ASTM D3723-05(2011)
(Test Method)Standard Test Method for Pigment Content of Water-Emulsion Paints by Low-Temperature Ashing
Standard Test Method for Pigment Content of Water-Emulsion Paints by Low-Temperature Ashing
SIGNIFICANCE AND USE
This test method is used by paint producers and consumers for product process control and for product acceptance.
SCOPE
1.1 This test method covers a procedure for the pigment content determination of water-based paints. It is applicable only to pigments that do not decompose or lose weight at temperatures below 500°C. Such pigments include most metal oxides, silicates, and a majority of anhydrous inorganic salts.
1.2 Many water-based paints contain pigments and organic colorants that lose water of hydration or decompose at this temperature. The residual ash should be carefully inspected for changes in color or texture that could indicate a pigment alteration and hence lead to erroneous results. Caution should therefore be exercised when applying this test method to samples containing unknown pigment compositions.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D3723 − 05 (Reapproved 2011)
Standard Test Method for
Pigment Content of Water-Emulsion Paints by Low-
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Temperature Ashing
This standard is issued under the fixed designation D3723; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Syringe, 5-mL.
1.1 This test method covers a procedure for the pigment 4.4 Aluminum Foil Dish, 58 mm in diameter by 18 mm high
content determination of water-based paints. It is applicable
with a flat bottom. The bottom of the dish should be as nearly
only to pigments that do not decompose or lose weight at flat as possible so that a uniform film is produced.
temperatures below 500°C. Such pigments include most metal
5. Reagents
oxides, silicates, and a majority of anhydrous inorganic salts.
5.1 Purity of Reagents—Reagent grade chemicals shall be
1.2 Many water-based paints contain pigments and organic
used in all tests. Unless otherwise indicated, it is intended that
colorants that lose water of hydration or decompose at this
all reagents shall conform to the specifications of the Commit-
temperature. The residual ash should be carefully inspected for
tee onAnalytical Reagents of theAmerican Chemical Society,
changes in color or texture that could indicate a pigment
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where such specifications are available. Other grades may be
alteration and hence lead to erroneous results. Caution should
used, provided it is first ascertained that the reagent is of
therefore be exercised when applying this test method to
sufficiently high purity to permit its use without lessening the
samples containing unknown pigment compositions.
accuracy of the determination.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water conforming
standard.
to Type III of Specification D1193.
1.4 This standard does not purport to address all of the
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safety concerns, if any, associated with its use. It is the
5.3 Ammonium Hydroxide —Add 1 volume of concen-
responsibility of the user of this standard to establish appro- trated NH OH (sp gr 0.90) to 3 volumes of water.
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priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 Mix samples until homogeneous, preferably on a me-
2. Referenced Documents
chanical shaker. If air bubbles become entrapped in a sample,
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2.1 ASTM Standards:
stir it by hand.
D1193 Specification for Reagent Water
6.2 Draw approximately 1.5 g of the test paint into a 5-mL
3. Significance and Use
syringe and weigh to 1 mg. Add the paint dropwise (about 30
drops) into a preweighed, tared aluminum dish that contains 2
3.1 This test method is used by paint producers and con-
sumers for product process control and for product acceptance. mL of water (5.2). Swirl the dish during the addition and
continue the swirling until the specimen is completely dis-
4. Apparatus
persed. Reweigh the syringe to 1 mg.Transfer between 0.4 and
4.1 Oven, forced draft, maintained at 105 6 2°C.
0.6gofsampletothedish.Ifnot,adjustthetransferredvolume
and prepare a new specimen. If the specimen agglomerates or
4.2 Furnace, muffle, maintained at 450 6 25°C.
forms a lump that cannot be dispersed, a drop or two of
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
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Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved June 1, 2011. Published June 2011. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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approved in 1978. Last previous edition approved in 2005 as D3723 – 05 . DOI: listed by the American Chemical Society, see Analar Standards for Laboratory
10.1520/D3723-05R11. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM MD.
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Standards volume information, refer to the standard’s Document Summary page on For guidance in the safe handling of ammonium hydroxide consult the
the ASTM website. Manufacturing Chemists Association’s Chemical Safety Data Sheet.
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