ASTM D1483-12

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Designation: D1483 − 12
Standard Test Method for
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Oil Absorption of Pigments by Gardner-Coleman Method
This standard is issued under the fixed designation D1483; 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.
1. Scope* method involves only a gentle stirring and folding of the
pigment. Because the end points are different, the values
1.1 This test method covers the determination of oil absorp-
2 obtained from the two test methods generally differ.
tion of pigments by the Gardner-Coleman procedure.
5. Apparatus and Materials
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
5.1 Balance, capable of weighing to 0.01 g.
only.
5.2 Glass Container, round-bottom, having a capacity of
1.3 This standard does not purport to address all of the
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250 mL ( ⁄2 pt), or a low-form 250-mL beaker.
safety concerns, if any, associated with its use. It is the
5.3 Buret, graduated in 0.1-mL divisions.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.4 Spatula, sharp-edged steel, having a blade 15 or 20 by
1 3
bility of regulatory limitations prior to use. 100 mm ( ⁄2 or ⁄4 by 4 in.).
5.5 Linseed Oil, raw, conforming to the following specifi-
2. Referenced Documents
cation:
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2.1 ASTM Standards:
Specific Gravity 0.926 – 0.931
D281Test Method for Oil Absorption of Pigments by
Boiling Point >149°C
Spatula Rub-out Acid Number 3 ± 1
Saponification Value 185 – 196
Iodine Value 170 minimum
3. Summary of Test Method
Gardner Color 13 maximum
3.1 A soft paste is formed by the dropwise addition of
6. Procedure
linseed oil to the gently stirred pigment. The amount of oil
6.1 The weight of pigment used should correspond to a
required to form the paste is used to calculate an oil absorption
value. pigment volume of 3.0 6 0.6 mL. Determine the weight
needed by multiplying 3.0 6 0.6 mLby the specific gravity of
4. Significance and Use
the pigment being tested. For example, a 20 g specimen
normally is used for zinc oxide (3.6 mL×5.6 g/mL=20.2 g).
4.1 The oil absorption value obtained by this test method
provides information about the vehicle demand of the pigment Transfer the amount, weighed to 0.01 g, to the glass container.
whenitisusedinapigmentpaste.Oilabsorptionvaluescanbe
6.2 Add oil from the buret at the rate of about 1 drop per
used to characterize batches of a given pigment.
second, stirring and “folding” the pigment continuously with
the spatula during the addition. Try to provide dry pigment for
4.2 This test method differs from Test Method D281 in that
D281 requires a vigorous rubbing action whereas this test theoiltostrike.Donotruborgrind;astheparticlesofpigment
become wetted, they collect in small lumps that gradually
coalesce. As the coalescence proceeds, reduce the rate of oil
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
addition by at least half. The end point is reached when the
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.24 on Physical Properties of Liquid Paints & Paint Materials.
lumps, with a rolling action from the spatula, collect into a
Current edition approved Feb. 1, 2012. Published February 2012. Originally
single ball or the excess of oil smears the wall of the container.
approved in 1957. Last previous edition approved in 2007 as D1483–95(2007).
DOI: 10.1520/D1483-12.
7. Calculation
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See Gardner, H. A. and Coleman, R. E., “Oil Absorption of Pigments,”
Scientific Section Circular 85, Paint Manufacturers’ Assoc. of the United States,
7.1 Calculate the oil absorption, A, as follows:
February 1920.
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M 30.93
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A 5 3100 (1)
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P
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard
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D1483 − 12
where: at 20 df. Based on these coefficients, the following criteria
should be used to judge the acceptability of results at the 95%
M = oil, mL, and
confidence level:
P = pigment, g.
9.1.1 Repeatability—Two results obtained by the same op-
0.93 represents density of oil (in grams per millilitr
...