ASTM D305-84(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D305 − 84 (Reapproved 2020)
Standard Test Method for
Solvent-Extractable Material in Black Pigments
This standard is issued under the fixed designation D305; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 4.2 Extraction Thimbles—The thimble must be made of
greaseless paper and be of correct size to fill the selected
1.1 This test method covers the determination of the
apparatus.
solvent-extractable material in black pigments such as carbon
black, lampblack, and bone black.
NOTE 2—The recommended thimble size for each of the apparatus
shown in Fig. 1 is listed below:
1.2 The values stated in SI units are to be regarded as the
Fig. 1 Fig. 2
standard. The values given in parentheses are for information
Height 70 mm 62 mm
only.
Inside diameter 28 mm 22 mm
Outside diameter 30 mm 24 mm
1.3 This standard does not purport to address all of the
4.3 The thimbles are available in various heights and widths
safety concerns, if any, associated with its use. It is the
with two thickness levels, single thickness or double thickness.
responsibility of the user of this standard to establish appro-
Single-thickness thimbles are recommended for this extraction
priate safety, health, and environmental practices and deter-
procedure.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
5. Reagents and Material
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.1 Purity of Reagents—Reagent grade chemicals shall be
Development of International Standards, Guides and Recom-
used in all tests. Unless otherwise indicated, it is intended that
mendations issued by the World Trade Organization Technical
all reagents shall conform to the specifications of the Commit-
Barriers to Trade (TBT) Committee.
tee onAnalytical Reagents of theAmerican Chemical Society,
where such specifications are available. Other grades may be
2. Referenced Documents
used, provided it is first ascertained that the reagent is of
2.1 ASTM Standards:
sufficiently high purity to permit its use without lessening the
D329 Specification for Acetone accuracy of the determination.
5.2 Solvent—Acetone and benzene are the most commonly
3. Significance and Use
used solvents (see Specification D329); however, other sol-
3.1 Thistestmethodisusedbyblackpigmentproducersand
vents may be used as agreed upon.
users for product acceptance.
5.3 Glass Wool.
4. Apparatus
6. Procedure
4.1 Extraction Apparatus, consisting of a flask, siphon cup,
6.1 Weight approximately 10 g of pigment (moisture-free)
and a condenser similar to the apparatus shown in either Fig. 1
into a weighed thimble and record the weight to 0.1 g. For
or Fig. 2.
pigments with high apparent density (bone black, iron oxides,
NOTE 1—A Sophlet apparatus may be used as an alternative.
etc.) a 40-g sample is recommended. Plug the open end of the
thimble with glass wool and place in the siphon cup. Add 200
This test method is under the jurisdiction of ASTM Committee D01 on Paint
to 250 mL of the solvent to the previously dried flask.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.31 on Pigment Sp
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