THIS POINT IS VERY IMPORTANT.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
8. Procedure
Current edition approved Jan. 1, 2005. Published February 2005. Originally
approved in 1984. Last previous edition approved in 1999 as D4399–90(1999).
8.1 Calibratetheconductivitycellpriortousefollowingthe
DOI: 10.1520/D4399-05.
manufacturer’s instructions.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
8.2 Rinse the measuring container several times with por-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tions of the electrocoat material under test.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D4399–05
8.3 Take a representative portion of the electrocoat bath
...

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