ASTM D3925-02(2022)
(Practice)Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
SIGNIFICANCE AND USE
4.1 Samples are taken from batches, lots, and shipments of paint in order to determine their uniformity and compliance with specification requirements. It is very important that these samples be of convenient and economical size and that they be representative of the batch of paint at the time it was filled into shipping or storage containers.
4.2 The time and effort necessary to ensure that the sample is representative of the original material will be repaid in reduction of laboratory work and elimination of possible rejections of acceptable material.
SCOPE
1.1 This practice describes methods of taking representative samples of fluid paint or pigmented coating products from containers of any type.
1.2 Two ISO standards, ISO 1513 and ISO 15528, cover the details and equipment for sampling of liquid paints and associated materials in much greater detail than this standard. The reader is referred to those standards for more information.
1.3 The sampling of dry powder paints, clear coatings, mixed solvents, and nonpigmented materials of any type is not covered in this procedure.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 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.
1.6 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: D3925 − 02 (Reapproved 2022)
Standard Practice for
Sampling Liquid Paints and Related Pigmented Coatings
This standard is issued under the fixed designation D3925; 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 2.2 ISO Documents:
ISO 1513 Paints and varnishes—Examination and prepara-
1.1 This practice describes methods of taking representative
tion of samples for testing
samples of fluid paint or pigmented coating products from
ISO15528 Paints,varnishesandrawmaterialsforpaintsand
containers of any type.
varnishes—Sampling
1.2 Two ISO standards, ISO 1513 and ISO 15528, cover the
details and equipment for sampling of liquid paints and
3. Terminology
associated materials in much greater detail than this standard.
3.1 Definitions of Terms Specific to This Standard:
The reader is referred to those standards for more information.
3.1.1 batch, n—the quantity of liquid paint or coating
1.3 The sampling of dry powder paints, clear coatings,
produced in the final mixing operation after all production
mixed solvents, and nonpigmented materials of any type is not
processes are complete. For example, when a number of
covered in this procedure.
pigment dispersions are reduced with additional vehicle to-
gether in a large tank, the resulting final mixture is one batch.
1.4 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4. Significance and Use
conversions to SI units that are provided for information only
and are not considered standard.
4.1 Samples are taken from batches, lots, and shipments of
paint in order to determine their uniformity and compliance
1.5 This standard does not purport to address all of the
with specification requirements. It is very important that these
safety concerns, if any, associated with its use. It is the
samples be of convenient and economical size and that they be
responsibility of the user of this standard to establish appro-
representative of the batch of paint at the time it was filled into
priate safety, health, and environmental practices and deter-
shipping or storage containers.
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
4.2 The time and effort necessary to ensure that the sample
dance with internationally recognized principles on standard-
is representative of the original material will be repaid in
ization established in the Decision on Principles for the
reduction of laboratory work and elimination of possible
Development of International Standards, Guides and Recom-
rejections of acceptable material.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Sampling Considerations
5.1 The use of common sense and good judgment is
2. Referenced Documents
important even in the apparently simple task of taking samples.
2.1 ASTM Standards:
5.2 Use care to ensure that all containers, agitating
D1475 Test Method for Density of Liquid Coatings, Inks,
equipment, and sampling apparatus are clean and that they can
and Related Products
in no way contaminate the sample being taken. Slight contami-
nation of the paint sample may lead to false test results.
5.3 The sample container should be dry and not cooler than
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
the temperature of the area in which the sample is to be taken.
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
5.4 Because pigmented coatings are dispersions and not
Current edition approved Dec. 1, 2022. Published December 2022. Originally
approved in 1980. Last previous edition approved in 2015 as D3925 – 02 (2015).
solutions, finely divided pigment particles dispersed in the
DOI: 10.1520/D3925-02R22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3925 − 02 (2022)
coating vehicle may settle upon standing. Consequently, thor- 11lb(1.3g/mL)orlessontheshakerfor10minandthosewith
ough and careful agitation before sampling is necessary to a weight per gallon of more than 11 lb for 20 min.
restore the paint to its original, uniform condition. The method 6.2.1.4 Once the contents have been thoroughly agitated,
of agitating or stirring is therefore of prime importance. pourhalfofthematerialintoanemptycontainerandtakea1 qt
(1 L) (or smaller if taken from a container of 1 qt or less)
5.5 As soon as samples of paint are taken from the shipping
sample from each half. Determine the weight per gallon on
or storage container, place them in clean, nonreactive, dry,
each sample in accordance with Test Method D1475. The two
air-tight containers to prevent evaporation. Do not store
determinations should not differ more than 0.5 %. If the results
samples in plastic bottles because volatile solvents may diffuse
differ by more than this the paint is not thoroughly mixed.
through the walls. Loss of volatile solvents may introduce
Return the material to the original container, stir again, and
errors in such tests as viscosity, weight per gallon, and
repeat the test.
nonvolatile content as well as other properties. If cap liners are
6.2.2 Containers Larger than 5 Gal:
used, they should also be n
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