ASTM E1794-2008 Standard Specification for Adhesive for Bonding Foam Cored Sandwich Panels (200 F Elevated Humidity Service).pdf
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1、Designation: E 1794 08Standard Specification forAdhesive for Bonding Foam Cored Sandwich Panels (200FElevated Humidity Service), Type II Panels1This standard is issued under the fixed designation E 1794; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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. Scope1.1 This
3、 specification covers two-part adhesives for bondingfoam core sandwich panels. The adhesive may be used for newproduction or depot maintenance. The adhesive should besuitable for forming bonds that can withstand long-termexposure to temperatures from 55 to 93C (67 to 200F) andalso withstand combinat
4、ions of stress, temperature, and humid-ity expected to be encountered in service. The adhesives shallbe used for bonding aluminum alloy facing to foam core,inserts, internal aluminum framing members, and other com-ponents of a foam cored sandwich panel.1.2 The values stated in SI units are to be reg
5、arded as thestandard where only SI units are given or where SI units aregiven first followed by inch-pound units; where inch-poundunits are given first followed by SI units, the inch-pound unitsare to be regarded as the standard.1.3 This standard does not purport to address all of thesafety concerns
6、, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 209 Specification for Aluminum and Alumin
7、um-AlloySheet and PlateD 1002 Test Method forApparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)E 864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter PanelsE 1749 Terminology Relating to Ri
8、gid Wall RelocatableShelters2.2 Military Standard:3MIL-STD-202F Test Methods for Electronic and ElectricalComponent Parts2.3 Federal Specification:3QQ-A-250/11d Aluminum Alloy 6061 T6 Plate and Sheet3. Terminology3.1 DefinitionsSee Terminology E 1749 for definitions ofterms used in this specificatio
9、n.3.2 Definitions of Terms Specific to This Standard:3.2.1 adhesive lifethe maximum time that an adhesive,when mixed in a prescribed quantity can set at a designatedtemperature, after which the adhesive, when used to preparespecimens, will deliver the required properties.4. Requirements4.1 MaterialT
10、he adhesive shall be a two-part thermoset-ting epoxy paste containing no asbestos and, when tested usingthe test methods described in Section 6, shall meet therequirements of Section 4. The adhesive shall not have adeleterious effect on the components being bonded over therange of temperatures at wh
11、ich the adhesive will be used.4.2 Working Characteristics:4.2.1 ApplicationThe adhesive shall be suitable for appli-cation to facings and foam core materials. The adhesive shallbe suitable for spray application to faying surfaces.4.2.2 CuringThe time, temperature, and pressure used tocure the adhesi
12、ve shall be within the range specified herein.4.2.2.1 Curing Time and TemperatureThe adhesive, whenmixed in accordance with the manufacturers instructions, shallmeet the requirements of this specification when cured at atemperature of not more than 99C (210F) for 60 min, or107C (225F) for 45 min. Th
13、e timing of the cure shall startwhen the panel skins have reached the specified temperature.The temperature for the cure shall be fully attained within 3 hafter the first application of the adhesive to the faying surface.4.2.2.2 Curing PressureSpecimens for testing under thisspecification shall be c
14、ured under a normal load of 50 6 14 kPa1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.53on Materials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved Nov. 1, 2008.
15、Published December 2008. Originallyapproved in 1996. Last previous edition approved in 2003 as E 1794 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standar
16、ds Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, U
17、nited States.(8.0 6 1.0 psi). No more than2hat25C (77F) shall elapsebetween the application of the adhesive to the faying surfaceand the application of the pressure.4.2.3 Mix RatioThe mix ratio for the two parts of theadhesive shall be as defined by the manufacturer.4.3 Storage LifeThe storage life
18、shall not exceed one yearfrom the date of manufacture, when the components of theadhesive are stored at a temperature between 10C (50F) and42C (90F). The adhesive shall be considered to have met thisstorage life requirement if all the characteristics described in4.1 and 4.5 are met by the adhesive a
19、fter the one year storageperiod described above.4.4 Adhesive LifeThe adhesive life of one quart of themixed adhesive at 25C (77F) shall not be less than 120 min(2 h), at which time the adhesive shall meet the requirements of4.5.4.5 Mechanical PropertiesThe minimum mechanicalproperties of the adhesiv
20、es, when cured as specified, shall meetthe requirements of Table 1.5. Significance and Use5.1 This specification is intended to provide information onthe properties of adhesives, and the test methods required toevaluate adhesives to be used in the production bonding ofaluminum alloys to foam core ma
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