1、Designation: E1794 13Standard Specification forAdhesive for Bonding Foam Cored Sandwich Panels (200FElevated Humidity Service), Type II Panels1This standard is issued under the fixed designation E1794; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 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 U.S. Department of Defense.1. Scope1.1 T
3、his 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 combi
4、nations 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
5、regarded 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 conce
6、rns, 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:2B209 Specification for Aluminum and Alum
7、inum-AlloySheet and PlateD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)E631 Terminology of Building ConstructionsE864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shel
8、ter PanelsE1749 Terminology Relating to Rigid 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 Terminologies E631 and E17
9、49 fordefinitions of terms used in this specification.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
10、the required properties.4. Requirements4.1 MaterialThe 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 compone
11、nts being bonded over therange of temperatures at which 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 ti
12、me, temperature, and pressure used tocure the adhesive 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
13、 99C (210F) for 60 min, or107C (225F) for 45 min. The timing of the cure shall startwhen the panel skins have reached the specified temperature.1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.53on Mat
14、erials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved Oct. 1, 2013. Published February 2014. Originallyapproved in 1996. Last previous edition approved in 2008 as E1794 08. DOI:10.1520/E1794-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
15、 orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from DLA Document Services, Building 4/D, 700 Robbins Avenue,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil/.Co
16、pyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1The 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 thisspec
17、ification shall be cured under a normal load of 50 6 14 kPa(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
18、manufacturer.4.3 Storage LifeThe storage life 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 des
19、cribed in4.1 and 4.5 are met by the adhesive after 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 PropertiesT
20、he minimum mechanicalproperties of the adhesives, 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 produc
21、tion bonding ofaluminum alloys to foam core materials for the manufacture oftactical shelters.6. Test Methods6.1 Qualification TestsFor qualification, the adhesive shallbe tested using the tests described in this section. Shear testsshall be performed in accordance with Test Method D1002except that
22、the length of the test coupon shall be 103.7 mm (414in.) and the thickness shall be 2.196 mm (0.090 in.).6.2 Preparation of Test SpecimensPrepare at least tenspecimens for each separate test. The metal to be bonded shallbe 6061 T6 (Federal Specification QQ-A-250/11d or Specifi-cation B209) and clean
23、ed as specified in Practice E864. Time,temperature, and pressure for curing the adhesive shall be asspecified in 4.2.2.1 and 4.2.2.2.6.3 Room Temperature ShearSubject specimens to a ten-sile shear test at a room temperature of 27 6 6C (80 6 10F).6.4 Low Temperature ShearTest specimens at 54 6 3C(65
24、6 5F). Bring the specimens to temperature as indicatedby a thermocouple at the bond area and stabilize for 10 6 1min just prior to test. Stabilize the chamber used to test thespecimens at the test temperature for 45 min prior to testing.6.5 High Temperature ShearTest specimens at93 + 0, 3C (200 + 0,
25、 5F). Bring the specimens to tempera-ture as indicated by a thermocouple at the bond area andstabilize for 10 min just prior to test. Stabilize the chamberused to test the specimens at the test temperature for 45 minprior to testing.6.6 Humidity ExposureTest lap shear specimens at 93 63C (200 6 5F)
26、after 2 weeks exposure to 100 % relativehumidity and 93 6 3C (200 6 5F). Bring the specimen totemperature as indicated by a thermocouple at the bond areaand stabilize for 10 min just prior to test. Stabilize the chamberused to test the specimens at temperature and humidity for 45min prior to testing
27、. Start the test of each humidity exposuretest specimen no later than 30 min after removing it from thehumidity chamber.6.7 Salt Spray ExposureTest specimens at 27 6 6C (806 10F) after exposure to the salt spray test of MIL-STD-202Fusing a 20 % NaCl solution at 35 6 3C (95 6 5F). Stabilizethe specim
28、ens at the test temperature as indicated by athermocouple at the bond area for 10 min just prior to test.7. Inspection7.1 Qualification InspectionThe inspection requirementsspecified herein are classified as follows:7.1.1 Qualification TestUnless otherwise specified by thepurchaser, adhesives that h
29、ave not passed the qualificationtests, or that have previously passed the tests but havesubsequently been modified in any manner, shall be testedagainst this specification and shown to meet its requirements.7.1.1.1 Instruction SheetA dated, coded, and titled in-struction sheet that outlines instruct
30、ion for use of the adhesiveon bonding metal facings to foam core and metal componentsshall be supplied by the manufacturer. These instructions shallbe forwarded with the test report when requesting qualification.In addition, a copy of the instruction sheet shall accompanyeach shipment of the adhesiv
31、e.7.1.2 Reevaluation ProcedureIn the event that two ormore test results should fall below the minimum specified forany of the qualification tests, the submitted product shall beconsidered to have failed qualification testing. In this case, thelot along with two additional lots may be retested for th
32、at test.If all of these pass, the product will be considered as beingqualified.7.2 Quality Conformance InspectionThe number of testspecimens for conformance testing shall be five. The testprocedure, cure of the adhesive, and surface preparation shallbe in accordance with 6.2.7.2.1 TestsSamples of ea
33、ch lot of adhesive delivered oncontract of order shall be subjected to the following qualityconformance tests. Test reports, in duplicate, shall be furnishedfor all quality conformance tests specified in this specification,and shall be signed by an authorized representative of thelaboratory making t
34、he tests. Acceptance or approval of mate-rials during the course of manufacture shall not be construed asa guarantee of acceptance of the finished product.TABLE 1 Physical Property RequirementsTest RequirementRoom temperature, shear 2000 psi, min, 13.8 MPaLow temperature, shear 2000 psi, min, 13.8 M
35、PaHigh temperature, shear 1500 psi, min, 10.3 MPaHumidity exposure, shear, hot 1500 psi, min, 10.3 MPaSalt spray exposure, shear, RT 2000 psi, min, 13.8 MPaE1794 1327.2.2 Room Temperature Shear (Acceptance)The roomtemperature shear strength test shall be conducted in accor-dance with 6.3 using 6061
36、T6 aluminum alloy.7.2.3 High Temperature Shear (Acceptance)The hightemperature shear test shall be conducted in accordance with6.3 using 6061 T6 aluminum alloy.8. Packaging and Package Marking8.1 PackagingPackaging shall be in accordance with thesuppliers standard practices and applicable regulation
37、. Theproduct shall be clearly and legibly labeled with the followinginformation:8.1.1 Specification number,8.1.2 Date of manufacture (month and year),8.1.3 Manufacturers name and address,8.1.4 Manufacturers product designation,8.1.5 Manufacturers batch and lot designation,8.1.6 Contract number,8.1.7
38、 Expiration date,8.1.8 Manufacturers recommended storage temperaturerange, and8.1.9 Quantity contained.9. Keywords9.1 adhesive; elevated humidity; foam and beamASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stan
39、dard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be revie
40、wed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsibl
41、e technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
42、shohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E1794 133
