ASTM E1555-98
(Specification)Standard Specification for Structural Paste Adhesive for Sandwich Panel Repair
Standard Specification for Structural Paste Adhesive for Sandwich Panel Repair
SCOPE
1.1 This specification defines those characteristics that are required of adhesives to be used in the repair of sandwich panels for durable, rigidwall, relocatable shelters.
1.1.1 This specification covers two-part epoxy adhesive suitable for bonding aluminum alloy facings to nonmetallic core and core to core in the repair of durable rigidwall relocatable shelters. The adhesive shall be suitable for forming bonds that will withstand exposure to temperatures from -54 to 93°C (-65 to 199°F) and high relative humidity and will also withstand the combinations of stress, temperature, and relative humidity that are expected to be encountered in service. The adhesive shall also be suitable for the bonding of panel inserts and edge attachments.
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 inch-pound units; where inch-pound units are given first followed by SI units, the inch-pound units are to be regarded as the standard.
1.3 The following safety hazards caveat pertains only to the test methods described in this specification. 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
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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.
An American National Standard
Designation: E 1555 – 98
Standard Specification for
Structural Paste Adhesive for Sandwich Panel Repair
This standard is issued under the fixed designation E 1555; 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 E 864 Practice for Surface Preparation of Aluminum Alloys
to Be Adhesively Bonded in Honeycomb Shelter Panels
1.1 This specification defines those characteristics that are
E 1091 Specification for Nonmetallic Honeycomb Core for
required of adhesives to be used in the repair of sandwich
Use in Shelter Panels
panels for durable, rigidwall, relocatable structures.
2.2 Federal Specifications:
1.1.1 This specification covers two-part epoxy adhesive
QQ-A-250/8d Aluminum Alloy 5052 H34 Plate and Sheet
suitable for bonding aluminum alloy facings to nonmetallic
QQ-A-250/11d Aluminum Alloy 6061 T6 Plate and Sheet
core and core to core in the repair of durable rigidwall
MMM-A-132A Adhesives, Heat Resistant, Air Frame
relocatable structures. The adhesive shall be suitable for
Structural, Metal-to-Metal
forming bonds that will withstand exposure to temperatures
MIL-STD-401 Sandwich Constructions and Core Materials;
from −54 to 93°C (−65 to 199°F) and high relative humidity
General Test Methods
and will also withstand the combinations of stress, temperature,
and relative humidity that are expected to be encountered in
3. Material
service. The adhesive shall also be suitable for the bonding of
3.1 The adhesive shall be a two-part thermosetting epoxy
panel inserts and edge attachments.
paste containing no asbestos and when tested using the test
1.2 The values stated in SI units are to be regarded as the
methods described in Section 6, shall meet the requirements of
standard where only SI units are given, or where SI units are
Section 4. The adhesive shall not have a deleterious effect on
given first followed by inch-pound units; where inch-pound
the components being bonded over the range of temperatures at
units are given first followed by SI units, the inch-pound units
which the adhesive will be used.
are to be regarded as the standard.
1.3 The following safety hazards caveat pertains only to the
4. Physical Requirements
test methods described in this specification. This standard does
4.1 Working Characteristics:
not purport to address all of the safety concerns, if any,
4.1.1 Application—The adhesive shall be suitable for appli-
associated with its use. It is the responsibility of the user of this
cation to facings and core materials. The adhesive shall not drip
standard to establish appropriate safety and health practices
and shall not develop an overall average sag of 6.3 mm (0.25
and determine the applicability of regulatory limitations prior
in.) or more when tested in accordance with the procedures
to use.
described in 6.7.
4.1.2 Adhesive Life—The adhesive, when mixed in 1-qt kit
2. Referenced Documents
quantities in a standard quart paint can, allowed to sit for 30
2.1 ASTM Standards:
min at 23 6 3°C (73.4 6 5.4°F), and then used to prepare test
D 1002 Test Method for Apparent Shear Strength of Single-
specimens as prescribed in 6.1-6.3, shall still be able to deliver
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
2 the lap shear property levels listed in Table 1 for the 23°C
sion Loading (Metal-to-Metal)
temperature test condition.
D 1781 Test Method for Climbing Drum Peel for Adhe-
2 4.1.3 The adhesive, when mixed in a quart kit and allowed
sives
to stand in ambient still air, shall not, as a result of an
D 2919 Test Method for Determining Durability of Adhe-
2 exothermic reaction, heat itself to a temperature of 49°C
sive Joints Stressed in Shear by Tension Loading
3 (120°F) or above. This shall be performed in a chemical fume
E 4 Practices for Force Verification of Testing Machines
hood so that heat and any potentially toxic fumes that may be
released as a result of exothermic reaction are controlled. A
1 preliminary test, using a pint kit, shall be conducted to
This specification is under the jurisdiction of ASTM Committee E-6 on
determine if a potential problem exists.
Performance of Buildings and is the direct responsibility of Subcommittee E06.53
on Materials and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved April 10, 1998. Published August 1998. Originally
published as E 1555–93. Last previous edition E 1555–93a. Annual Book of ASTM Standards, Vol 04.11.
2 5
Annual Book of ASTM Standards, Vol 15.06. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Annual Book of ASTM Standards, Vol 03.01. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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.
E1555–98
TABLE 1 Tensile Lap Shear (Test Method D 1002) TABLE 3 Climbing Drum Peel (Method D 1781)
Number of Average Must Minimum Must Number of
A Minimum Must
Test Condition
B Test Condition Average Must Exceed
Specimens Exceed Exceed Specimens A
Exceed
to be to be
°C (°F) MPa (psi) MPa (psi) °C (°F) N-m/m (in.-lb/in.) N-m/m (in.-lb/in.)
Tested Tested
−54 6 3 (−65 6 5) 6 18 (4.04) 15.3 (3.4)
−54 6 3 (−65 6 5) 6 13.8 (2000) 11.7 (1700)
23 6 3 (73 6 5) 6 36 (8.08) 30.6 (6.8)
23 6 3 (73 6 5) 6 17.9 (2600) 15.2 (2200)
60 6 3 (140 6 5) 6 24 (6.06) 22.7 (5.1)
60 6 3 (140 6 5) 6 16.5 (2400) 14.1 (2050)
A
93 6 3 (199 6 5) 6 10.3 (1500) 8.6 (1250) All specimens tested must exceed these minimum values.
60 6 3 (140 6 5) 6 8.3 (1200) 7.0 (1020)
A
After 30 day exposure to 60 6 3°C (140 6 5°F) and 95 to 100 % relative
TABLE 4 Durability Test (Test Method D 2919)
humidity.
B Applied Stress Average
All specimens tested must exceed these minimum values.
Number of
Time to
Test Condition Specimens
MPa (psi) Failure to
to be Tested
Exceed
60 6 3°C (140 6 5°F) and 6 8.3 (1200) 400 h
4.1.4 Curing—The adhesive shall be capable of curing at 23
95 to 100 % R.H. 6 11.0 (1600) 50 h
6 3°C (73.4 6 5.4°F) in 7 days, or for no longer than3hat
a temperature of 60 to 66°C (140 to 150.8°F), with a curing
pressure not to exceed 14 psig. In a 23 6 3°C (73.4 6 5.4°F)
6. Test Methods
cure, the curing pressure shall also be a maximum of 14 psig
6.1 Preparation of Test Specimens—The adherends shall be
and shall only be required during the first 24 h of cure. In a 23
either 6061 T6 or 5052 H34 aluminum alloy and shall be
6 3°C (73.4 6 5.4°F) cure, the adhesive shall be capable of
cleaned as prescribed in Practice E 864.
developing 3.45 MPa (500 psi) lap shear strength, when tested
6.2 Apparatus—The testing machine shall conform to the
at 23°C temperature, within the first 24 h of cure.
requirements of Practices E 4. The load range shall be selected
4.1.5 Mix Ratio—The mix ratio for the two parts of the
so that the maximum loads for each type of test conducted falls
adhesive shall be defined by the manufacturer but shall be in
between 15 and 85 % of the full-scale capacity. Autographic
the range from 10:1 to 1:1 by weight.
equipment, or equipment that will produce equivalent accu-
4.2 Storage Life—The storage life of the two parts of the
racy, shall be used to record loads.
adhesive, from date of shipment, when stored in airtight
6.3 Lap-Shear Strength—The lap shear tests shall be per-
containers at 23 6 3°C (73.4 6 5.4°F)j, shall be at least 12
formed in accordance with Test Method D 1002 and at the test
months. The adhesive shall be considered to have met this
conditions listed in Table 1. In all tests the test chamber shall
storage life requirement if all the characteristics described in
be stabilized at the test temperature for 45 min prior to the test
4.1 and 4.3 are met by the adhesive after the 12-month storage
and before the specimens are placed in it.
period described above.
6.3.1 Reduced and Elevated Temperature Tests—For the
4.3 Mechanical Properties— The mechanical properties of
test to be conducted on specimens that have not been humidity-
the adhesive, when cured for3hat636 3°C (145.4 6 5.4°F)
aged, bring the specimens to the test temperature, as indicated
or 7 days at 23 6 3 °C (73.4 6 5.4°F) at a cure pressure not
by a thermocouple at the bond area, and stabilize for 10 min
to exceed 14 psig, shall meet the requirements of Tables 1-4.
just prior to test.
6.3.2 Elevated Temperature Test after Humidity Aging—The
5. Significance and Use
specimen shall be maintained in the humid environment until
5.1 Adhesives used in the repair of sandwich panels for
immediately before insertion into the test chamber. The speci-
durable, rigidwall, relocatable structures must have a combi-
men shall be inserted into the test chamber and the chamber
nation of mechanical property levels and environmental resis-
temperature returned to the test temperature as rapidly as
tance that will ensure long-term durability of the adhesive
possible to minimize specimen dryout. Based on the thermo-
bonds when exposed to severe climatic exposures. In addition,
couple located at the bond area, commence the test 2 min after
these adhesives must have processability characteristics that
the thermocouple returns to the test temperature.
permit their use in a variety of repair scenarios and environ-
6.4 Flatwise Tensile Strength—Sandwich specimens shall
ments.
be prepared using nonmetallic honeycomb core meeting the
5.2 This specification defines those characteristics that are
requirements of Specification E 1091, Type IV. The specimens
required of adhesives to be used in the repair of sandwich
2 2
shall have an area of 58 cm (9 in. ) and be tested in accordance
panels for durable, rigidwall, relocatable structures.
with the requirements in MIL-STD-401. The facing skins shall
be a minimum of 0.51 mm (0.020 in.) thick. The adhesive layer
between the facing skins and the honeycomb core shall be
TABLE 2 Flatwise Tension (Specification E 1091)
2 2
uniformly applied at a rate of 0.0488 gm/cm (0.1 lb/ft ).
Number of
Minimum Must
Test Condition Average Must Exceed 6.4.1 Reduced and Elevated Temperature Tests—Stabilize
A
Specimens
Exceed
to be
the chamber used to test the specimens at the test temperature
°C (°F) MPa (psi) M
...
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