ASTM D185-07(2023)
(Test Method)Standard Test Methods for Coarse Particles in Pigments
Standard Test Methods for Coarse Particles in Pigments
SIGNIFICANCE AND USE
3.1 In production of paints, smoothness of the paint film is of paramount importance. Agglomerates or coarse particles larger than 45 μm are difficult to disperse and may prevent obtaining a smooth film. These test methods are a valuable quality control test for grading raw materials.
SCOPE
1.1 These test methods cover the determination of the amount of coarse particles in dry pigments.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
General Information
Relations
Standards Content (Sample)
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: D185 − 07 (Reapproved 2023)
Standard Test Methods for
Coarse Particles in Pigments
This standard is issued under the fixed designation D185; 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 45 μm sieve for comparison purposes should be retained in the
laboratory as a reference standard. Whenever a new sieve is
1.1 These test methods cover the determination of the
secured, a practical test of its accuracy should be made by
amount of coarse particles in dry pigments.
running on it and on the reference standard sieve a comparison
1.2 The values stated in SI units are to be regarded as the
test, using a pigment that has a considerable amount of coarse
standard. The values given in parentheses are for information
particles. A reserve stock of such a pigment should be kept for
only.
this purpose.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Procedure for Insoluble Dry Pigments, Except Metallic
responsibility of the user of this standard to establish appro-
Aluminum and Bronze Powders
priate safety, health, and environmental practices and deter-
5.1 Weigh approximately 100 g of a pigment specimen to
mine the applicability of regulatory limitations prior to use.
the nearest 0.1 g on an analytical balance. Wet the sieve on both
1.4 This international standard was developed in accor-
sides with water and transfer the pigment to the sieve.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.2 Hold the sieve under a tap delivering about 300 mL to
Development of International Standards, Guides and Recom-
500 mL of the wash liquid (water) per minute. Slightly shake
mendations issued by the World Trade Organization Technical
the sieve and move the stream of water around on the pigment
Barriers to Trade (TBT) Committee.
in the sieve to get the pigment to pass through the sieve. Use
a soft camel-hair brush to help the pigment wet out and pass
2. Referenced Documents
through the sieve. If the sieve is held at a slight angle so that
2.1 ASTM Standards:
the pigment gradually collects at one edge during the washing
E11 Specification for Woven Wire Test Sieve Cloth and Test
process, and then rotated, the pigment may be brushed out
Sieves
rapidly, with no risk of clogging the sieve. Continue the water
rinsing and brushing until no more pigment is passing through
3. Significance and Use
the sieve. This can be checked by tilting the sieve and
3.1 In production of paints, smoothness of the paint film is
inspecting the water passing through for pigment.
of paramount importance. Agglomerates or coarse particles
larger than 45 μm are difficult to disperse and may prevent 5.3 When pigment is no longer passing through the sieve,
obtaining a smooth film. These test methods are a valuable adjust
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