ASTM D1483-95

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Designation: D 1483 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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.
1. Scope 5. Apparatus and Materials
1.1 This test method covers the determination of oil absorp- 5.1 Balance, capable of weighing to 0.01 g.
tion of pigments by the Gardner-Coleman procedure. 5.2 Glass Container, round-bottom, having a capacity of
1.2 The values stated in SI units are to be regarded as the 250 mL ( ⁄2 pt), or a low-form 250-mL beaker.
standard. The values given in parentheses are for information 5.3 Buret, graduated in 0.1-mL divisions.
only. 5.4 Spatula, sharp-edged steel, having a blade 15 or 20 by
1 3
1.3 This standard does not purport to address all of the 100 mm ( ⁄2 or ⁄4 by 4 in.).
safety concerns, if any, associated with its use. It is the 5.5 Linseed Oil, Raw, conforming to Specification D 234
responsibility of the user of this standard to establish appro- except that it shall have an acid number of 3 6 1.
priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 The weight of pigment used should correspond to a
2. Referenced Documents
pigment volume of 3.0 6 0.6 mL. Determine the weight
2.1 ASTM Standards: needed by multiplying 3.0 6 0.6 mL by the specific gravity of
D 234 Specification for Raw Linseed Oil the pigment being tested. For example, a 20 g specimen
D 281 Test Method for Oil Absorption of Pigments by normally is used for zinc oxide (3.6 mL 3 5.6 g/mL 5 20.2 g).
Spatula Rub-Out Transfer the amount, weighed to 0.01 g, to the glass container.
6.2 Add oil from the buret at the rate of about 1 drop per
3. Summary of Test Method
second, stirring and “folding” the pigment continuously with
3.1 A soft paste is formed by the dropwise addition of
the spatula during the addition. Try to provide dry pigment for
linseed oil to the gently stirred pigment. The amount of oil the oil to strike. Do not rub or grind; as the particles of pigment
required to form the paste is used to calculate an oil absorption
become wetted, they collect in small lumps that gradually
value. coalesce. As the coalescence proceeds, reduce the rate of oil
addition by at least half. The end point is reached when the
4. Significance and Use
lumps, with a rolling action from the spatula, collect into a
4.1 The oil absorption value obtained by this test method
single ball or the excess of oil smears the wall of the container.
provides information about the vehicle demand of the pigment
7. Calculation
when it is used in a pigment paste. Oil absorption values can be
used to characterize batches of a given pigment. 7.1 Calculate the oil absorption, A, as
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