ASTM D7376-10a(2022)
(Practice)Standard Practice for Outdoor Evaluation of Wet Stack Storage Conditions on Coil-Coated Metals
Standard Practice for Outdoor Evaluation of Wet Stack Storage Conditions on Coil-Coated Metals
SIGNIFICANCE AND USE
4.1 This practice provides for periodic testing for resistance to wet conditions during storage to compare the relative performance of specific combinations of coatings, substrates, and/or pretreatments used on coil-coated metal. The results must be considered relative and do not indicate absolute performance.
4.2 When stored improperly, coil-coated building panel stacks can be exposed to rainwater, which flows into gaps between panels by capillary action or gravity, and remains in the gaps because of poor drainage conditions. Such a condition is known as a “wet stack” and may cause blistering and corrosion of the painted surfaces. This practice simulates such improper storage conditions.
4.3 Because the outdoor environment shows year-to-year seasonal and geographic climate variation, the absolute amount of degradation based on corrosion and blistering may vary (see Appendix X1).
4.4 Temperature, rain, humidity, and storage practices are important factors in wet stack corrosion. Corrosion and blistering will accelerate with increased temperature. The preferred test location is south of 27°N latitude in Florida. Other locations may be used, but differences in temperature and moisture must be considered, and the amount of corrosion and blistering are expected to vary considerably with climate. Test sites must have the instrumentation to measure and record ambient temperature and rainfall as in Practice G7.
4.5 This practice is not meant to support the field storage of coil-coated metal in any way other than what is recommended by the manufacturer.
SCOPE
1.1 This practice is used to determine the resistance to corrosion and blistering of coil-coated metal products relative to one another when stacked outdoors under direct weathering conditions in which they are wetted by rain and dew.
1.2 The coil-coated product variables evaluated may include, but are not limited to, substrates, pretreatments, primers, topcoats, and backers.
1.3 This test simulates a stacked building panel bundle stored at a job site in wet outdoor conditions. The results from panels tested during the same time period at the same physical location may be used to compare products as an indicator of relative field performance. Environments with higher temperature and moisture levels accelerate corrosion and blistering.
1.4 This standard does not endorse the storage of level (that is, 0° from horizontal) building panels stacks in wet outdoor conditions. Level storage of building panels is not recommended and is used in this standard for evaluation only.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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.
1.7 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
Relations
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: D7376 − 10a (Reapproved 2022)
Standard Practice for
Outdoor Evaluation of Wet Stack Storage Conditions on
Coil-Coated Metals
This standard is issued under the fixed designation D7376; 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 2. Referenced Documents
2.1 ASTM Standards:
1.1 This practice is used to determine the resistance to
D610 Practice for Evaluating Degree of Rusting on Painted
corrosion and blistering of coil-coated metal products relative
Steel Surfaces
to one another when stacked outdoors under direct weathering
D714 Test Method for Evaluating Degree of Blistering of
conditions in which they are wetted by rain and dew.
Paints
1.2 The coil-coated product variables evaluated may
D1654 Test Method for Evaluation of Painted or Coated
include, but are not limited to, substrates, pretreatments,
Specimens Subjected to Corrosive Environments
primers, topcoats, and backers.
G7 Practice for Natural Weathering of Materials
1.3 This test simulates a stacked building panel bundle
3. Summary of Practice
stored at a job site in wet outdoor conditions. The results from
3.1 This practice is for the evaluation of relative resistance
panels tested during the same time period at the same physical
to wet stack corrosion and blistering of coil-coated metal. The
location may be used to compare products as an indicator of
test is to be conducted in an outdoor environment with
relative field performance. Environments with higher tempera-
coil-coated panels placed on a flat surface while allowing
ture and moisture levels accelerate corrosion and blistering.
exposure to direct weather conditions including rain, dew, and
1.4 This standard does not endorse the storage of level (that
solar radiation.
is, 0° from horizontal) building panels stacks in wet outdoor
3.2 It is necessary to expose negative controls in each test
conditions. Level storage of building panels is not recom-
run, that is, products with known resistance to corrosion and
mended and is used in this standard for evaluation only.
blistering in this location, at the same time as the test product
1.5 The values stated in SI units are to be regarded as the to determine its resistance relative to controls.
standard. The values given in parentheses are for information
3.3 Panels are evaluated periodically for corrosion and
only.
blistering as specified in 6.7.
1.6 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 4.1 This practice provides for periodic testing for resistance
priate safety, health, and environmental practices and deter-
to wet conditions during storage to compare the relative
mine the applicability of regulatory limitations prior to use. performance of specific combinations of coatings, substrates,
and/or pretreatments used on coil-coated metal. The results
1.7 This international standard was developed in accor-
must be considered relative and do not indicate absolute
dance with internationally recognized principles on standard-
performance.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.2 When stored improperly, coil-coated building panel
mendations issued by the World Trade Organization Technical
stacks can be exposed to rainwater, which flows into gaps
Barriers to Trade (TBT) Committee.
between panels by capillary action or gravity, and remains in
the gaps because of poor drainage conditions. Such a condition
is known as a “wet stack” and may cause blistering and
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedJune1,2022.PublishedJuly2022.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 2007. Last previous edition approved in 2016 as D7376 – 10a(2016). DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7376-10AR22. the ASTM website.
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D7376 − 10a (2022)
corrosion of the painted surfaces. This practice simulates such 5.4 The apparatus shall be placed in an unsheltered location
improper storage conditions. that is subject to direct weathering conditions including rain,
dew, and solar radiation.
4.3 Because the outdoor environment shows year-to-year
seasonal and geographic climate variation, the absolute amount
6. Procedure
of degradation based on corrosion and blistering may vary (see
Appendix X1).
6.1 Awooden pallet or some flat surface with slats for water
drainage is assembled in the required location. See Section 5.
4.4 Temperature, rain, humidity, and storage practices are
important factors in wet stack corrosion. Corrosion and blis-
6.2 Testpanelsshallbegatheredandcuttotherequiredsize.
tering will accelerate with increased temperature. The pre-
A size of at least 15 cm by 15 cm (6 in. by 6 in.) is required.
ferred test location is south of 27°N latitude in Florida. Other
Duplicates of each panel are required to allow contact between
locations may be used, but differences in temperature and
the topside and backside of the same sample Panels to be
moisture must be considered, and the amount of corrosion and
compared must be cut on the same metal shear with edge burrs
blistering are expected to vary considerably with climate. Test
oriented in the same direction. Edge results may be signifi-
sites must have the instrumentation to measure and record
cantly influenced by burr differences. Corrosion ratings shall
ambient temperature and rainfall as in Practice G7.
include any visible red or white corrosion products.
4.5 This practice is not meant to support the field storage of
6.3 A minimum of two extra panels shall be placed at the
coil-coated metal in any way other than what is recommended
top and two at the bottom of the stack to act as a barrier to any
by the manufacturer.
influences from the wood or water accumulation.
6.4 The test panel numbers shall be recorded along with
5. Apparatus
information such as coil line, paint code, substrate, primer,
5.1 The use of a wooden or plastic pallet to stack the test
pretreatment, and date of test initiation.
panels in a horizontal position is one way to ensure rain does
notpuddlearoundthepanels.Rainwaterandcondensationflow
6.5 The test panels shall be stacked on top of one another
down the sides of the stacks, and water is drawn between with the convex side facing upward against the backer of a
panels by capillary action. Excess water will drain through the
duplicate panel to form a panel pair. If available, a duplicate
slats in the pallet (see Fig. 1). pair of panels is highly recommended. Negative controls are
required in order to provide a ref
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