ASTM D7376-10a

Standard Practice for Outdoor Evaluation of Wet Stack Storage Conditions on Coil-Coated Metals

SIGNIFICANCE AND USE
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.
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.
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).  
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 77.060 - Corrosion of metals
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.53 - Coil Coated Metal

Relations

• Replaces: ASTM D7376-10 - Standard Practice for Outdoor Evaluation of Wet Stack Storage Conditions on Coil-Coated Metals
• Effective Date: 01-Jun-2010
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7376 − 10a
StandardPractice for
Outdoor Evaluation of Wet Stack Storage Conditions on
1
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 D714 Test Method for Evaluating Degree of Blistering of
Paints
1.1 This practice is used to determine the resistance to
D1654 Test Method for Evaluation of Painted or Coated
corrosion and blistering of coil-coated metal products relative
Specimens Subjected to Corrosive Environments
to one another when stacked outdoors under direct weathering
G7 Practice for Atmospheric Environmental Exposure Test-
conditions in which they are wetted by rain and dew.
ing of Nonmetallic Materials
1.2 The coil-coated product variables evaluated may
include, but are not limited to, substrates, pretreatments,
3. Summary of Practice
primers, topcoats, and backers.
3.1 This practice is for the evaluation of relative resistance
1.3 This test simulates a stacked building panel bundle
to wet stack corrosion and blistering of coil-coated metal. The
stored at a job site in wet outdoor conditions. The results from
test is to be conducted in an outdoor environment with
panels tested during the same time period at the same physical
coil-coated panels placed on a flat surface while allowing
location may be used to compare products as an indicator of
exposure to direct weather conditions including rain, dew, and
relative field performance. Environments with higher tempera-
solar radiation.
ture and moisture levels accelerate corrosion and blistering.
1.4 This standard does not endorse the storage of level (that 3.2 It is necessary to expose negative controls in each test
is, 0° from horizontal) building panels stacks in wet outdoor
run, that is, products with known resistance to corrosion and
conditions. Level storage of building panels is not recom- blistering in this location, at the same time as the test product
mended and is used in this standard for evaluation only.
to determine its resistance relative to controls.
1.5 The values stated in SI units are to be regarded as the
3.3 Panels are evaluated periodically for corrosion and
standard. The values given in parentheses are for information
blistering as specified in 6.7.
only.
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
4.1 This practice provides for periodic testing for resistance
responsibility of the user of this standard to establish appro-
to wet conditions during storage to compare the relative
priate safety and health practices and determine the applica-
performance of specific combinations of coatings, substrates,
bility of regulatory limitations prior to use.
and/or pretreatments used on coil-coated metal. The results
must be considered relative and do not indicate absolute
2. Referenced Documents
performance.
2
2.1 ASTM Standards:
D610 Practice for Evaluating Degree of Rusting on Painted 4.2 When stored improperly, coil-coated building panel
Steel Surfaces
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
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
is known as a “wet stack” and may cause blistering and
Related Coatings, Materials, and Applications and is the direct responsibility of
corrosion of the painted surfaces. This practice simulates such
Subcommittee D01.53 on Coil Coated Metal.
Current edition approved June 1, 2010. Published June 2010. Originally
improper storage conditions.
approved in 2007. Last previous edition approved in 2010 as D7376 - 10. DOI:
10.1520/D7376-10A.
4.3 Because the outdoor environment shows year-to-year
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
seasonal and geographic climate variation, the absolute amount
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
of degradation based on corrosion and blistering may vary (see
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Appendix X1).
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
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D7376 − 10a
4.4 Temperature, rain, humidity, and storage practices are 6.2 Testpanelsshallbegatheredandcuttotherequiredsize.
important factors in wet stack corrosion. Corrosion and blis- A size of at lea
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7376–10 Designation: D7376 – 10a
Standard Practice for
Outdoor Evaluation of Wet Stack Storage Conditions on
1
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
1.1This procedure describes the practice for determining relative performance of coil-coated metal in an outdoor wet stack
testing environment.
1.2Thepurposeofthistestistoevaluaterelativewetstackcorrosionresistanceandblistering.Substrates,pretreatments,primers,
topcoats, and backers may be evaluated.
1.3This test simulates coil or stacked building panel bundle storage at a job site in wet outdoor conditions. The results from
panels tested during the same time period may be used to compare products as an indicator of actual field performance.
Environments with higher temperature and moisture levels accelerate degradation.
1.4The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
D714 Test Method for Evaluating Degree of Blistering of Paints
D1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
3. Summary of Practice
3.1This practice is for the evaluation of relative wet stack corrosion resistance and blistering of coil-coated metal. The test is
to be conducted in an outdoor environment with coil-coated panels placed on a flat surface while allowing exposure to
environmental conditions such as rain, dew, humidity, and high temperatures.
3.2Panels are evaluated periodically for corrosion and blistering as specified in
3.1 This practice is for the evaluation of relative resistance to wet stack corrosion and blistering of coil-coated metal. The test
is to be conducted in an outdoor environment with coil-coated panels placed on a flat surface while allowing exposure to direct
weather conditions including rain, dew, and solar radiation.
1
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.
Current edition approved Feb.June 1, 2010. Published FebruaryJune 2010. Originally approved in 2007. Last previous edition approved in 20072010 as D7376 - 107. DOI:
10.1520/D7376-10A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
1

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