ASTM D6206-97

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 6206 – 97
Standard Practice for
Sampling of Coating Films
This standard is issued under the fixed designation D 6206; 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 film thicknesses. If delamination is present, measure and record
dry film thickness of the coating remaining in the delaminated
1.1 This practice covers methods to remove samples of
area as well as the intact area. Record the type of delamination,
coating films for subsequent analysis related to identification of
that is, adhesive or cohesive, and the color of the coating
generic coating type and failure analysis or other reasons.
layer(s) where the delamination occurred. Document any other
These techniques can be used in the field, the fabricating shop,
visual defects such as alligatoring, mudcracking, checking,
or laboratory.
blistering, non–uniform appearance, or chalking.
1.2 The method for obtaining coating samples for heavy
4.1.3 Obtain any history of the coating system available.
metal analysis is presented in Practice D 5702.
This should include when the coating was applied, the type of
1.3 This standard does not purport to address all of the
coating, and intended dry film thicknesses. Obtain a copy of the
safety concerns, if any, associated with its use. It is the
painting, if possible, to verify the information.
responsibility of the user of this standard to establish appro-
4.1.4 Photograph the sample area before and after obtaining
priate safety and health practices and determine the applica-
the sample.
bility of regulatory limitations prior to use.
4.1.5 Samples should be sent to the laboratory with a
2. Referenced Documents
chain–of–custody form, especially if there are genuine or
potential legal ramifications to the results of the laboratory
2.1 ASTM Standards:
analysis. Guide D 4840 presents the minimum requirements for
D 4840 Guide for Sampling Chain–of–Custody Procedures
sample chain–of–custody procedures.
D 5702 Practice for Field Sampling of Coating Films for
4.2 Peeling Paint or Paint with Poor Adhesion:
Analysis for Heavy Metals
4.2.1 Samples should be taken that have not had both sides
3. Significance and Use
exposed to the elements. Make an incision approximately 2 in.
long in the coating using a sharp knife blade (such as a utility
3.1 Specimens for analysis must be adequately sampled,
knife). Hold the blade at a low angle to the surface and probe
packaged, and documented to obtain meaningful information
the incision by pushing forward on the knife. Alternatively, it
from the laboratory. The sampling procedure and packaging
may be possible to remove the sample by cutting a 2–in. square
will be dependent upon the reason for taking the sample.
in the coating and peeling a sample by inserting the knife blade
4. Procedure
held at a low angle to the surface at one of the edges of the
incision. For brittle coatings, masking tape may be used to hold
4.1 General:
the film together during removal.
4.1.1 Contaminating samples must be avoided. Hands must
4.2.2 Obtain at least three samples, each sample being at
be kept clean by washing or wearing protective covers such as
least 2–in. square. Smaller samples are allowed if a 2–in.
latex gloves. Contact the laboratory that will perform the
square piece cannot be removed. Ensure that the three samples
analysis to determine if any other precautions are needed.
represent the same system. Place the samples in a plastic bag or
Clean blades or knife between each sample with a rag soaked
envelope. Mark the outside of the bag or envelope with the
in solvent, or change blades between each sample.
identity of the sample, including date, name of person taking
4.1.2 The number and location of samples will vary depend-
the sample, project location, area location, and type of sample.
ing upon the reason for sampling. Document the sampling
Use a different container for each area sampled.
location prior to obtaining the sample. Measure and record dry
4.2.3 Place a mark on the outer surface of the coating chip
using a felt–tipped pen or other available marker. If analysis of
This practice is under the jurisdiction of ASTM Committee D–1 on Paint and
the topcoat is desired, identify the topcoat and disbondment
Related Coatings, Materials, and Applications and is the direct responsibility of
surfaces in the documentation using attributes such as color,
Subcommittee D01.46 on Industrial Protective Coatings.
gloss, or obvious presence of a foreign substance. Record the
Current edition approved Dec. 10, 1997. Published February 1998.
Annual Book of ASTM Standards, Vol 11.01. location where the sample was obtained, whether the failure
Annual Book of ASTM Standards, Vol 06.02.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D6206–97
plane was between coats or within a coat, and the identification available, take the paper and place the sample in the middle of
of the top coat and disbondment surfaces. Request the labora- the trough by li
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