ASTM E1826-00
(Specification)Standard Specification for Low Volatile Organic Compound (VOC) Corrosion-Inhibiting Adhesive Primer for Aluminum Alloys to Be Adhesively Bonded
Standard Specification for Low Volatile Organic Compound (VOC) Corrosion-Inhibiting Adhesive Primer for Aluminum Alloys to Be Adhesively Bonded
SCOPE
1.1 This specification is for pigmented, sprayable, low volatile organic compound (VOC) corrosion-inhibiting adhesive primers for use on aluminum alloys that are to be adhesively bonded in the fabrication of panels for tactical shelters. When applied to a properly prepared surface of aluminum alloy, the primer imparts corrosion resistance and forms a surface suitable for structural bonding and for coating with shelter paint finishes.
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 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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An American National Standard
Designation: E 1826 – 00
Standard Specification for
Low Volatile Organic Compound (VOC) Corrosion-Inhibiting
Adhesive Primer for Aluminum Alloys to Be Adhesively
Bonded
This standard is issued under the fixed designation E1826; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope eycomb Sandwich Panels
E874 Practice forAdhesive Bonding ofAluminum Facings
1.1 This specification is for pigmented, sprayable, low
to Nonmetallic Honeycomb Core for Shelter Panels
volatile organic compound (VOC) corrosion-inhibiting adhe-
2.2 Federal Specifications:
sive primers for use on aluminum alloys that are to be
QQ-A-250/8d AluminumAlloy 5052 H34 Plate and Sheet
adhesively bonded in the fabrication of panels for tactical
QQ-A-250/11d Aluminum Alloy 6061 T6 Plate and Sheet
shelters. When applied to a properly prepared surface of
2.3 Government Document:
aluminum alloy, the primer imparts corrosion resistance and
Rule1124 Aerospace Assembly and Component Manufac-
forms a surface suitable for structural bonding and for coating
turing Operations, South Coast Air Quality Management
with shelter paint finishes.
District
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
3. Materials and Manufacturer
given first followed by inch-pound units; where inch-pound
3.1 The primer shall be a pigmented liquid composed of a
units are given first followed by SI units, the inch-pound units
modified epoxy phenolic or other resin system compounded to
are to be regarded as the standard.
be spray-applied to produce a continuous, uniform coating
1.3 This standard does not purport to address all of the
without dilution.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Physical Properties
priate safety and health practices and determine the applica-
4.1 The uncured primer shall be tested as specified in 5.1
bility of regulatory limitations prior to use.
and meet the requirement of Table 1.
4.2 Properties of Cured Film—When applied and cured in
2. Referenced Documents
accordance with 5.1.8, the cured film shall meet the require-
2.1 ASTM Standards:
2 mentsofTables2and3whentestedasspecifiedin5.2and5.3.
B117 Practice for Operating Salt Spray (Fog) Apparatus
4.3 Storage Stability—Primer stored in accordance with
D1002 TestMethodforApparentShearStrengthofSingle-
5.1.3 shall meet the requirements for normal- and low-
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
3 temperature floating roller peel in Table 3 when cured in
sion Loading (Metal-to-Metal)
accordancewith5.1.8andtestedasspecifiedin5.3.7and5.3.8.
D3167 Test Method for Floating Roller Peel Resistance of
3 4.4 Shelf Life—The shelf life of the primer at 25 6 7°C (77
Adhesives
612°F)shallbeatleastfourdays.Afterfourdays,whentested
E864 Practice for Surface Preparation ofAluminumAlloys
according to 5.1.4, the primer shall meet the requirements for
to be Adhesively Bonded in Honeycomb Shelter Panels
normal- and low-temperature floating roller peel in Table 3
E865 Specification for Structural FilmAdhesives for Hon-
when cured in accordance with 5.1.8 and tested as specified in
5.3.7 and 5.3.8.
1 4.5 FilmThickness—Theaverage,minimum,andmaximum
This specification is under the jurisdiction of ASTM Committee E06 on
film thicknesses shall be between 0.0025 and 0.010 mm
Performance of Buildings and is the direct responsibility of Subcommittee E06.53
on Materials and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved Oct. 10, 2000. Published Janurary 2001. Originally
published as E1826–96. Last previous edition E 1826–96. AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Annual Book of ASTM Standards, Vol 03.02. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
3 6
Annual Book of ASTM Standards, Vol 15.06. Available from South Coast Air Quality Management District, 9150 Flair Dr.,
Annual Book of ASTM Standards, Vol 04.11. El Monte, CA 91731.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1826–00
TABLE 1 Physical Properties of Uncured Liquid Polymer
meet the requirements for normal- and low-temperature float-
Test Requirement ing roller peel in Table 3 when cured in accordance with 5.1.8
and tested as specified in 5.3.7 and 5.3.8.
Solids content,% Report only
Ash content, % Report only
5.1.4 Shelf Life—Store a sample of the primer for four days
Color Easily visible film
at 25 6 7°C (77 6 13°F). The aged sample shall meet the
VOC content 250 g/L max
requirements for normal- and low-temperature floating roller
peel inTable 3 when cured in accordance with 5.1.8 and tested
as specified in 5.3.7 and 5.3.8.
TABLE 2 Physical Property of Cured Film on Primed Surfaces
5.1.5 Film Thickness—The cured primer film thickness
Test Requirement
Smooth uniform coating 0.0025 to 0.010 mm (0.0001 to 0.0004
shallbedeterminedwithaeddy-currentinstrumentasspecified
in.)6 15 % coefficient of variation
in 5.2.2.
5.1.6 Color—During spray application, there shall be a
discernible color change for the primer thickness specified in
TABLE 3 Physical Properties of Bonded Specimens
4.5.
Requirements
Test
5.1.7 Sprayability—The primer shall be capable of being
(min)
readily applied in accordance with the manufacturer’s instruc-
Normal-temperature lap shear, 24°C (77°F), MPa (psi) 20.0 (2903)
Low-temperature lap shear, −55°C (−67°F), MPa (psi) 20.0 (2903) tionstoalltestpanelsofeither6061T6or5052H34aluminum
High-temperature lap shear, 93°C (200°F), MPa (psi) 13.0 (1890)
alloy (Fed. Spec. QQ-A-250/11d or QQ-A-250/8d, respec-
Humidity exposure lap shear, 93°C (200°F), MPa (psi) 8.0 (1161)
tively) and cleaned in accordance with Practice E864 for each
Salt spray exposure lap shear, 35°C (95°F), MPa (psi) 16.0 (2322)
of the tests described in 5.1.8-5.3.8.
Normal-temperature floating roller peel strength, 24°C (75°F), 4400 (25.1)
N/m (lbf/in.)
5.1.8 Curing Properties—Test the cured film for the ability
Low-temperature floating roller peel strength, −55°C (−67°F), 2625 (15.0)
to meet the requirements listed in Tables 2 and 3. Spray the
N/m (lbf/in.)
primer onto the test panels and air dry at least 20 min at 24 6
5°C (77 6 9°F); then heat in air for 65 6 5 min at 121 6 5°C
(250 6 9°F).
(0.0001 and 0.0004 in.) 615% coefficient of variation. At
5.1.9 VOC Content—The grams ofVOC per litre of primer,
least five thickness readings shall be made with no more than
2 2 less water and exempt compounds per Rule1124, shall be
one in any 645 mm (1 in. ) area.
determinedbytheadhesiveprimermanufacturerinaccordance
4.6 VOC Content—The volatile organic compound (VOC)
with Rule1124 and meet the requirement for VOC content in
is any volatile compound containing the element of carbon,
Table 1.
excluding methane, carbon monoxide, carbon dioxide, car-
5.2 Cured Film:
bonic acid, metallic carbides or carbonates, and ammonium
5.2.1 Test Panels and Panel Preparation—Testpanelsshall
carbonates, as stated in Rule1124. The VOC content shall
be either 6061 T6 or 5052 H34 bare aluminum alloy (Fed.
meet the requirement in Table 1 when determined in accor-
Spec. QQ-A-250/11d or QQ-A-250/8d, respectively) and
dance with 5.1.9.
cleaned in accordance with Practice E864.
5.2.2 Smooth Uniform Coating—Clean a 30 by 30 cm (12
5. Test Methods
by12in.)panel,spraytoaprimerthicknessasspecifiedin4.5,
5.1 Uncured Primer:
and cure as specified in 5.1.8. Determine the primer thickness
5.1.1 Solids Content—Determinethesolidscontentbyheat-
with a Fisher isoscope MP2-T3.3B (or equivalent) calibrated
inga2-gsampleofthoroughlymixedprimerinanignition-loss
with standards between 0.0025 and 0.010 mm (0.0001 and
cruciblewithcoverat121 65°C(250 69°F)fornotlessthan
0.0004 in.). The primer thickness shall meet the requirements
90 min. Cool the crucible to room temperature in a desiccator.
in 4.5 and Table 2.
Weighings before and after heating shall be accurate to 6
5.2.3 Pencil Hardness—Determine the pencil hardness of
0.001g.Calculatethemassofsolidsremainingasapercentage
the cured film using the following procedure:
of the initial sample mass as follows:
5.2.3.1 Preparation of Pencils—Prepare a set of drawing
massofnonvolatileresidue
Percentsolidscontent 5 3100 (1)
pencils ranging in hardness from 6B to 5H by stripping the
initialsamplemass
woodawayfromtheendapproximately10mm( ⁄8in.)without
5.1.2 Ash Content—Place the crucibles containing the sol-
damaging the lead. Square the tip of the lead by holding the
ids content samples in a furnace at 565 6 28°C (1050 6 82°F)
pencilinaverticalpositionandmovingtheleadbackandforth
fornotlessthan60min.Coolthecrucibletoroomtemperature
over 400-grit or finer abrasive paper. Square the tip of the lead
in a desiccator. Weighings before and after heating shall be
after each trial.
accurate to 6 0.001 g. Calculate the ash content remaining as
5.2.3.2 Procedure—Place a test panel with the cured primer
a percentage of the solids content as follows:
applied in a horizontal position. Push pencils of increasing
massofashresidue
hardnessata45°angleintothecoatedsurfaceofthepaneluntil
Percentashcontent 5 3100 (2)
massofnonvolatileresidue
one is found that will cut or scratch the coating. Use the
number of this pencil to express the primer hardness.
5.1.3 Storage Stability—Store a sample of the primer for
three months from the date of manufacture at a temperature 5.2.4 Environmental Resistance Test— Clean three test
recommended by the manufacturer. The stored sample shall panels for each test described in 5.2.5-5.2.7 approximately 76
E1826–00
by 127 mm (3 by 5 in.) in accordance with 5.2.1. Apply the specimen to−55 6 3°C (−66 6 5°F) as indicated by a
primer and cure in accordance with 4.5 and 5.1.8. The primed thermocouple at the bond area and stabilize for 10 min prior to
panels shall be subjected to the environments specified in test. The test chamber used to test the specimens shall be
5.2.5-5.2.7 and there shall be no cracking, no blistering, and a stabilized at the test temperature for at least 45 min prior to
minimum pencil hardness of 4H. testing.
5.2.5 Water Resistance—Immerse the
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