ASTM E1794-00
(Specification)Standard Specification for Adhesive for Bonding Foam Cored Sandwich Panels (200oF Elevated Humidity Service), Type II Panels
Standard Specification for Adhesive for Bonding Foam Cored Sandwich Panels (200<sup>o</sup>F Elevated Humidity Service), Type II Panels
SCOPE
1.1 This specification covers two-part paste adhesives for bonding foam core sandwich panels. The adhesive may be used for new production or depot maintenance. The adhesive should be suitable for forming bonds that can withstand long-term exposure to temperatures from -55 to 93oC (-67 to 200oF) and also withstand combinations of stress, temperature, and humidity expected to be encountered in service. The adhesives shall be used for bonding aluminum alloy facing to foam core, inserts, edge attachments, and other components of a foam cored sandwich panel.
1.2 The values stated in SI units are to be regarded as the standard where only SI units are given or where SI units are given first followed by English units; where English units are given first followed by SI units, the English units are to be regarded as the standard.
1.3 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.
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: E 1794 – 00 An American National Standard
Standard Specification for
Adhesive for Bonding Foam Cored Sandwich Panels (200°F
Elevated Humidity Service), Type II Panels
This standard is issued under the fixed designation E 1794; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope tural, Metal to Metal QQ-A-250/11d Aluminum Alloy
6061T6, Plate and Sheet
1.1 This specification covers two-part adhesives for bonding
foam core sandwich panels. The adhesive may be used for new
3. Terminology
production or depot maintenance. The adhesive should be
3.1 Definitions—See Terminology E 1749 for definitions of
suitable for forming bonds that can withstand long-term
terms used in this specification.
exposure to temperatures from − 55 to 93°C (−67 to 200°F)
3.2 Definitions of Terms Specific to This Standard:
and also withstand combinations of stress, temperature, and
3.2.1 adhesive life—the maximum time that an adhesive,
humidity expected to be encountered in service. The adhesives
when mixed in a prescribed quantity can set at a designated
shall be used for bonding aluminum alloy facing to foam core,
temperature, after which the adhesive, when used to prepare
inserts, edge attachments, and other components of a foam
specimens, will deliver the required properties.
cored sandwich panel.
1.2 The values stated in SI units are to be regarded as the
4. Requirements
standard where only SI units are given or where SI units are
4.1 Material—The adhesive shall be a two-part thermoset-
given first followed by English units; where English units are
ting epoxy paste containing no asbestos and, when tested using
given first followed by SI units, the English units are to be
the test methods described in Section 6, shall meet the
regarded as the standard.
requirements of Section 4. The adhesive shall not have a
1.3 This standard does not purport to address all of the
deleterious effect on the components being bonded over the
safety concerns, if any, associated with its use. It is the
range of temperatures at which the adhesive will be used.
responsibility of the user of this standard to establish appro-
4.2 Working Characteristics:
priate safety and health practices and determine the applica-
4.2.1 Application—The adhesive shall be suitable for appli-
bility of regulatory limitations prior to use.
cation to facings and foam core materials. The adhesive shall
2. Referenced Documents be suitable for spray application to faying surfaces.
4.2.2 Curing—The time, temperature, and pressure used to
2.1 ASTM Standards:
cure the adhesive shall be within the range specified herein.
D 1002 Test Method for Apparent Shear Strength of Single-
4.2.2.1 Curing Time and Temperature—The adhesive, when
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
2 mixed in accordance with the manufacturer’s instructions, shall
sion Loading (Metal-to-Metal)
meet the requirements of this specification when cured at a
E 864 Practice for Surface Preparation of Aluminum Alloys
3 temperature of not more than 99°C (210°F) for 60 min, or
to be Adhesively Bonded in Honeycomb Shelter Panels
3 107°C (225°F) for 45 min. The timing of the cure shall start
E 1749 Terminology of Rigid Wall Relocatable Shelters
when the panel skins have reached the specified temperature.
2.2 Military Standard:
The temperature for the cure shall be fully attained within 3 h
MIL-STD-202F Test Methods for Electronic and Electrical
4 after the first application of the adhesive to the faying surface.
Component Parts
4.2.2.2 Curing Pressure—Specimens for testing under this
2.3 Federal Specification:
specification shall be cured under a normal load of 50 6 14 kPa
MMM-A-132 Adhesive, Heat Resistant, Airframe Struc-
(8.0 6 1.0 psi). No more than2hat 25°C (77°F) shall elapse
between the application of the adhesive to the faying surface
This specification is under the jurisdiction of ASTM Committee E06 on
and the application of the pressure.
Performance of Buildings and is the direct responsibility of Subcommittee E06.53
4.2.3 Mix Ratio—The mix ratio for the two parts of the
on Materials and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved Oct. 10, 2000. Published January 2001. Originally adhesive shall be as defined by the manufacturer.
published as E 1794 – 96.
4.3 Storage Life—The storage life shall not exceed one year
Annual Book of ASTM Standards, Vol 15.06.
from the date of manufacture, when the components of the
Annual Book of ASTM Standards, Vol 04.11.
adhesive are stored at a temperature between 10°C (50°F) and
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
E 1794
42°C (90°F). The adhesive shall be considered to have met this humidity and 93 6 3°C (200 6 5°F). Bring the specimen to
storage life requirement if all the characteristics described in temperature as indicated by a thermocouple at the bond area
4.1 and 4.5 are met by the adhesive after the one year storage and stabilize for 10 min just prior to test. Stabilize the chamber
period described above. used to test the specimens at temperature and humidity for 45
4.4 Adhesive Life—The adhesive life of one quart of the min prior to testing. Start the test of each humidity exposure
mixed adhesive at 25°C (77°F) shall not be less than 120 min test specimen no later than 30 min after removing it from the
(2 h), at which time the adhesive shall meet the requirements of humidity chamber.
4.5. 6.7 Salt Spray Exposure—Test specimens at 27 6 6°C (80
4.5 Mechanical Properties—The minimum mechanical 6 10°F) after exposure to the salt spray test of MIL-STD-202F
properties of the adhesives, when cured as specified, shall meet using a 20 % NaCl solution at 35 6 3°C (95 6 5°F). Stabilize
the requirements of Table 1. the specimens at the test temperature as indi
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