ASTM D7376-10a(2016)

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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2016
• ICS: 77.060 - Corrosion of metals
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.53 - Coil Coated Metal

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 (Reapproved 2016)
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 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.
2.1 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
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 April 1, 2016. Published June 2016. Originally
improper storage conditions.
approved in 2007. Last previous edition approved in 2010 as D7376 – 10a. DOI:
10.1520/D7376-10AR16.
4.3 Because the outdoor environment shows year-to-year
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
D7376 − 10a (2016)
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 least 15 cm by 15 cm (6 in. by 6 in.) is required.
tering will accelerate with increased temperature. The pre- Duplicates of each panel are required to allow contact between
ferred test location is south of 27°N latitude in Florida. Other the topside and backside of the same sample Panels to be
locations may be used, but differences in temperature and compared must be cut on the same metal shear with edge burrs
moisture must be considered, and the amount of corrosion and oriented in the same direction. Edge results may be signifi-
blistering are expected to vary considerably with climate. Test cantly influenced by burr differences. Corrosion ratings shall
sites must have the instrumentation to measure and record include any visible red or white corrosion products.
ambient temperature and rainfall as in Practice G7.
6.3 A minimum of two extra panels shall be placed at the
4.5 This practice is not meant to support the field storage of top and two at the bottom of the stack to act as a barrier to any
coil-coated metal in any way other than what is recommended influences from the wood or water accumulation.
by the manufacturer.
6.4 The test panel numbers shall be recorded along with
information such as coil line, paint code, substrate, primer,
5. Apparatus
pretreatment, and date of test initiation.
5.1 The use of a wooden or plastic pallet to stack the test
6.5 The test panels shall be stacked on top of one another
panels in a horizontal position is one way to ensure rain does
with the convex side facing upward against the backer of a
notpuddlearoundthepanels.Rainwaterandcondensationflow
duplicate panel to form a panel pair. If available, a duplicate
down the sides of the stacks, and water is drawn between
pair of panels is highly recommended. Negative controls are
panels by capillary action. Excess water will drain through the
required in order to provide a reference point for test duration.
slats in the pallet (see Fig. 1).
6.6 Each stack of test panels shall be no greater than 5 cm
5.2 The pallet is recommended to be 61 cm to 91 cm (24 in.
(2 in.) in height and have no less than 8 panels and shall be
to 36 in.) from the ground and all foliage should be maintained
weighted down with a single wooden two by four with
so that it does not create shade on or contact with the test
cross-sectional dimensions, 4 cm by 9 cm (1.5 in. by 3.5 in.) on
panels.
top of each stack or spanning two or more stacks. The
...

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 − 10a D7376 − 10a (Reapproved 2016)
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
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
2.1 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
3.1 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.
3.2 It is necessary to expose negative controls in each test run, that is, products with known resistance to corrosion and blistering
in this location, at the same time as the test product to determine its resistance relative to controls.
3.3 Panels are evaluated periodically for corrosion and blistering as specified in 6.7.
4. 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.
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 June 1, 2010April 1, 2016. Published June 2010June 2016. Originally approved in 2007. Last previous edition approved in 2010 as
D7376 - 10.D7376 – 10a. DOI: 10.1520/D7376-10A.10.1520/D7376-10AR16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7376 − 10a (2016)
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.
5. Apparatus
5.1 The use of a wooden or plastic pallet to stack the test panels in a horizontal position is one way to ensure rain does not
puddle around the panels. Rainwater and condensation flow down the sides of the stacks, and water is drawn between panels by
capillary action. Excess water will drain through the slats in the pallet (see Fig. 1).
5.2 The pallet is recommended to be 61 cm to 91 cm (24 in. to 36 in.) from the ground and all foliage should be maintained
so that it does not create shade on or contact with the test panels.
5.3 Wooden two by four boards of approximate cross-sectional dimensions, 4 cm by 9 cm (1.5 in by 3.5 in.) and of the required
length are placed on top of the stacks (see Fig. 1). The pallets and boards shall be composed of untreated wood to avoid any
influence from the treatment.
5.4 The apparatus shall be placed in an unsheltered location that is subject to direct weathering conditions including rain, dew,
and solar radiation.
6. Procedure
6.1 A wooden pallet or some flat surface with slats for water drainage is assembled in the required location. See Section 5.
6.2 Test panels shall be gathered and cut to the required size. A size of at least 15 cm by 15 cm (6 in. by 6 in.) is required.
Duplicates of each panel are required to allow contact between the topside and backside of the same sample Panels to be compared
must be cut on the same metal shear with edge burrs oriented in the same direction. Edge results may be significantly influenced
by burr differences. Corrosion ratings shall include any visible red or white corrosion products.
6.3 A minimum of two extra panels shall be placed at the top and two at the bottom of the stack to act as a barrier to any
influences from the wood or water accumulation.
Note—Level position for test purposes only. Level storage of buildi
...