ASTM D5145-90(1997)

Standard Test Methods for Nonvolatile and Pigment Content of Electrocoat Baths

SCOPE
1.1 These test methods cover the characterization of electrocoat baths through the determination of nonvolatile content of inorganic pigment content.
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-Jun-1997
• ICS: 87.040 - Paints and varnishes
• 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 D5145-03 - Standard Test Methods for Nonvolatile and Pigment Content of Electrocoat Baths
• Effective Date: 10-Jan-2003
• Referred By: ASTM D1978-91(2018) - Standard Guide for Analysis of Electrocoat Bath Samples
• Effective Date: 10-Jun-1997

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5145 – 90 (Reapproved 1997)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Methods for
Nonvolatile and Pigment Content of Electrocoat Baths
This standard is issued under the fixed designation D 5145; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5.2 Aluminum Weighing Dishes, 57 mm in diameter and 17
mm deep. These commercial dishes may contain a lubricant
1.1 These test methods cover the characterization of elec-
used during their manufacture. This should be removed by
trocoat baths through the determination of nonvolatile content
heating the aluminum dishes on a hot plate at 300°C until
of inorganic pigment content.
vapors are no longer visible. Store the dishes in a desiccator
1.2 This standard does not purport to address all of the
until needed.
safety concerns, if any, associated with its use. It is the
5.3 Syringes, 5-mL, disposable variety.
responsibility of the user of this standard to establish appro-
5.4 Oven circulating, maintained at 110 6 2°C.
priate safety and health practices and determine the applica-
5.5 Muffle Furnace, maintained at 500 6 15°C.
bility of regulatory limitations prior to use.
6. Reagents
2. Referenced Documents
6.1 Purity of Water—References to water shall be under-
2.1 ASTM Standards:
2 stood to mean water conforming to Type II of Specification
D 1193 Specifications for Reagent Grade Water
D 1193.
D 2832 Guide for Determining Volatile and Nonvolatile
Content of Paint and Related Coatings
7. Sampling and Sample Preparation
E 180 Practice for Determining the Precision Data of
7.1 Obtain the sample while the electrocoat bath is under
ASTM Methods for Analysis and Testing of Industrial
4 proper circulation so a uniform sample is obtained. In the case
Chemicals
of a ultrafiltrate sample, the material should be thoroughly
3. Summary of Test Method mixed or stirred prior to drawing the sample, thereby ensuring
uniformity.
3.1 Two specimens are accurately weighed into aluminum
7.2 After sampling, prior to removing the test specimen, it is
weighing dishes. The dishes are placed in an oven at 110°C for
mandatory the sample be shaken or stirred until it is homoge-
1 h, reweighed to obtain the nonvolatile matter content and, if
neous and free of any settled material. This is particularly
required, placed in a muffle furnace at 500°C for2hand
important if there is a delay between sampling the bath and
weighed a third time to obtain the inorganic pigment content.
performing this test procedure. The absence of settled material
4. Significance and Use
should be ascertained visually or by inserting a spatula and
scraping the bottom of the container. Continue to shake or stir
4.1 The nonvolatile content and pigment content are mea-
the sample until specimens are taken for measurement. This
sures of total solids and inorganic pigment solids, respectively,
Point is Very Important.
in electrocoat paints. In addition to production quality control,
these properties are important in maintaining electrocoat baths
NONVOLATILE CONTENT
in the optimum range.
4.2 Other test methods for determining nonvolatile content
8. Procedure
of paint and paint related materials are described in Method
8.1 Weigh two aluminum dishes separately, each to 0.1 mg
D 2832.
and record as W .
8.2 Using a syringe, withdraw 1.0 to 1.5 of the well mixed
5. Apparatus
sample, then quickly weigh the syringe to 0.1 mg, recording
5.1 Analytical Balance with a sensitivity of 0.1 mg.
this weight as W . Transfer the entire contents of the syringe
into the aluminum dish. Reweigh the empty syringe to 0.1 mg
These test methods are under the jurisdiction of ASTM Committee D-1 on Paint and record as W . In the case of ultrafiltrate clear liquids or of
and Related Coating, Materials, and Applications and are the direct responsibility of
low solids paints, increase the specimen size to 5 mL and
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
preheat at 60°C for 2 h. Duplicate this step with the second
Current edition approved Dec. 13, 1990. Published January 1991.
aluminum dish (8.1).
Annual Book of ASTM Standards, Vol 11.01.
Annual Book of ASTM Standards, Vol 06.01.
8.3 Add a few millilitres of water to the specimen in the
Annual Book of ASTM Standards, Vol 15.05.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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