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
- Status
- Published
- Publication Date
- 30-Nov-2022
- Technical Committee
- D01 - Paint and Related Coatings, Materials, and Applications
- Drafting Committee
- D01.21 - Chemical Analysis of Paints and Paint Materials
Relations
- Effective Date
- 01-Nov-2012
- Effective Date
- 01-Jun-2008
- Effective Date
- 01-Dec-2003
- Refers
ASTM D1475-98 - Standard Test Method for Density of Liquid Coatings, Inks, and Related Products - Effective Date
- 10-Oct-1998
Overview
ASTM D3925-02(2022), titled Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings, establishes procedures for obtaining representative samples of fluid paint and pigmented coating products from containers of any type. Developed by ASTM International and widely recognized in the coatings industry, this standard supports quality control and compliance processes by ensuring uniformity and adherence to specifications. It is particularly important in manufacturing, laboratory testing, and throughout the paint supply chain to reduce variability and minimize errors in test results.
Key Topics
Representative Sampling:
- Emphasizes the importance of collecting samples that accurately reflect the batch, lot, or shipment.
- Details steps for agitation, mixing, and handling to prevent settling of pigmented particles and to ensure homogeneous samples.
Sample Containers & Handling:
- Samples must be transferred to clean, dry, nonreactive, and airtight containers immediately to avoid contamination and evaporation of volatile solvents.
- Recommends avoiding plastic bottles due to possible diffusion of solvents through container walls.
Sampling Procedures:
- Outlines specific methods for small and large containers (including cans, drums, tote tanks, and tank wagons).
- Stresses thorough agitation of the entire container's contents to restore uniformity before sampling.
- For batches in small containers, random selection of a specified percentage or number of units is described.
- Ensures documented mixing and sampling techniques to compare top, middle, and bottom samples for consistency.
Compliance and Uniformity:
- Sampling is done to verify product conformity with quality standards and technical requirements.
- Representative sampling reduces laboratory workload and limits false rejections of acceptable materials.
Temperature and Storage:
- Maintaining samples at 40 °F to 100 °F (5 °C to 40 °C) is crucial to avoid property alterations before testing.
Applications
Quality Control in Manufacturing:
- Used by paint manufacturers and quality assurance teams to verify batch uniformity and specification compliance before distribution.
- Applies to both waterborne (latex) and solvent-based coatings to ensure consistency in production and shipment.
Regulatory Compliance:
- Meets requirements of organizations, including U.S. Department of Defense and other regulatory bodies, for standardized paint sampling.
Laboratory Analysis:
- Laboratories depend on ASTM D3925 procedures to ensure that test samples accurately represent the material received, supporting valid and reproducible analytical results.
Distribution and Field Testing:
- Paint distributors, contractors, and field technicians use this standard when sampling shipments for acceptance inspections or dispute resolution.
Related Standards
- ISO 1513: Paints and varnishes - Examination and preparation of samples for testing. Provides detailed guidance on sample examination and preparation for testing.
- ISO 15528: Paints, varnishes, and raw materials for paints and varnishes - Sampling. Covers equipment and detailed methods for sampling of liquid paints.
- ASTM D1475: Test Method for Density of Liquid Coatings, Inks, and Related Products. Frequently referenced during after-sampling analysis.
Practical Value
Implementing ASTM D3925 helps organizations:
- Ensure testing accuracy and traceability in quality assurance.
- Minimize product deviations due to improper or inconsistent sampling.
- Reduce waste and unnecessary laboratory work by preventing nonrepresentative sampling errors.
- Maintain compliance with domestic and international quality standards for liquid paints and pigmented coatings.
By following this standard sampling practice, stakeholders across production, distribution, and regulatory sectors can uphold high-quality industry benchmarks, increase customer confidence, and support effective supply chain management within the paint and coatings sector.
Frequently Asked Questions
ASTM D3925-02(2022) is a standard published by ASTM International. Its full title is "Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings". This standard covers: 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.
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.
ASTM D3925-02(2022) is classified under the following ICS (International Classification for Standards) categories: 87.060.01 - Paint ingredients in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D3925-02(2022) has the following relationships with other standards: It is inter standard links to ASTM D1475-98(2012), ASTM D1475-98(2008), ASTM D1475-98(2003), ASTM D1475-98. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D3925-02(2022) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...