ASTM D6294-98(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6294 – 98 (Reapproved 2003)
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; 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 3. Terminology
1.1 This test method covers components of ferrous metal 3.1 Definitions:
fastener assemblies, excluding those of stainless steel, such as 3.1.1 For definitions of terms used in this test method, see
fasteners, stress plates, and batten bars used in low slope Terminology D1079, G15, and D16.
roofing and waterproofing, to a sulfurous acid environment. 3.2 Definitions of Terms Specific to This Standard:
This test method evaluates relative corrosion resistance of the 3.2.1 barrier—any material limiting passage through itself
components by determination of percentage of rust or white of solids, liquids, semi-solids, gases, vapors, or forms of
rust. energy such as ultraviolet light.
1.2 The components may or may not have a surface treat- 3.2.2 surface treatment—a process by which the surface of
ment applied. the ferrous metal component is treated with a barrier coating to
1.3 Alimiting factor is the subjectiveness when determining inhibit corrosion. Examples of barrier coatings for ferrous
actual percentage of rust or white rust corrosion. metal components include galvanization, zinc plating with or
1.4 Other performance characteristics of ferrous metal com- without yellow or clear chromate sealer, cadmium, mechanical
ponents such as abrasion resistance of barrier coatings are not zinc plating and organic or inorganic polymers.
evaluated in this method.
4. Summary of Test Method
1.5 This test method was developed based on Practice G87.
4.1 This test method exposes ferrous metal specimens to 15
1.6 The values stated in SI units are to be regarded as the
standard. The inch-pound values given in parentheses may be or 30 (24) h cycles consisting of the following:
4.1.1 Eight (8) h exposure to the sulfur dioxide atmosphere
approximate, and are presented for information purposes.
in a closed chamber.
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.1.2 An intermediate step of rinsing with distilled water,
and
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 4.1.3 Sixteen (16) h of drying under vented conditions at
controlled temperature and humidity.
bility of regulatory limitations prior to use.
4.2 After drying, the test specimens are visually examined
2. Referenced Documents
to evaluate the percentage of rust or white rust that formed on
2.1 ASTM Standards: the surface.
D16 Terminology for Paint, Related Coatings, Materials, 4.3 The total surface area of the components exposed in the
3 2 2
and Applications chamber is 0.5 6 0.1 m (775 6 155 in. ).
D1079 Terminology Relating to Roofing and Waterproofing
4 5. Significance and Use
G15 Terminology Relating to Corrosion and Corrosion 5.1 It is important to evaluate the corrosion resistance of
ferrous metal components used in low-slope roofing and
Testing
G87 Practice for Conducting Moist SO Tests waterproofing because they provide integrity and securement
of other system components, such as insulation and mem-
branes. Corrosion of ferrous metal components may result in
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
their early deterioration and may lead to roofing or waterproof-
and Waterproofing and is the direct responsibility of Subcommittee D08.20 on
ing system failure.
Roofing Membrane Systems.
Current edition approved July 10, 2003. Published July 2003. Originally
5.2 Results from testing ferrous metal components in an
approved in 1998. Last previous edition approved in 1998 as D6294 – 98. DOI:
acidic atmosphere serve as an indication of the relative
10.1520/D6294-98R03.
2 corrosion resistance of such components, coated or uncoated,
Annual Book of ASTM Standards, Vol 06.01.
to the environment of the test chamber. The results are not to
Annual Book of ASTM Standards, Vol 04.04.
Annual Book of ASTM Standards, Vol 03.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6294 – 98 (2003)
be construed as a general guideline to the corrosion resistance 8.4.1 Fastenersofanylengthmaybetestedaccordingtothis
ofsuchcomponentsinotherenvironmentsorinusagethatmay method.Thelengthistobeagreeduponbetweenthelaboratory
be conducive to corrosion. and client.
5.3 Moist air containing sulfur dioxide quickly produces 8.4.2 Roof fasteners are evaluated in this method in relation
easily visible corrosion on many ferrous metals. It is therefore to deck materials into which they are expected to be installed
a test medium suited to detect pores or other sources of in service. For purposes of this test method, these deck
weakness in protective barrier coatings. materials are structural concrete, lightweight insulating con-
5.4 This test method applies primarily to evaluating the crete, cementitious wood fiber, gypsum, metal, and wood.
effectiveness of barrier coatings to provide general corrosion Prepare the fastener test specimens as follows:
protection under test conditions. It is not intended to evaluate 8.4.3 Fasteners for Concrete Decks:
the resistance of the components to specific corrosion mecha- 8.4.3.1 Use nominal 20.7 MPa (3000 lb/in ) 75 mm (3 in.)
nisms such as crevice, galvanic, or stress corrosion. minimum thickness concrete deck that has cured a minimum of
5.5 This test method does not address abrasion resistance of 28 days. Install the fastener, in accordance with the manufac-
barrier coatings when the fasteners are driven through above ture’s specifications, a minimum of 25 mm (1 in.) 6 10 % into
roof deck components, such as an existing built-up roof or the deck.
insulations, or both. 8.4.3.2 Use a separate hole location on the deck sample(s)
5.6 Only the above deck portion of fasteners subjected to for each fastener.
this test method is evaluated. 8.4.4 Fasteners for Lightweight Insulating Concrete Decks:
8.4.4.1 Use 75 mm (3 in.) minimum thickness nominal 480
6. Apparatus
kg/m (30 pcf) lightweight insulating concrete deck that has
cured a minimum 28 days. Install the fastener, in accordance
6.1 The apparatus required for evaluating the corrosion
with the manufacture’s specifications, a minimum of 25 mm (1
resistanceofthecomponentsconsistsofatestchamber having
an internal capacity of 300 L (10.6 ft ), a supply of sulfur in.) 6 10 % into the deck.
8.4.4.2 Use a separate hole location on the concrete deck
dioxide with metering device, specimen supports, provisions
for heating the chamber, and necessary means of control. The sample(s) for each fastener.
8.4.5 Fasteners for Cementitious Wood Fiber Decks:
size and detailed construction of the apparatus shall be in
accordance with Section 4 of Practice G87. 8.4.5.1 Use 75 mm (3 in.) minimum thickness cementitious
wood fiber deck. Install the fastener, in accordance with
7. Reagents
manufacture’s specifications, a minimum of 25 mm (1 in.) 6
10 % into the deck.
7.1 The reagents, (that is, sulfur dioxide and water), their
8.4.5.2 Use a separate hole location on the deck sample(s)
purity,andthemeansforintroducingthesulfurdioxideintothe
for each fastener.
test chamber shall be in accordance with Section 7 of Practice
8.4.6 Fasteners for Gypsum Decks:
G87.
8.4.6.1 Use 75 mm (3 in.) minimum thickness poured
8. Test Specimen gypsum deck that has cured a minimum of 28 days to a
maximum 90 days. Install the fastener, in accordance with the
8.1 Select the number of test specimens such that the total
manufacture’s specifications, a minimum of 25 mm (1 in.) 6
combined exposed surface area of the specimens at any one
2 2
10 % into the deck.
time shall be 0.5 6 0.1 m (755 6 155 in. ).
8.4.6.2 Use a separate hole location on the deck sample(s)
8.2 It is allowable to mix the type of ferrous metal compo-
for each fastener.
nents (that is, fasteners, stress plates, an batten bars) in the test
8.4.7 For the decks referenced in 8.4.3 through8.4.6 remove
chamber, provided that
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