ASTM D6206-09(2021)

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: D6206 − 09 (Reapproved 2021)
Standard Practice for
Sampling of Coating Films
This standard is issued under the fixed designation D6206; 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.
1. Scope from the laboratory. The sampling procedure and packaging
will be dependent upon the reason for taking the sample.
1.1 This practice covers methods to remove samples of
coatingfilmsforsubsequentanalysisrelatedtoidentificationof
4. Procedure
generic coating type and failure analysis or other reasons.
4.1 General:
These techniques can be used in the field, the fabricating shop,
4.1.1 Contaminating samples must be avoided. Hands must
or laboratory.
be kept clean by washing or wearing protective covers such as
1.2 The method for obtaining coating samples for heavy
latex gloves. Contact the laboratory that will perform the
metal analysis is presented in Practice D5702.
analysis to determine if any other precautions are needed.
Clean blades or knife between each sample with a rag soaked
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information in solvent, or change blades between each sample.
4.1.2 The number and location of samples will vary depend-
only.
ing upon the reason for sampling. Document the sampling
1.4 This standard does not purport to address all of the
location prior to obtaining the sample. Measure and record dry
safety concerns, if any, associated with its use. It is the
filmthicknesses.Ifdelaminationispresent,measureandrecord
responsibility of the user of this standard to establish appro-
dry film thickness of the coating remaining in the delaminated
priate safety, health, and environmental practices and deter-
area as well as the intact area. Record the type of delamination,
mine the applicability of regulatory limitations prior to use.
that is, adhesive or cohesive, and the color of the coating
1.5 This international standard was developed in accor-
layer(s) where the delamination occurred. Document any other
dance with internationally recognized principles on standard-
visual defects such as alligatoring, mudcracking, checking,
ization established in the Decision on Principles for the
blistering, non-uniform appearance, or chalking.
Development of International Standards, Guides and Recom-
4.1.3 Obtain any history of the coating system available.
mendations issued by the World Trade Organization Technical
This should include when the coating was applied, the type of
Barriers to Trade (TBT) Committee.
coating,andintendeddryfilmthicknesses.Obtainacopyofthe
painting specification, if possible, to verify the information.
2. Referenced Documents
4.1.4 Photograph the sample area before and after obtaining
2.1 ASTM Standards:
the sample.
D4840 Guide for Sample Chain-of-Custody Procedures
4.1.5 Samples should be sent to the laboratory with a
D5702 Practice for Field Sampling of Coating Films for
chain-of-custody form, especially if there are existing or
Analysis for Heavy Metals
potential legal ramifications to the results of the laboratory
analysis. Guide D4840 presents the minimum requirements for
3. Significance and Use
sample chain-of-custody procedures.
3.1 Specimens for analysis must be adequately sampled,
4.2 Peeling Paint or Paint with Poor Adhesion:
packaged, and documented to obtain meaningful information
4.2.1 Samples should be taken that have not had both sides
exposed to the elements. Make an incision approximately 5 cm
(2-in.) long in the coating using a sharp knife blade (such as a
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
utility knife). Hold the blade at a low angle to the surface and
Related Coatings, Materials, and Applications and is the direct responsibility of
probe the incision by pushing forward on the knife.
Subcommittee D01.46 on Industrial Protective Coatings.
Alternatively, it may be possible to remove the sample by
Current edition approved Nov. 1, 2021. Published November 2021. Originally
cuttinga5cm (2-in.) square in the coating and peeling a
approved in 1997. Last previous edition approved in 2015 as D6206 – 09 (2015).
DOI: 10.1520/D6206-09R21.
sample by inserting the knife blade held at a low angle to the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
surface at one of the edges of the incision. For brittle coatings,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
masking tape may be used to hold the film together during
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. removal.
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D6206 − 09 (2021)
4.2.2 Obtain at least three samples, each sample being at immediately below the sampling location. Using a fine-grade
least 5 cm (2-in.) square. Smaller samples are allowed ifa5cm sandpaper or emery cloth, rub the surface in a circular pattern
(2-in.) square piece cannot be removed. Ensure that the three until enough coating to cover a fingernail has been removed
samples represent the same system. Place the samples in a from the surface. Examine the sampling location to determine
plastic bag, aluminum foil, or envelope. Mark the outside of if the top coat had been penetrated and the next coat is visible.
the bag or envelope with the identity of the sample, including (Discard the sample if the next coat is visible at the sampling
date, name of person taking the sample, project location, area location.) Place t
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