ASTM D3925-02(2010)
(Practice)Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
SIGNIFICANCE AND USE
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D3925 − 02 (Reapproved2010)
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 Department of Defense.
1. Scope 3. Terminology
1.1 This practice describes methods of taking representative 3.1 Definitions of Terms Specific to This Standard:
samples of fluid paint or pigmented coating products from 3.1.1 batch, n—the quantity of liquid paint or coating
containers of any type. produced in the final mixing operation after all production
processes are complete. For example, when a number of
1.2 Two ISO standards, ISO 1513 and ISO 15528, cover the
pigment dispersions are reduced with additional vehicle to-
details and equipment for sampling of liquid paints and
gether in a large tank, the resulting final mixture is one batch.
associated materials in much greater detail than this standard.
The reader is referred to those standards for more information
4. Significance and Use
1.3 The sampling of dry powder paints, clear coatings,
4.1 Samples are taken from batches, lots, and shipments of
mixed solvents, and nonpigmented materials of any type is not
paint in order to determine their uniformity and compliance
covered in this procedure.
with specification requirements. It is very important that these
samples be of convenient and economical size and that they be
1.4 The values stated in inch-pound units are to be regarded
representative of the batch of paint at the time it was filled into
as standard. The values given in parentheses are mathematical
shipping or storage containers.
conversions to SI units that are provided for information only
and are not considered standard.
4.2 The time and effort necessary to ensure that the sample
1.5 This standard does not purport to address all of the is representative of the original material will be repaid in
safety concerns, if any, associated with its use. It is the reduction of laboratory work and elimination of possible
responsibility of the user of this standard to establish appro- rejections of acceptable material.
priate safety and health practices and determine the applica-
5. Sampling Considerations
bility of regulatory limitations prior to use.
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-
2.2 ISO Documents:
nation of the paint sample may lead to false test results.
ISO 1513 Paints and varnishes—Examination and prepara-
5.3 The sample container should be dry and not cooler than
tion of samples for testing
the temperature of the area in which the sample is to be taken.
ISO15528 Paints,varnishesandrawmaterialsforpaintsand
5.4 Because pigmented coatings are dispersions and not
varnishes—Sampling
solutions, finely divided pigment particles dispersed in the
coating vehicle may settle upon standing. Consequently, thor-
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
ough and careful agitation before sampling is necessary to
Related Coatings, Materials, and Applications and is the direct responsibility of
restore the paint to its original, uniform condition. The method
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
of agitating or stirring is therefore of prime importance.
Current edition approved Dec. 1, 2010. Published December 2010. Originally
approved in 1980. Last previous edition approved in 2002 as D3925 – 02. DOI:
5.5 As soon as samples of paint are taken from the shipping
10.1520/D3925-02R10.
or storage container, place them in clean, nonreactive, dry,
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
air-tight containers to prevent evaporation. Do not store
Standards volume information, refer to the standard’s Document Summary page on
samples in plastic bottles because volatile solvents may diffuse
the ASTM website.
through the walls. Loss of volatile solvents may introduce
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. errors in such tests as viscosity, weight per gallon, and
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3925 − 02 (2010)
nonvolatile content as well as other properties. If cap liners are each sample in accordance with Test Method D1475. The two
used, they should also be nonreactive with the material. If the determinations should not differ more than 0.5 %. If the results
sample is self reactive or highly volatile, appropriate sample differ by more than this the paint is not thoroughly mixed.
container precautions should be taken to prevent over- Return the material to the original container, stir again, and
pressurization of the container. repeat the test.
6.2.2 Containers Larger than 5 Gal:
5.6 When representative samples have been obtained and
6.2.2.1 30 and 55-Gal Drums—From each batch select at
packaged in clean, closed containers, deliver them promptly to
random 5 % of but not more than three containers. Drums may
the testing laboratory. During the period between sampling and
be stirred satisfactorily by several means. With open-head
delivery
...
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