ASTM D1483-95(2002)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1483–95(Reapproved2002)
Standard Test Method for
Oil Absorption of Pigments by Gardner-Coleman Method
This standard is issued under the fixed designation D 1483; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4.2 This test method differs from Test Method D 281 in that
D 281 requires a vigorous rubbing action whereas this test
1.1 This test method covers the determination of oil absorp-
method involves only a gentle stirring and folding of the
tion of pigments by the Gardner-Coleman procedure.
pigment. Because the end points are different, the values
1.2 The values stated in SI units are to be regarded as the
obtained from the two test methods generally differ.
standard. The values given in parentheses are for information
only.
5. Apparatus and Materials
1.3 This standard does not purport to address all of the
5.1 Balance, capable of weighing to 0.01 g.
safety concerns, if any, associated with its use. It is the
5.2 Glass Container, round-bottom, having a capacity of
responsibility of the user of this standard to establish appro-
250 mL ( ⁄2 pt), or a low-form 250-mL beaker.
priate safety and health practices and determine the applica-
5.3 Buret, graduated in 0.1-mL divisions.
bility of regulatory limitations prior to use.
5.4 Spatula, sharp-edged steel, having a blade 15 or 20 by
1 3
2. Referenced Documents 100 mm ( ⁄2 or ⁄4 by 4 in.).
5.5 Linseed Oil, Raw, conforming to Specification D 234
2.1 ASTM Standards:
except that it shall have an acid number of 3 6 1.
D 234 Specification for Raw Linseed Oil
D 281 Test Method for Oil Absorption of Pigments by
6. Procedure
Spatula Rub-Out
6.1 The weight of pigment used should correspond to a
3. Summary of Test Method pigment volume of 3.0 6 0.6 mL. Determine the weight
needed by multiplying 3.0 6 0.6 mL by the specific gravity of
3.1 A soft paste is formed by the dropwise addition of
the pigment being tested. For example, a 20 g specimen
linseed oil to the gently stirred pigment. The amount of oil
normally is used for zinc oxide (3.6 mL 3 5.6 g/mL = 20.2 g).
required to form the paste is used to calculate an oil absorption
Transfer the amount, weighed to 0.01 g, to the glass container.
value.
6.2 Add oil from the buret at the rate of about 1 drop per
4. Significance and Use second, stirring and “folding” the pigment continuously with
the spatula during the addition. Try to provide dry pigment for
4.1 The oil absorption value obtained by this test method
the oil to strike. Do not rub or grind; as the particles of pigment
provides information about the vehicle demand of the pigment
become wetted, they collect in small lumps that gradually
when it is used in a pigment paste. Oil absorption values can be
coalesce. As the coalescence proceeds, reduce the rate of oil
used to characterize batches of a given pigment.
addition by at least half. The end point is reached when the
lumps, with a rolling action from the spatula, collect into a
single ball or the excess of oil smears the wall of the container.
This test method is
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