ASTM D5145-03

Standard Test Methods for Nonvolatile and Pigment Content of Electrocoat Baths

SIGNIFICANCE AND USE
The nonvolatile content and pigment content are measures of total solids and inorganic pigment solids, respectively, in electrocoat paints. In addition to production quality control, these properties are important in maintaining electrocoat baths in the optimum range.
Other test methods for determining nonvolatile content of paint and paint related materials are described in Guide D 2832.
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 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: 09-Jan-2003
• 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

• Replaces: ASTM D5145-90(1997) - Standard Test Methods for Nonvolatile and Pigment Content of Electrocoat Baths
• Effective Date: 10-Jan-2003
• Replaced By: ASTM D5145-09 - Standard Test Methods for Nonvolatile and Pigment Content of Electrocoat Baths
• Effective Date: 01-Feb-2009
• Referred By: ASTM D1978-91(2018) - Standard Guide for Analysis of Electrocoat Bath Samples
• Effective Date: 10-Jan-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D5145–03
Standard Test Methods for
1
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 4.2 Other test methods for determining nonvolatile content
of paint and paint related materials are described in Guide
1.1 These test methods cover the characterization of elec-
D 2832.
trocoat baths through the determination of nonvolatile content
of inorganic pigment content.
5. Apparatus
1.2 This standard does not purport to address all of the
5.1 Analytical Balance with a sensitivity of 0.1 mg.
safety concerns, if any, associated with its use. It is the
5.2 Aluminum Weighing Dishes, 57 mm in diameter and 17
responsibility of the user of this standard to establish appro-
mm deep. These commercial dishes may contain a lubricant
priate safety and health practices and determine the applica-
used during their manufacture. This should be removed by
bility of regulatory limitations prior to use.
heating the aluminum dishes on a hot plate at 300°C until
2. Referenced Documents vapors are no longer visible. Store the dishes in a desiccator
until needed.
2.1 ASTM Standards:
2
5.3 Syringes, 5-mL, disposable variety.
D 1193 Specification for Reagent Water
5.4 Oven circulating, maintained at 110 6 2°C.
D 2832 Guide for Determining Volatile and Nonvolatile
3
5.5 Muffle Furnace, maintained at 500 6 15°C.
Content of Paint and Related Coatings
E 180 Practice for Determining the Precision of ASTM
6. Reagents
Methods for Analysis and Testing of Industrial Chemicals
4 6.1 Purity of Water—References to water shall be under-
and Specialty Chemicals
stood to mean water conforming to Type II of Specification
3. Summary of Test Method D 1193.
3.1 Two specimens are accurately weighed into aluminum
7. Sampling and Sample Preparation
weighing dishes. The dishes are placed in an oven at 110°C for
7.1 Obtain the sample while the electrocoat bath is under
1 h, reweighed to obtain the nonvolatile matter content and, if
proper circulation so a uniform sample is obtained. In the case
required, placed in a muffle furnace at 500°C for2hand
of a ultrafiltrate sample, the material should be thoroughly
weighed a third time to obtain the inorganic pigment content.
mixed or stirred prior to drawing the sample, thereby ensuring
4. Significance and Use uniformity.
7.2 Aftersampling,priortoremovingthetestspecimen,itis
4.1 The nonvolatile content and pigment content are mea-
mandatory the sample be shaken or stirred until it is homoge-
sures of total solids and inorganic pigment solids, respectively,
neous and free of any settled material. This is particularly
in electrocoat paints. In addition to production quality control,
important if there is a delay between sampling the bath and
these properties are important in maintaining electrocoat baths
performing this test procedure. The absence of settled material
in the optimum range.
should be ascertained visually or by inserting a spatula and
scraping the bottom of the container. Continue to shake or stir
the sample until specimens are taken for measurement. This
1
These test methods are under the jurisdiction of ASTM Committee D01 on
Point is Very Important.
Paint and Related Coating, Materials, and Applications and are the direct respon-
sibility of Subcommittee D01.21 on Chemical Analysis of Paints and Paint
Materials. NONVOLATILE CONTENT
Current edition approved Jan. 10, 2003. Published March 2003. Originally
approved in 1990. Last previous edition approved in 1997 as D 5145 - 90 (1997).
8. Procedure
2
Annual Book of ASTM Standards, Vol 11.01.
3
8.1 Weigh two aluminum dishes separately, each to 0.1 mg
Annual Book of ASTM Standards, Vol 06.01.
4
Annual Book of ASTM Standards, Vol 15.05. and record as W .
1
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D5145–03
8.2 Using a syringe, withdraw 1.0 to 1.5 of the well mixed INORGANIC PIGMENT CONTENT
sample, then quickly weigh the syringe to 0.1 mg, recording
11. Procedure
this weight as W . Transfer the entire contents of the syringe
2
11.1 Place the weighing dishes used for the nonvolatile
into the aluminum dish. Reweigh the empty syringe to 0.1 mg
content determination in the muffle furnace at 500°C for 2 h.
and record as W . In the case of ultrafiltrate clear liquids or of
3
11.2 After 2 h, remove the dishes from the muffle furnace,
low solids paints, increase the specimen size to 5 mL and
transfer the
...