ASTM_E_1794_-_13.pdf

Designation:E179413Standard 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 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 This 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 combinations 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 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 concerns,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 Aluminum-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 Shelter 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 E1749 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 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 components 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 time,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 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 Materials 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,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/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 cured under a normal load of 50 6 14 kPa(8.0 6 1.0 psi).No more than 2 h at 25C(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 thead