ASTM E990-21

Standard Specification for Core-Splice Adhesive for Honeycomb Sandwich Structural Panels

ABSTRACT
This specification covers the requirements for core-splice adhesive for use with nonmetallic honeycomb cores in the fabrication of honeycomb sandwich panels used in relocatable structures. The adhesive shall be thermosetting, of film form, and capable of expanding to several times its original thickness and shall be cured at specific curing time, temperature, and pressure. Materials shall be tested for physical properties qualification which shall conform to water migration, volatility, expansion, sag, density, flexural shear strength or assembly compatibility, and tube shear or core splice integrity requirements. The adhesive shall be suitable for application to core material, edge members, and integral parts.
SCOPE
1.1 This specification covers core-splice adhesive for use with nonmetallic honeycomb cores in the fabrication of honeycomb sandwich panels used in relocatable structures. The adhesive shall be used for new production or depot repair. The adhesive shall be suitable for forming bonds that can withstand long combinations of stress, temperature, and relative humidity expected to be encountered in service. The adhesive shall be used for bonding core segments and for bonding core segments to edge members and to integral members in a honeycomb sandwich panel. The adhesive shall not allow the transfer of water from one part of the panel to another either through or along the line of the adhesive.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.3 The following precautionary caveat pertains only to the test method portion, Section 6, of 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Jan-2021
• ICS: 83.180 - Adhesives
• Technical Committee: E06 - Performance of Buildings
• Drafting Committee: E06.53 - Materials and Processes for Durable Rigidwall Relocatable Structures

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:E990 −21
Standard Specification for
Core-Splice Adhesive for Honeycomb Sandwich Structural
1
Panels
This standard is issued under the fixed designation E990; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers core-splice adhesive for use
with nonmetallic honeycomb cores in the fabrication of hon-
2. Referenced Documents
2
eycomb sandwich panels used in relocatable structures. The
2.1 ASTM Standards:
adhesive shall be used for new production or depot repair.The
B209Specification for Aluminum and Aluminum-Alloy
adhesiveshallbesuitableforformingbondsthatcanwithstand
Sheet and Plate
longcombinationsofstress,temperature,andrelativehumidity
C393/C393MTest Method for Core Shear Properties of
expected to be encountered in service. The adhesive shall be
Sandwich Constructions by Beam Flexure
usedforbondingcoresegmentsandforbondingcoresegments
D792Test Methods for Density and Specific Gravity (Rela-
to edge members and to integral members in a honeycomb
tive Density) of Plastics by Displacement
sandwich panel. The adhesive shall not allow the transfer of
E631Terminology of Building Constructions
water from one part of the panel to another either through or
E864Practice for Surface Preparation of Aluminum Alloys
along the line of the adhesive.
to Be Adhesively Bonded in Honeycomb Shelter Panels
E865Specification for Structural Film Adhesives for Hon-
1.2 The values stated in SI units are to be regarded as
eycomb Sandwich Panels
standard. The values given in parentheses after SI units are
E874Practice for Adhesive Bonding of Aluminum Facings
providedforinformationonlyandarenotconsideredstandard.
to Nonmetallic Honeycomb Core for Shelter Panels
1.3 The following precautionary caveat pertains only to the
E1091Specification for Nonmetallic Honeycomb Core for
test method portion, Section 6, of this specification: This
Use in Shelter Panels
standard does not purport to address all of the safety concerns,
E1749Terminology Relating to Rigid Wall Relocatable
if any, associated with its use. It is the responsibility of the user
Shelters
of this standard to establish appropriate safety, health, and
3
2.2 Federal Standards:
environmental practices and determine the applicability of
QQ-A-250/4Aluminum Alloy 2024, Plate and Sheet
regulatory limitations prior to use.
QQ-A-250/8dAluminum Alloy 5052H34, Plate and Sheet
1.4 This international standard was developed in accor-
QQ-A-250/11dAluminum Alloy 6061T6, Plate and Sheet
dance with internationally recognized principles on standard-
3
2.3 Military Standards:
ization established in the Decision on Principles for the
MIL-S-8802 Sealing Compound, Temperature-Resistant,
Development of International Standards, Guides and Recom-
Integral Fuel Tanks, and Fuel Cell Cavities, High-
Adhesion
1 2
This specification is under the jurisdiction of ASTM Committee E06 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Performance of Buildings and is the direct responsibility of Subcommittee E06.53 contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
on Materials and Processes for Durable Rigidwall Relocatable Structures. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Feb. 1, 2021. Published February 2021. Originally the ASTM website.
3
approved in 1984. Last previous edition approved in 2013 as E990–13. DOI: Available from DLA Document Services, Building 4/D, 700 Robbins Avenue,
10.1520/E0990-21. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil/.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E990−21
3. Terminology 5.3.2.2 Curing Pressure—The pressure required for curing
the adhesive shall be contact.
3.1 Definitions:
3.1.1 For definitions of general terms related to building 5.4 Storage Life—The adhesive shall have a minimum
construction used in this specification, refer to Terminology storage life of 3 months from the date of receipt at the
E631, and for general terms related to rigid wall relocatable fabricator facility when stored at−17.8°C (0°F) or below.
shelters, refer to Terminology
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E990 − 13 E990 − 21
Standard Specification for
Core-Splice Adhesive for Honeycomb Sandwich Structural
1
Panels
This standard is issued under the fixed designation E990; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification covers core-splice adhesive for use with nonmetallic honeycomb cores in the fabrication of honeycomb
sandwich panels used in relocatable structures. The adhesive shall be used for new production or depot repair. The adhesive shall
be suitable for forming bonds that can withstand long combinations of stress, temperature, and relative humidity expected to be
encountered in service. The adhesive shall be used for bonding core segments and for bonding core segments to edge members
and to integral members in a honeycomb sandwich panel. The adhesive shall not allow the transfer of water from one part of the
panel to another either through or along the line of the adhesive.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.after
SI units are provided for information only and are not considered standard.
1.3 The following precautionary caveat pertains only to the test method portion, Section 6, of 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 safety, health, and healthenvironmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
B209 Specification for Aluminum and Aluminum-Alloy Sheet and Plate
C393/C393M Test Method for Core Shear Properties of Sandwich Constructions by Beam Flexure
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
E631 Terminology of Building Constructions
E864 Practice for Surface Preparation of Aluminum Alloys to Be Adhesively Bonded in Honeycomb Shelter Panels
E865 Specification for Structural Film Adhesives for Honeycomb Sandwich Panels
E874 Practice for Adhesive Bonding of Aluminum Facings to Nonmetallic Honeycomb Core for Shelter Panels
E1091 Specification for Nonmetallic Honeycomb Core for Use in Shelter Panels
1
This specification is under the jurisdiction of ASTM Committee E06 on 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. 1, 2013Feb. 1, 2021. Published February 2014February 2021. Originally approved in 1984. Last previous edition approved in 20092013
as E990 – 09.E990 – 13. DOI: 10.1520/E0990-13.10.1520/E0990-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E990 − 21
E1749 Terminology Relating to Rigid Wall Relocatable Shelters
3
2.2 Federal Standards:
QQ-A-250/4 Aluminum Alloy 2024, Plate and Sheet
QQ-A-250/8d Aluminum Alloy 5052H34, Plate and Sheet
QQ-A-250/11d Aluminum Alloy 6061T6, Plate and Sheet
3
2.3 Military Standards:
MIL-S-8802 Sealing Compound, Temperature-Resistant, Integral Fuel Tanks, and Fuel Cell Cavities, High-Adhesion
3
Available from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, http://quicksearch.dla.mil/.
2

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E990 − 21
3. Terminology
3.1 DefinitionsDefinitions:—See
3.1.1 For definitions of general terms related to building construction used in this specification, r
...