ASTM D3723-05

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 500C. 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.
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: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaces: ASTM D3723-84(1999) - Standard Test Method for Pigment Content of Water-Emulsion Paints by Low-Temperature Ashing
• Effective Date: 01-Jan-2005
• Replaced By: ASTM D3723-05e1 - Standard Test Method for Pigment Content of Water-Emulsion Paints by Low-Temperature Ashing
• Effective Date: 01-Jan-2005
• Referred By: ASTM C1315-19 - Standard Specification for Liquid Membrane-Forming Compounds Having Special Properties for Curing and Sealing Concrete
• Effective Date: 01-Jan-2005
• Referred By: ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
• Effective Date: 01-Jan-2005
• Referred By: ASTM D2205-20 - Standard Guide for Selection of Tests for Traffic Paints
• Effective Date: 01-Jan-2005
• Referred By: ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
• Effective Date: 01-Jan-2005
• Referred By: ASTM D4451-22 - Standard Test Method for Pigment Content of Paints by Low-Temperature Ashing
• Effective Date: 01-Jan-2005

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:D3723–05
Standard Test Method for
Pigment Content of Water-Emulsion Paints by Low-
1
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.
4.4 Aluminum Foil Dish, 58 mm in diameter by 18 mm high
1.1 This test method covers a procedure for the pigment
with a flat bottom. The bottom of the dish should be as nearly
content determination of water-based paints. It is applicable
flat as possible so that a uniform film is produced.
only to pigments that do not decompose or lose weight at
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
3
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 the
5.2 Purity of Water—Unless otherwise indicated, references
standard. The values given in parentheses are for information
to water shall be understood to mean reagent water conforming
only.
to Type III of Specification D1193.
1.4 This standard does not purport to address all of the
4
5.3 Ammonium Hydroxide —Add 1 volume of concen-
safety concerns, if any, associated with its use. It is the
trated NH OH (sp gr 0.90) to 3 volumes of water.
4
responsibility of the user of this standard to establish appro-
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-
chanical shaker. If air bubbles become entrapped in a sample,
2. Referenced Documents
2 stir it by hand.
2.1 ASTM Standards:
6.2 Draw approximately 1.5 g of the test paint into a 5-mL
D1193 Specification for Reagent Water
syringe and weigh to 1 mg. Add the paint dropwise (about 30
3. Significance and Use drops) into a tared-aluminum foil dish that contains 2 mL of
water (5.2). Swirl the dish during the addition and continue the
3.1 This test method is used by paint producers and con-
swirling until the specimen is completely dispersed. Reweigh
sumers for product process control and for product acceptance.
the syringe to 1 mg. Transfer between 0.4 and 0.6 g of sample
4. Apparatus to the dish. If not, adjust the transferred volume and prepare a
new specimen. If the specimen agglomerates or forms a lump
4.1 Oven, forced draft, maintained at 105 6 2°C.
that cannot be dispersed, a drop or two of ammonia (5.3) may
4.2 Furnace, muffle, maintained at 450 6 25°C.
facilitate the dispersement. If the lumping persists, discard the
specimen and prepare a new one. Prepare a duplicate specimen
in the same manner.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
3
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved Jan. 1, 2005. Published February 2005. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
approved in 1978. Last previous edition approved in 1999 as D3723 – 84 (1999). listed by the American Chemical Society, see Analar Standards for Laboratory
DOI: 10.1520/D3723-05. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
2
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 [e-mail]. For Annual Book of ASTM MD.
4
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. Manufact
...