ASTM D6294/D6294M-13(2019)
(Test Method)Standard Test Method for Corrosion Resistance of Ferrous Metal Fastener Assemblies Used in Roofing and Waterproofing
Standard Test Method for Corrosion Resistance of Ferrous Metal Fastener Assemblies Used in Roofing and Waterproofing
SIGNIFICANCE AND USE
5.1 It is important to evaluate the corrosion resistance of ferrous metal components used in low-slope roofing and waterproofing because they provide integrity and securement of other system components, such as insulation and membranes. Corrosion of ferrous metal components may result in their early deterioration and may lead to roofing or waterproofing system failure.
5.2 Results from testing ferrous metal components in an acidic atmosphere serve as an indication of the relative corrosion resistance of such components, coated or uncoated, to the environment of the test chamber. The results are not to be construed as a general guideline to the corrosion resistance of such components in other environments or in usage that may be conducive to corrosion.
5.3 Moist air containing sulfur dioxide quickly produces easily visible corrosion on many ferrous metals. It is therefore a test medium suited to detect pores or other sources of weakness in protective barrier coatings.
5.4 This test method applies primarily to evaluating the effectiveness of barrier coatings to provide general corrosion protection under test conditions. It is not intended to evaluate the resistance of the components to specific corrosion mechanisms such as crevice, galvanic, or stress corrosion.
5.5 This test method does not address abrasion resistance of barrier coatings when the fasteners are driven through above roof deck components, such as an existing built-up roof or insulations, or both.
5.6 Only the above deck portion of fasteners subjected to this test method is evaluated.
SCOPE
1.1 This test method covers components of ferrous metal fastener assemblies, excluding those of stainless steel, such as fasteners, stress plates, and batten bars used in low slope roofing and waterproofing, to a sulfurous acid environment. This test method evaluates relative corrosion resistance of the components by determination of percentage of rust or white rust.
1.2 The components may or may not have a surface treatment applied.
1.3 A limiting factor is the subjectiveness when determining actual percentage of rust or white rust corrosion.
1.4 Other performance characteristics of ferrous metal components such as abrasion resistance of barrier coatings are not evaluated in this method.
1.5 This test method was developed based on Practice G87.
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.7 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.
1.8 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:D6294/D6294M −13 (Reapproved 2019)
Standard Test Method for
Corrosion Resistance of Ferrous Metal Fastener Assemblies
Used in Roofing and Waterproofing
This standard is issued under the fixed designation D6294/D6294M; 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
1.1 This test method covers components of ferrous metal
2.1 ASTM Standards:
fastener assemblies, excluding those of stainless steel, such as
D16 TerminologyforPaint,RelatedCoatings,Materials,and
fasteners, stress plates, and batten bars used in low slope
Applications
roofing and waterproofing, to a sulfurous acid environment.
D1079 Terminology Relating to Roofing and Waterproofing
This test method evaluates relative corrosion resistance of the G15 Terminology Relating to Corrosion and Corrosion Test-
components by determination of percentage of rust or white
ing (Withdrawn 2010)
rust. G87 Practice for Conducting Moist SO Tests
1.2 The components may or may not have a surface treat-
3. Terminology
ment applied.
3.1 Definitions:
1.3 Alimiting factor is the subjectiveness when determining
3.1.1 For definitions of terms used in this test method, see
actual percentage of rust or white rust corrosion.
Terminology D1079, G15, and D16.
1.4 Other performance characteristics of ferrous metal com-
3.2 Definitions of Terms Specific to This Standard:
ponents such as abrasion resistance of barrier coatings are not
3.2.1 barrier—any material limiting passage through itself
evaluated in this method.
of solids, liquids, semi-solids, gases, vapors, or forms of
1.5 This test method was developed based on Practice G87.
energy such as ultraviolet light.
1.6 The values stated in either SI units or inch-pound units
3.2.2 surface treatment—a process by which the surface of
are to be regarded separately as standard. The values stated in
the ferrous metal component is treated with a barrier coating to
each system may not be exact equivalents; therefore, each
inhibit corrosion. Examples of barrier coatings for ferrous
system shall be used independently of the other. Combining
metal components include galvanization, zinc plating with or
values from the two systems may result in non-conformance
without yellow or clear chromate sealer, cadmium, mechanical
with the standard.
zinc plating and organic or inorganic polymers.
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 This test method exposes ferrous metal specimens to 15
priate safety, health, and environmental practices and deter-
or 30 (24) h cycles consisting of the following:
mine the applicability of regulatory limitations prior to use.
4.1.1 Eight (8) h exposure to the sulfur dioxide atmosphere
1.8 This international standard was developed in accor-
in a closed chamber.
dance with internationally recognized principles on standard-
4.1.2 An intermediate step of rinsing with distilled water,
ization established in the Decision on Principles for the
and
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 4.1.3 Sixteen (16) h of drying under vented conditions at
Barriers to Trade (TBT) Committee. controlled temperature and humidity.
1 2
This test method is under the jurisdiction ofASTM Committee D08 on Roofing For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Roofing Membrane Systems. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2019. Published June 2019. Originally the ASTM website.
approved in 1998. Last previous edition approved in 2013 as D6294/D6294M – 13. The last approved version of this historical standard is referenced on
DOI: 10.1520/D6294_D6294M-13R19. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6294/D6294M−13 (2019)
4.2 After drying, the test specimens are visually examined 8. Test Specimen
to evaluate the percentage of rust or white rust that formed on
8.1 Select the number of test specimens such that the total
the surface.
combined exposed surface area of the specimens at any one
2 2
4.3 The total surface area of the components exposed in the
time shall be 0.5 6 0.1 m [755 6 155 in. ].
2 2
chamber is 0.5 6 0.1 m [775 6 155 in. ].
8.2 It is allowable to mix the type of ferrous metal compo-
5. Significance and Use
nents (that is, fasteners, stress plates, an batten bars) in the test
chamber, provided that the different components do not have
5.1 It is important to evaluate the corrosion resistance of
vastly different resistance to corrosion under test conditions.
ferrous metal components used in low-slope roofing and
The different types of components that may be evaluated in the
waterproofing because they provide integrity and securement
chamber simultaneously are to be agreed upon between the
of other system components, such as insulation and mem-
laboratory and client requesting the test.
branes. Corrosion of ferrous metal components may result in
their early deterioration and may lead to roofing or waterproof-
NOTE 1—The laboratory may have to conduct preliminary cycling tests
ing system failure.
to estimate the relative resistance of each component.
NOTE 2—Specimens may be produced by the laboratory showing 10,
5.2 Results from testing ferrous metal components in an
15, 20, and 30 % rust or white rust surface corrosion to be used as controls
acidic atmosphere serve as an indication of the relative
to aid in the test result evaluation in accordance with 10.1.3 and 11.1.6.
corrosion resistance of such components, coated or uncoated,
8.3 To obtain quantitative corrosion-rate data, only ferrous
to the environment of the test chamber. The results are not to
metal components with similar reactivities should be included
be construed as a general guideline to the corrosion resistance
in a test run.
ofsuchcomponentsinotherenvironmentsorinusagethatmay
be conducive to corrosion.
8.4 Roof Fastener Test Specimens:
5.3 Moist air containing sulfur dioxide quickly produces
8.4.1 Fastenersofanylengthmaybetestedaccordingtothis
easily visible corrosion on many ferrous metals. It is therefore
method.Thelengthistobeagreeduponbetweenthelaboratory
a test medium suited to detect pores or other sources of
and client.
weakness in protective barrier coatings.
8.4.2 Roof fasteners are evaluated in this method in relation
to deck materials into which they are expected to be installed
5.4 This test method applies primarily to evaluating the
in service. For purposes of this test method, these deck
effectiveness of barrier coatings to provide general corrosion
materials are structural concrete, lightweight insulating
protection under test conditions. It is not intended to evaluate
concrete, cementitious wood fiber, gypsum, metal, and wood.
the resistance of the components to specific corrosion mecha-
Prepare the fastener test specimens as follows:
nisms such as crevice, galvanic, or stress corrosion.
8.4.3 Fasteners for Concrete Decks:
5.5 This test method does not address abrasion resistance of
8.4.3.1 Use nominal 20.7 MPa [3000 lb/in ] 75 mm [3 in.]
barrier coatings when the fasteners are driven through above
minimumthicknessconcretedeckthathascuredaminimumof
roof deck components, such as an existing built-up roof or
28 days. Install the fastener, in accordance with the manufac-
insulations, or both.
ture’s specifications, a minimum of 25 mm [1 in.] 6 10 % into
5.6 Only the above deck portion of fasteners subjected to
the deck.
this test method is evaluated.
8.4.3.2 Use a separate hole location on the deck sample(s)
6. Apparatus
for each fastener.
8.4.4 Fasteners for Lightweight Insulating Concrete Decks:
6.1 The apparatus required for evaluating the corrosion
resistanceofthecomponentsconsistsofatestchamber having 8.4.4.1 Use 75 mm [3 in.] minimum thickness nominal 480
an internal capacity of 300 L [10.6 ft ], a supply of sulfur
kg/m [30 pcf] lightweight insulating concrete deck that has
dioxide with metering device, specimen supports, provisions cured a minimum 28 days. Install the fastener, in accordance
for heating the chamber, and necessary means of control. The
with the manufacture’s specifications, a minimum of 25 mm [1
size and detailed construction of the apparatus shall be in in.] 6 10 % into the deck.
accordance with Section 4 of Practice G87.
8.4.4.2 Use a separate hole location on the concrete deck
sample(s) for each fastener.
7. Reagents
8.4.5 Fasteners for Cementitious Wood Fiber Decks:
7.1 The reagents, (that is, sulfur dioxide and wate
...
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