1、Designation: D6412/D6412M 99 (Reapproved 2012)Standard Specification ForEpoxy (Flexible) Adhesive For Bonding Metallic AndNonmetallic Materials1This standard is issued under the fixed designation D6412/D6412M; the number immediately following the designation indicates theyear of original adoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 The specification covers a two-part modified epoxypaste adhesive for bonding me
3、tallic and nonmetallic materials.The adhesive should be suitable for forming bonds that canwithstand environmental exposure to temperatures from 184to 82 C (300 to 180 F) when exposed to an expectedcombination of stress, temperature, and relative humidity to beencountered in service.NOTE 1When coord
4、inated through the Department of Defense (DoD)and the National Aeronautics and Space Administration (NASA), thispractice will be a direct replacement of MIL-A-82720 (OS), MIS-26872,and MSFC-SPEC-2037.1.2 The values stated in SI units or inch-pound units are tobe regarded separately as standard. With
5、in the text, theinch-pound units are shown in brackets. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other. Combining valuesfrom the two systems may result in nonconformance with thisspecification.1.3 The following precautionary s
6、tatement pertains to thetest method portion only, Section 8, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determ
7、ine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel, Strip, Carbon (0.25Maximum Percent), Cold-RolledA167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate, Sheet, and StripB209 Specificat
8、ion for Aluminum and Aluminum-AlloySheet and PlateD907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D1876 Test Method for Peel Resistance of Adhesives (T-Peel Test)D2240 Test Method for
9、 Rubber PropertyDurometer Hard-nessD2393 Test Method for Viscosity of Epoxy Resins andRelated Components (Withdrawn 1992)3D2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingD3951 Practice for Commercial PackagingD4142 Guide for Testing Epoxy ResinsE595 Test Method for Total Mass Loss an
10、d Collected Vola-tile Condensable Materials from Outgassing in a VacuumEnvironment2.2 National Aeronautics and Space Administration(NASA):4JSC Sp-R-0022 General Specification, Vacuum Stability Re-quirement of Polymeric Material for Spacecraft Applica-tionMSFC-HDBK-527/JSC-09604 Material Selection Li
11、st forHardware SystemsGSFC RP 1124 Outgassing Data for Selecting SpacecraftMaterialsNOTE 2Copies of specifications, standards, drawings and publicationsrequired by suppliers in connection with specific purchases should beobtained from the purchaser or as directed by his contracting officer.3. Termin
12、ology3.1 DefinitionsMany terms in this specification are de-fined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of subcommittee D14.80 on MetalBonding Adhesives.C
13、urrent edition approved Oct. 1, 2012. Published October 2012. Originallyapproved in 1999. Last previous edition approved in 2005 as D6412/D6412M - 99(2005). DOI: 10.1520/D6412_D6412M-99R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servic
14、eastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Unless otherwise indicated, copies of the above documents are available fromant NASA in
15、stallation library or document repository.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 epoxy-polyamide high viscosity adhesive, nan epoxypaste base (B) and a modified amide paste accelerator (A)when mixed in a proper ratio re
16、sults in a viscous paste.3.2.2 epoxy-polyamide low viscosity adhesive, nan epoxyliquid base (B) and a modified amide liquid accelerator (A)when mixed in a proper ratio results in a viscous liquid.4. Significance and Use4.1 GeneralThis specification provides testing proceduresand specimen requirement
17、s to differentiate between the physi-cal and adhesive bonding properties of two types of epoxy-polyamide adhesive.5. Classification5.1 The epoxy-polyamide adhesive shall be furnished as oneof the following types:5.1.1 Type IConsists of two-part kits of Part B, base andPart A, accelerator.5.1.1.1 Gra
18、de 1The high viscosity adhesive system iscomposed of an epoxy base (B) and a modified polyamideaccelerator (A).5.1.1.2 Grade 2The low viscosity adhesive system iscomposed of an epoxy liquid base (B) and a modified poly-amide liquid accelerator (A).5.1.2 Type IIConsists of premixed, frozen, Type I, G
19、rade1 or Type I, Grade 2.6. Ordering Information6.1 Procurement DocumentsPurchasers may select any ofthe desired options offered herein and the procurement docu-ments should specify the following:6.1.1 Title, number and dated revision letter of thisspecification,6.1.2 Adhesive type and grade numbers
20、,6.1.3 Amounts and unit quantities of adhesive required,6.1.4 Curing conditions,6.1.5 Level of Packaging and packing required, and6.1.6 Whether or not qualification (see 6.2) is necessary.6.2 QualificationIn the case the adhesives for which thepurchaser requires qualification, the procurement docume
21、ntsshould state that the awards will be made only for adhesivesthat are qualified at the time set for opening of bids.7. Test Requirements7.1 MaterialThe adhesive shall be thermosetting and,when tested using the tests described in Section 8 shall meetthe strength requirements of this specification.
22、The adhesiveshall not have a detrimental effect on the surfaces being bondedover the range of temperatures at which the adhesives will beused.7.2 QualificationThe adhesive shall be qualified at thetime for opening of bids. The qualification shall only apply tothe formulation on which the qualificati
23、on tests have beenmade (see 6.2). Any changes by the manufacturer in formula-tion or in the method of manufacturing, shall be cause ofdesignating the adhesive as a new product.7.3 ProcessingMethods of specimen surface preparation,that is, cleaning and etching adherends, cure time, temperatureand pre
24、ssure shall be in accordance with the manufacturersrecommendation.7.4 The physical, mechanical and outgassing properties ofthe adhesive shall meet the requirements specified in Table 1.Although, it is not listed in Table 1, Type II materials shall meetthe same requirements as Type I materials.8. Tes
25、t Methods8.1 Qualification TestsFor qualification, the adhesive shallbe tested using the tests described in this section. Test methodsand requirements are included in Table 1.8.2 Preparation of Test Specimens:8.2.1 Tensile Shear:8.2.1.1 AdherendThe metal bonded shall be 6061-T6 or2024-T3 aluminum al
26、loy.NOTE 3The use of steel substrates for the evaluation and lotacceptance of the material is optional at the discretion of the procuringagency. Use Specification A109/A109M Grade 2 Steel or SpecificationA167, Type 302 corrosion resistant steel.8.2.1.2 Surface TreatmentAdherend surfaces shall beclea
27、ned and etched in accordance with Guide D2651.8.2.1.3 CureCure time, temperature and pressure shall bein accordance with the adhesive manufacturers recommenda-tion.NOTE 4Test panels or specimens, or both, other than the breakawaytype shall be cut in such a manner that minimum vibration or heat isgen
28、erated during the cutting operation.NOTE 5Adhesive bondline thickness for tensile shear specimens shallbe 0.05 to 0.13 mm 0.002 in. to 0.005 in. and 0.25 to 0.43 mm 0.010 to0.017 in. for T-Peel specimens. Control of bondline thickness shall beaccomplished by placing two lengths of appropriate diamet
29、er stainlesswire 0.13 mm for tensile shear and 0.43 mm for T-Peel in the lengthwisedirection on the specimen bond area during the adhesive bondingoperation; the use of the same diameter glass beads approximately 0.5 %by weight, thoroughly mixed in the adhesive may also be used to maintainuniform bon
30、dine thickness.8.2.2 Hardness specimens shall be prepared using a mixtureof resin and catalyst for Type I Grades 1 or 2 in the ratiosspecified by the manufacturer or Type II premixed. Pour thethoroughly mixed material into an aluminum foil cup approxi-mately 7.6 cm 3.0 in. in diameter to a minimum t
31、hickness of6.3 mm 0.25 in.; cure per manufacturers recommendation.8.3 Test Procedures:8.3.1 Room-Temperature Tensile ShearSubject at leastfive specimens to a tensile shear test at normal temperature 256 3C 77 6 5F in accordance with Test Method D1002.8.3.2 High-Temperature Tensile ShearTest at least
32、 fivespecimens at 60 6 3C 140 6 5F and 82 6 3C 180 6 5Fin accordance with Test Method D1002. Bring the specimen totemperature as indicated by a temperature at the bondline andstabilize for 10 min. Stabilize the chamber at the test tempera-ture for 45 min prior to testing.8.3.3 Low-Temperature Tensil
33、e ShearTest at least fivespecimens at 55 6 3C 67 6 5F in accordance with TestMethod D1002. Bring the specimen to temperature as indicatedD6412/D6412M 99 (2012)2by a thermocouple at the bondline and stabilize for 10 min.Stabilize the chamber at the test temperature for 45 min priorto testing.8.3.4 Ro
34、om-Temperature T-PeelTest at least five speci-mens in accordance with Test Method D1876 constructed from2024-T3 alclad aluminum alloy or 6061-T6 aluminum 0.8 mm0.032 in. thick. T-peel specimens shall be etched in accor-dance with Guide D2651.8.3.5 Room-Temperature Shore D HardnessConduct atleast ten
35、 Shore hardness readings as required. Test in accor-dance with Test Method D2240 at 25 6 3C 77 6 5F.8.3.6 Outgassing RequirementsOutgassing shall meet therequirements of National Aeronautics and Space Administra-tion (NASA) specification SP-R-0022 tested in accordancewith Test Method E595.9. Inspect
36、ion9.1 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 supplier may use his own or any o
37、therfacility suitable for the performance of inspection requirementspecified herein. The purchaser has the right to perform any ofthe inspections set forth in this specification where suchinspections are deemed necessary to assure compliance withthe requirements.9.2 Classification of InspectionsThe
38、inspection require-ments are classified as follows:9.2.1 Qualification inspection (see 9.3), and9.2.2 Quality conformance inspection (see 9.4).9.3 Qualification Inspection:9.3.1 Qualification TestUnless otherwise specified by thepurchaser, adhesives that have not passed the qualificationtests, must
39、be tested against this specification and proved tomeet all its specified requirements.9.3.1.1 At the option of the purchaser qualification tests maybe performed at any time.9.3.1.2 Data SheetA dated, coded, and titled data sheetstating the adhesive material property data and instructions formixing,
40、curing, application, handling, storage and shelf lifeshall be supplied by the manufacturer upon the initial purchaseorder. Reorders of the same material do not require a duplicatecopy of the data sheet unless otherwise requested. The datasheet shall be forwarded along with the test report (see 9.3.2
41、)when requesting qualification.TABLE 1 Property Requirements for the Epoxy (Flexible) AdhesiveTestATestMethodRequirementType I, Grade 1 Type I, Grade 2Uncured PropertyResin Weight, kg/liter (lb/gal)Part A 1.26 10.5-1.32 11.0 0.96 8.0-1.02 8.5Part B 1.33 11.1-1.39 11.6 1.13 9.4-1.17 9.8Viscosity, CPS
42、 25 3C 77 5F D2393Part A 40 000-80 000 20 rpm min 5000-9000 20 RPMPart B 75 000-150 000 20 rpm min 1100-1500 20 RPMCured PropertyType I, Grade 1Cured at 25 3C 77 5F for 7 days,or2h663C1505F,or 30 min 93 3C 200 5FType I, Grade 2Cured at 25 3C 77 5F for 30 days,or 4 h at 66 3C 150 5F,or 30 min 93 3C 2
43、00 5FRoom-Temperature Shear, MPa psi25 3C 77 5FD100217.2 2500 min 8.2 1200 minHigh-Temperature Shear, MPa psi82 3C 180 5FD10022.8 400 1.42 200Low-Temperature Shear, MPa psi55 3C 67 5FD100220.7 3000 20.7 3000Room-Temperature T-Peel, Kg/m lb/in.25 3C 77 5FD1876466 25 446 25Room-Temperature Shore D Har
44、dness25 3C 77 5FD224050 40Outgassing Characteristics E595Total mass Loss (TML), % #1.00 #1.00Vacuum Condensible Material (VCM), % #0.10 #0.10Storage Life TestAAAThe storage life at the maximum recommended temperature and under the recommended storage conditions shall be stated in the manufacturers d
45、ata sheet.D6412/D6412M 99 (2012)39.3.2 Test ReportIn addition to the qualification testsamples, the manufacturer shall furnish a certified, dated andnumbered report giving the results of all tests listed in Section8. The individual and average values for the test shall bereported. The test report sh
46、all include all the requirements ofSection 7. The type of adherends, surface preparation includingcleaning, etching and application of primer, assemblyconditions, pressure, temperature and time of curing used in thepreparation of the test panels shall be reported. The report shallcertify that the pr
47、eparation of the adhesive and test specimensconformed to the description given in the instruction sheet.9.3.2.1 Test ReportThe manufacturer shall submit with thetest report (see 9.3.2) a copy of the data sheet that contains theinformation specified in 9.3.1.2.9.4 Quality Conformance Inspection:9.4.1
48、 Lot Acceptance TestsSamples of each lot of adhe-sive delivered on contract or purchase order shall be subjectedto the following: a test report shall be furnished for all qualityconformance test specimen in this specification, and shall besigned by an authorized representative of the laboratorymakin
49、g the tests.9.4.1.1 Room-Temperature Tensile Shear StrengthTheroom temperature tensile shear strength test shall be conductedin accordance with 8.3.1.9.4.1.2 High-Temperature Tensile Shear StrengthTestshall be conducted in accordance with 8.3.2.9.4.1.3 Low-Temperature Tensile Shear StrengthTest shallbe conducted in accordance with 8.3.3.9.4.1.4 Room-Temperature
