ASTM D3925-91(1996)
(Practice)Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
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 The sampling of dry powder paints, clear coatings, mixed solvents, and nonpigmented materials of any type is not covered in this procedure.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation: D 3925 – 91 (Reapproved 1996)
Standard Practice for
Sampling Liquid Paints and Related Pigmented Coatings
This standard is issued under the fixed designation D 3925; 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. Sampling Considerations
1.1 This practice describes methods of taking representative 5.1 The use of common sense and good judgment is
samples of fluid paint or pigmented coating products from important even in the apparently simple task of taking samples.
containers of any type. 5.2 Use care to ensure that all containers, agitating equip-
1.2 The sampling of dry powder paints, clear coatings, ment, and sampling apparatus are clean and that they can in no
mixed solvents, and nonpigmented materials of any type is not way contaminate the sample being taken. Slight contamination
covered in this procedure. of the paint sample may lead to false test results.
1.3 This standard does not purport to address all of the 5.3 The sample container should be dry and not cooler than
safety concerns, if any, associated with its use. It is the the temperature of the area in which the sample is to be taken.
responsibility of the user of this standard to establish appro- 5.4 Because pigmented coatings are dispersions and not
priate safety and health practices and determine the applica- solutions, finely divided pigment particles dispersed in the
bility of regulatory limitations prior to use. coating vehicle may settle upon standing. Consequently, thor-
ough and careful agitation before sampling is necessary to
2. Referenced Documents
restore the paint to its original, uniform condition. The method
2.1 ASTM Standards: of agitating or stirring is therefore of prime importance.
D 1475 Test Method for Density of Paint, Varnish, Lacquer,
5.5 As soon as samples of paint are taken from the shipping
and Related Products or storage container, place them in clean, nonreactive, dry,
air-tight containers to prevent evaporation. Do not store
3. Terminology
samples in plastic bottles because volatile solvents may diffuse
3.1 Definitions of Term Specific to This Standard:
through the walls. Loss of volatile solvents may introduce
3.1.1 batch—the quantity of liquid paint or coating pro-
errors in such tests as viscosity, weight per gallon, and
duced in the final mixing operation after all production
nonvolatile content as well as other properties. If cap liners are
processes are complete. For example, when a number of
used, they should also be nonreactive with the material. If the
pigment dispersions are reduced with additional vehicle to-
sample is self reactive or highly volatile, appropriate sample
gether in a large tank, the resulting final mixture is one batch.
container precautions should be taken to prevent over-
pressurization of the container.
4. Significance and Use
5.6 When representative samples have been obtained and
4.1 Samples are taken from batches, lots, and shipments of
packaged in clean, closed containers, deliver them promptly to
paint in order to determine their uniformity and compliance
the testing laboratory. During the period between sampling and
with specification requirements. It is very important that these
delivery to the testing laboratory it is important that samples be
samples be of convenient and economical size and that they be
kept at temperatures from 40 to 100°F (5 to 40°C) because
representative of the batch of paint at the time it was filled into
extremes of temperature may change properties of some paint
shipping or storage containers.
products.
4.2 The time and effort necessary to ensure that the sample
6. Procedure
is representative of the original material will be repaid in
reduction of laboratory work and elimination of possible
6.1 Because of differences in physical properties, somewhat
rejections of acceptable material.
different procedures are required for agitating and sampling
those paints containing water as the volatile component in
comparison to those containing organic solvents. For coatings
This practice is under the jurisdiction of ASTM Committee D-1 on Paint and
with no volatile ingredients, use the method applicable to
Related Coatings, Materials, and Applications and is the direct responsibility of
materials containing organic solvents.
Subcommittee D01.20 on Quality Assurance and Statistics.
Current edition approved Sept. 15, 1991. Published November 1991. Originally 6.2 Pigmented Coatings Containing Organic Solvents—
e1
published as D 3925 – 80. Last previous edition D 3925 – 81 (1985) .
Materials in this group are of many different types but all
Annual Book of ASTM Standards, Vol 06.01.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 3925
contain organic solvents, not water, as their volatile portion and used. After thorough agitation, take samples from the top and
they are fluids, not dry powders. bottom of the drum and compare weights per gallon as
6.2.1 Smal
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