ASTM D5824-98(2003)
(Test Method)Standard Test Method for Determining Resistance to Delamination of Adhesive Bonds in Overlay-Wood Core Laminates Exposed to Heat and Water
Standard Test Method for Determining Resistance to Delamination of Adhesive Bonds in Overlay-Wood Core Laminates Exposed to Heat and Water
SIGNIFICANCE AND USE
This test method measures quantitatively the effects of water soaking and drying, and their associated swelling and shrinking stresses on adhesive bonds in overlay-laminated assemblies.
Adhesive bond performance is based on the ability of the adhesive and adhesive bonds to resist delamination during accelerated exposure to water and heat.
Resistance to delamination when subjected to environmental factors is critical to the performance of the laminated assembly in service.
This test method is to be used to determine the quality of adhesive bonds in overlay-wood core laminates after the adhesive has been certified by a specification appropriate for the product, class, and end use.
SCOPE
1.1 This test method provides a procedure to determine the quality of bond between an overlay and a wood core in an adhesively bonded laminate. The quality of bond is determined by measuring the resistance to delamination of the adhesively bonded laminate when tested under specific conditions of preparation, conditioning, and testing. Such products include, but are not limited to, window and door components, such as stiles and rails, and other overlaid panels. Typical wood-based cores are finger-jointed lumber, particleboard, oriented strand board, and hardboard. Typical overlays would be veneer, high-pressure laminate, high-density polyethylene, and fiberglass-reinforced plastic.
1.2 Adhesive bond performance as measured by resistance to delamination in this test method is suitable for use in adhesive product development, manufacturing quality control, and monitoring bonding processes.
1.3 This test method does not provide guidance for determining bond line performance for plywood products.
1.4 The values stated in inch-pound units are to be regarded as standard.
1.5 sponsibility 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D5824–98(Reapproved2003)
Standard Test Method for
Determining Resistance to Delamination of Adhesive Bonds
in Overlay-Wood Core Laminates Exposed to Heat and
Water
This standard is issued under the fixed designation D5824; 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 provides a procedure to determine the 2.1 ASTM Standards:
quality of bond between an overlay and a wood core in an D907 Terminology of Adhesives
adhesively bonded laminate.The quality of bond is determined D4442 Test Methods for Direct Moisture Content Measure-
by measuring the resistance to delamination of the adhesively ment of Wood and Wood-Base Materials
bonded laminate when tested under specific conditions of D5266 Practice for Estimating the Percentage of Wood
preparation, conditioning, and testing. Such products include, Failure in Adhesive Bonded Joints
but are not limited to, window and door components, such as E6 TerminologyRelatingtoMethodsofMechanicalTesting
stiles and rails, and other overlaid panels. Typical wood-based E41 Terminology Relating To Conditioning
cores are finger-jointed lumber, particleboard, oriented strand E177 Practice for Use of the Terms Precision and Bias in
board, and hardboard. Typical overlays would be veneer, ASTM Test Methods
high-pressure laminate, high-density polyethylene, and E691 Practice for Conducting an Interlaboratory Study to
fiberglass-reinforced plastic. Determine the Precision of a Test Method
1.2 Adhesive bond performance as measured by resistance
3. Terminology
to delamination in this test method is suitable for use in
adhesive product development, manufacturing quality control, 3.1 Definitions—Certain terms in this test method are de-
fined in Terminologies D907, E6, and E41.
and monitoring bonding processes.
1.3 This test method does not provide guidance for deter- 3.1.1 delamination, n—the separation of layers in a lami-
mining bond line performance for plywood products. nate because of failure of the adhesive, either in the adhesive
itselforattheinterfacebetweentheadhesiveandtheadherend.
1.4 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical (See Terminology D907.)
3.1.2 overlay, n—a uniform layer of material, usually in the
conversions to SI units that are provided for information only
and are not considered standard. form of a sheet, adhesively bonded to an adherend with the
purpose of improving the appearance or physical properties of
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the the laminate.
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 3.2.1 edge, n—in an adhesively bonded laminate, the di-
mension along its length [and parallel to the grain] where the
bility of regulatory limitations prior to use.
overlay is bonded to the core.
3.2.2 end, n—in an adhesively bonded laminate, the dimen-
sion which is perpendicular to the length of the laminate where
the overlay is bonded to the core.
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood
Adhesives For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 10, 2003. Published April 2003. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 1998 as D5824 – 98. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D5824-98R03. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5824–98 (2003)
4. Significance and Use nominalwidthofthepanelisused,theedgesaretobeprepared
as the product would exist in service.
4.1 This test method measures quantitatively the effects of
6.3 Test ten specimens, representing at least four different
water soaking and drying, and their associated swelling and
panels.
shrinking stresses on adhesive bonds in overlay-laminated
assemblies.
7. Preparation and Conditioning of Laboratory Test
4.2 Adhesive bond performance is based on the ability of
Panels
the adhesive and adhesive bonds to resist delamination during
7.1 Select veneer, either rotary cut or sliced, 0.063 in. (1.6
accelerated exposure to water and heat.
mm) in thickness, and wood-based core, a minimum of 0.5 in.
4.3 Resistance to delamination when subjected to environ-
(13 mm) in thickness, so that they are free from defects such as
mental factors is critical to the performance of the laminated
knots, cracks, rough surfaces, or any unusual amount of
assembly in service.
discoloration. The species and type of veneer and composition
4.4 Thistestmethodistobeusedtodeterminethequalityof
of the wood core are to be agreed upon between the purchaser
adhesive bonds in overlay-wood core laminates after the
and the manufacturer of the adhesive. As an alternative to
adhesive has been certified by a specification appropriate for
veneer, specific overlays can be used as agreed upon between
the product, class, and end use.
the purchaser and the adhesive manufacturer. Surface the core
5. Apparatus
to a thickness tolerance of 60.005 in. (0.13 mm) (see Table 1).
Iffinger-jointed/edge-bondedcorestockisused,itmustremain
5.1 Oven(s)—Forced-air oven capable of maintaining 170
intact without delamination during the test cycle. Both the
6 5°F (77 6 3°C), with sufficient air circulation to ensure that
veneer and the wood-based core are to be 61 % of the
the prescribed drying temperature is uniformly maintained
moisture content recommended by the manufacture of the
when the oven is fully loaded and the air flow is parallel to the
adhesive. In the absence of such a recommendation, the
faces of the specimens. A mechanism is to be provided for
moisture content is to be from 10 to 12 %, based on oven-dry
moisture to be removed from the chamber during drying of the
weight as determined on representative samples in accordance
specimens.
with Method A of Test Methods D4442. Cut the veneer and
5.1.1 Use an oven to accommodate a sufficient number of
wood core to a suitable size and grain orientation in order to
test specimens and to provide for at least 3-in. (76-mm)
build a panel with the grain of the veneer parallel to the grain
separation between the test specimens so that the drying
of the wood core. A size that has been found to be convenient
temperature is uniformly maintained.
is shown in Fig. 1.
5.2 Vacuum-Pressure Vessel—Autoclave or similar vessel
7.2 Follow the adhesive manufacturer’s instructions for
capable of withstanding 80-psi (562-kPa) pressure, equipped
conditions and procedures for preparing the adhesive and
with a pump or similar device capable of drawing a vacuum of
applying it to the wood core, as well as for assembling,
25 in. Hg (84.4 kPa). Provide a system so that pressure is
pressing, and curing the panel.
maintained at 75 psi (517 kPa).
7.3 After assembly, condition the panels for a period of
5.2.1 Use a vessel so that all the specimens are at least 2 in.
seven days (or until the panels reach equilibrium) at a relative
(51 mm) below the water level during the complete cycle.
humidity of 50 6 2 % and a temperature of 73.4 6 2°F (23 6
6. Test Specimens
1°C), or condition them in accordance with a specific recom-
mendation by the adhesive manufacturer.
6.1 Cut laboratory specimens from prepared test panels (see
Fig. 1) as described in Sections 7 and 8 to the form and
8. Preparation of Specimens
dimensions shown in Fig. 2 and Table 1.
6.2 Cut field specimens from test panels (see Fig. 3)tothe 8.1 Laboratory Specimens:
form and dimensions shown in Fig. 2 and Table 1. When the 8.1.1 Prepare the test panels as described in Section 7.
FIG. 1 Laboratory Test Panel
D5824–98 (2003)
FIG. 2 Form and
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.