ASTM D305-84(2008)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D305 − 84(Reapproved 2008)
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 Department of Defense.
NOTE 2—The recommended thimble size for each of the apparatus
1. Scope
shown in Fig. 1 is listed below:
1.1 This test method covers the determination of the
Fig. 1 Fig. 2
solvent-extractable material in black pigments such as carbon
Height 70 mm 62 mm
black, lampblack, and bone black. Inside diameter 28 mm 22 mm
Outside diameter 30 mm 24 mm
1.2 The values stated in SI units are to be regarded as the
4.3 The thimbles are available in various heights and widths
standard. The values given in parentheses are for information
with two thickness levels, single thickness or double thickness.
only.
Single-thickness thimbles are recommended for this extraction
1.3 This standard does not purport to address all of the
procedure.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Reagents and Material
priate safety and health practices and determine the applica-
5.1 Purity of Reagents—Reagent grade chemicals shall be
bility of regulatory limitations prior to use.
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
2. Referenced Documents
tee onAnalytical Reagents of theAmerican Chemical Society,
2.1 ASTM Standards: 3
where such specifications are available. Other grades may be
D329 Specification for Acetone
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
3. Significance and Use
accuracy of the determination.
3.1 Thistestmethodisusedbyblackpigmentproducersand
5.2 Solvent—Acetone and benzene are the most commonly
users for product acceptance.
used solvents (see Specification D329); however, other sol-
4. Apparatus vents may be used as agreed upon.
4.1 Extraction Apparatus, consisting of a flask, siphon cup, 5.3 Glass Wool.
and a condenser similar to the apparatus shown in either Fig. 1
6. Procedure
or Fig. 2.
6.1 Weight approximately 10 g of pigment (moisture-free)
NOTE 1—A Sophlet apparatus may be used as an alternative.
into a weighed thimble and record the weight to 0.1 g. For
4.2 Extraction Thimbles—The thimble must be made of
pigments with high apparent density (bone black, iron oxides,
greaseless paper and be of correct size to fill the selected
etc.) a 40-g sample is recommended. Plug the open end of the
apparatus.
thimble with glass wool and place in the siphon cup. Add 200
to 250 mL of the solvent to the previously dried flask.
6.2 When using acetone as the extraction solvent, extract
continuously for 4 h, heating at a rate such that the time
requiredtofillandemptythesiphoncupwillnotexceed8min.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
With other solvents extract for 16 h.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.3
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