1、Designation: E1556 12Standard Specification forEpoxy Resin System for Composite Skin, HoneycombSandwich Panel Repair1This standard is issued under the fixed designation E1556; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 specification covers the re
3、quirements for an epoxyresin system intended for the repair of sandwich panels fordurable, rigidwall, relocatable structures. It must be usable in afield environment and shall not require the use of specialequipment such as autoclaves or presses. The epoxy systemcovered by this specification shall b
4、e usable for simultaneousimpregnation of a wet-layup composite skin and bonding ofthat skin to a substrate honeycomb core. The material shallwithstand exposure to temperatures from 54 to 93C (65 to199F) and high relative humidity, and also the combination ofstress, temperature, and relative humidity
5、 that are expected tobe encountered in service.1.2 The values stated in SI units are to be regarded asstandard 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 regard
6、ed as the standard.1.3 The following safety hazards caveat refers only to thetest methods described in this specification. This standard doesnot purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriat
7、e safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2C297/C297M Test Method for Flatwise Tensile Strength ofSandwich ConstructionsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastic
8、s by DisplacementD2344/D2344M Test Method for Short-Beam Strength ofPolymer Matrix Composite Materials andTheir LaminatesD2584 Test Method for Ignition Loss of Cured ReinforcedResinsD2734 Test Methods for Void Content of Reinforced PlasticsD3165 Test Method for Strength Properties of Adhesives inShe
9、ar by Tension Loading of Single-Lap-Joint LaminatedAssembliesE631 Terminology of Building ConstructionsE1091 Specification for Nonmetallic Honeycomb Core forUse in Shelter PanelsE1749 Terminology Relating to Rigid Wall RelocatableShelters2.2 Military Specifications:3MIL-I-24768 Insulation, Plastic,
10、Laminated, Thermosetting,Glass-Cloth, Epoxy-Resin2.3 Military Standards:3MIL-STD-129 Military Marking for Shipping and StorageMIL-STD-1916 DOD Preferred Methods for Acceptance ofProduct2.4 Commercial Standards:4SAE-AMS-C-9084 Cloth, Glass, Finished for Epoxy ResinLaminates3. Terminology3.1 Definitio
11、nsSee Terminologies E631 and E1749 fordefinitions of general terms used in this specification.4. Physical Requirements4.1 Working Characteristics:4.1.1 ApplicationThe components of the epoxy resin shallbe readily hand-mixed to a smooth consistency suitable forapplication. It shall be uniform and fre
12、e of lumps. The resincomponents, once mixed, shall not settle out. The epoxy1This 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.Cu
13、rrent edition approved Nov. 1, 2012. Published December 2012. Originallyapproved in 1993. Last previous edition approved in 2008 as E1556 08. DOI:10.1520/E1556-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
14、 of ASTMStandards volume information, refer to the standards 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.4Available from Society of Automotive Engine
15、ers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1material shall be suitable for the wet-layup impregnation ofSAE-AMS-C-9084 glass cloth and for application to
16、 corematerials over the temperature range of 16 to 38C (60 to100F) and at relative humidities of 30 to 75 %.4.1.2 Application LifeThe application life of a 200-g kit ofthe mixed epoxy system shall be at least 60 min when tested inaccordance with 4.1.5. The epoxy shall be considered to havereached th
17、e end of its application life when the viscosity of this200-g quantity of mixed adhesive exceeds 20 000 centipoise.4.1.3 CuringThe epoxy system shall be capable of curingat 23 6 2C (73 6 4F) in 7 days, or for no longer than3hata temperature of 60 to 66C (140 to 151F), with a curingpressure not to ex
18、ceed 14 psig. In a 236 3C cure, the curingpressure is not required to be maintained after the first 24 h. Ina236 2C cure, the epoxy material shall develop the propertylevels listed in Table 1 within the first 24 h of cure (see 8.3.5).In order to meet the requirements of this specification, theproper
19、ty levels listed in Tables 2-4 must be achieved with the7-day cure at 23 6 2C (73 6 4F).4.1.4 Storage LifeThe storage life period of the two partsof the epoxy resin system, when stored in airtight containers at23C (73F), shall be at least 12 months from the date ofshipment when tested in accordance
20、with 8.3.5.4.1.5 ViscosityThe viscosity of a 200-g kit of the mixedresin system shall be determined at 23 6 2C (73 6 4F) usinga Brookfield viscometer with a No. 3 spindle at 20 rpm. Aviscosity curve shall be determined by taking a readingimmediately after mixing, and every 5 min thereafter until the
21、viscosity exceeds 20 000 centipoise.The viscosity immediatelyafter mixing shall not exceed 14 000 centipoise.4.2 Mechanical PropertiesMechanical properties of testspecimens prepared and tested as specified in Section 8 shallmeet the respective requirements listed in Tables 2-4.4.3 Instruction SheetT
22、he manufacturer shall provide adated, coded, and titled instruction sheet outlining instructionsfor use of the epoxy system in impregnating and bondingSAE-AMS-C-9084 glass composite skins to honeycomb cores(Specification E1091, Types I or II). These instructions shall besupplied by the manufacturer
23、with the test report whenrequesting qualification (see 7.3) and also with each shipmentof epoxy material (see 10.2). The following information shallbe included:4.3.1 All of the information listed in 6.3.1-6.3.11.4.3.2 The application life of the mixed epoxy system at 236 2C (73 6 4F) and 38 6 2C (10
24、0 6 4F).4.3.3 Mixing instructions shall be stated in detail for theepoxy resin system in the particular container supplied.4.3.4 Application, impregnating, and curing instructions,including the spreading method, thickness range, andtemperature/relative humidity working limitations.4.3.5 Material Saf
25、ety Data Sheets and necessary safetyprecautions to be observed throughout all operations.4.3.6 Any other pertinent information relative to the use andstorage of the two-part system (resin and curing agent) package(see 10.2).5. Significance and Use5.1 Epoxy resin systems used in the repair of composi
26、te skinsandwich panels for durable, rigidwall, relocatable sheltersmust have a combination of mechanical property levels andenvironmental resistance that will assure long-term durabilityof the skins and the skin-to-core adhesive bonds when exposedto severe climatic exposures. In addition, these epox
27、y materialsmust have processability characteristics that permit their use ina variety of repair scenarios and environments.5.2 Intended UseEpoxy systems conforming to this speci-fication are intended for use in the repair of honeycomb panelsat the maintenance field level. The material is intended fo
28、r usewith SAE-AMS-C-9084 glass cloth.5.2.1 This is a procurement control document for theprocurement of the epoxy system and designers shall be awarethat the test values specified herein are based upon testsperformed with specific glass-resin composite adherends andshall not be used for design data.
29、5.2.2 Epoxy systems covered by this specification are notintended for use in production bonding of sandwich construc-tion.6. Material and Ordering Information6.1 General DescriptionThe material shall be a two-partthermosetting epoxy system containing no asbestos, whichshall not have a deleterious ef
30、fect on the components beingimpregnated and bonded. It shall have physical characteristicsthat meet the requirements of Sections 4 and 7.6.1.1 Formulation ChangesThe epoxy material shall beapproved only for the formulation that has passed the qualifi-cation tests and shall be used by the fabricator
31、as approved.Any changes by the manufacturer, such as the adding orchanging of pigments, hardeners, or fillers, or changes in thetype or method of manufacture, changes in formulation of thebasic resin, or any other changes, shall be cause for designatingthe adhesive as a new product that shall not be
32、 consideredapproved. The changed epoxy resin system shall be given anew code number and shall be resubmitted for approval underTABLE 1 Property Requirements for 24-h, 23C CureProperty Test ConditionNumber ofSpecimensAverage Must Exceed Minimum Must Exceed,AMPa (psi) MPa (psi)Tensile Lap Shear Streng
33、th in accordancewith 8.2.1, 8.3.123C (73F), dry 5 6.9 (1000) 5.85 (850)Apparent Horizontal Shear Strength inaccordance with 8.2.2, 8.3.223C (73F), dry 5 15.5 (2250) 13.15 (1910)AAll specimens tested must exceed these minimum values.E1556 122this specification.Anew instruction sheet for this reformul
34、atedmaterial shall be submitted by the manufacturer to the quali-fying activity for approval (see 4.3 and 11.2.2.3).6.1.2 Identification of ProductThe manufacturer shallidentify each epoxy resin system submitted under this specifi-cation according to the type of container furnished for it (seeSectio
35、n 10). In addition, the manufacturer shall designate eachepoxy system by a trade name and code number that shall beused to identify it.6.2 QualificationIn the case of epoxy systems for whichthe purchaser requires qualification, comprehensive testing inaccordance with Section 8 shall be performed and
36、 documentedin a test report.6.3 Procurement DocumentsProcurement documentsshall specify the following:6.3.1 Title, number, and date of this specification,6.3.2 Epoxy resin system type and manufacturers tradename,6.3.3 Date of manufacture,6.3.4 Manufacturers name and address,6.3.5 Manufacturers batch
37、/lot designation,6.3.6 Contract number,6.3.7 Date of shipment,6.3.8 Expiration dates when stored at 23 6 2C (73 6 4F),6.3.9 Manufacturers recommended storage temperature,6.3.10 Quantity required, and6.3.11 Manufacturers certification that the batch and lotmeet the requirements of this specification.
38、7. Quality Assurance Provisions7.1 Responsibility for InspectionUnless otherwise speci-fied in the contract or purchase order, the supplier is respon-sible for the performance of all inspection requirements asspecified herein. Except as otherwise specified in the contractor purchase order, the suppl
39、ier is permitted to use any facilitysuitable for the performance of the inspection requirementsspecified herein, unless disapproved by purchaser. The pur-chaser reserves the right to perform any of the inspections setforth in the specification where such inspections are required toensure that suppli
40、es and services conform to prescribed re-quirements.7.2 Classification of TestsThe inspection and testing of theepoxy system shall be classified as qualification tests (see 7.3)and quality conformance tests (see 7.4).7.3 Qualification Tests:7.3.1 Sampling Instruction:7.3.1.1 Epoxy Resin System Sampl
41、esThe manufacturershall submit two 1-qt samples of the base epoxy resin, alongwith the necessary curing agent, from a single-numberedproduction batch of material being presented for qualification.The manufacturer shall submit two additional 200-g kits of thetwo-part system (resin and curing agent) f
42、rom the sameproduction batch for storage life tests (8.3.4). These four 200-gkit epoxy resin samples shall each be from a batch of mostrecent production-scale manufacture, and are not required to befrom the same batch as that used in preparing the duplicatepanels specified in 7.3.1.3.All samples sha
43、ll be identified as to:(1) Name and address of manufacturer,(2) Manufacturers designation (trade name and codenumber),(3) Type of epoxy resin,(4) Batch number,(5) Date of manufacture,(6) Date of submittal,TABLE 2 Tensile Lap Shear Strength Requirements (See 8.3.1)Test ConditionNumber ofSpecimensAver
44、age Must Exceed Minimum Must Exceed,AMPa (psi) MPa (psi)40C (40F), dry 5 13.8 (2000) 11.7 (1700)23C (73F), dry 5 13.8 (2000) 11.7 (1700)93C (200F), wetB5 6.9 (1000) 5.9 (850)AAll specimens tested must exceed these minimum values.BWet = tested immediately after 30 days exposure to 60C (140F) and 95 t
45、o 100 % R.H.TABLE 3 Apparent Horizontal Shear Strength RequirementsTest ConditionNumber ofSpecimensAverage Must Exceed Minimum Must Exceed,AMPa (psi) MPa (psi)23C (73F), dry 5 31.0 (4500) 26.3 (3820)93C (200F), wetB5 13.8 (2000) 11.7 (1700)AAll specimens tested must exceed these minimum values.BWet
46、= tested immediately after 30 days exposure to 60C (140F) and 95 to 100 % R.H.TABLE 4 Flatwise Tensile Strength RequirementsTest ConditionNumber ofSpecimensAverage Must Exceed Minimum Must Exceed,AMPa (psi) MPa (psi)40C (40F), dry 5 2.8 (406) 2.4 (345)23C (73F), dry 5 2.8 (406) 2.4 (345)80C (176F),
47、wetB5 1.38 (200) 1.17 (170)AAll specimens tested must exceed these minimum values.BWet = tested immediately after 30 days exposure to 60C (140F) and 95 to 100 % R.H.E1556 123(7) Expiration date, and(8) Identification of agency submitting the samples.7.3.1.2 A statement indicating that the products h
48、ave notbeen rebranded shall accompany the samples. If rebranded, thenames of the original manufacturers and original designationsof the products shall be indicated. All information submittedwill be treated as confidential.7.3.1.3 Duplicate PanelsThe manufacturer shall submit,along with the epoxy mat
49、erial samples called for in 7.3.1.1,aset of three panels, prepared in accordance with the proceduresdescribed in 8.2.1-8.2.3, respectively. These three panels shallbe duplicates of those used in the generation of data for the testreport (7.3.2). These panels shall be prepared with epoxy resinsamples from the same numbered batch, and shall be codemarked the same as the panels from which the data in the testreport (7.3.2) were obtained.7.3.2 Test ReportA dated and numbered report, certifiedby notariz
