1、Designation: D6411/D6411M 99 (Reapproved 2012)Standard Specification ForSilicone Rubber Room Temperature Vulcanizing LowOutgassing Materials1This standard is issued under the fixed designation D6411/D6411M; the number immediately following the designation indicates theyear of original adoption or, i
2、n 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 flowable space graderoom temperature vulcanizi
3、ng (RTV) silicone rubber adhesiveor compound. The material is specifically designed for appli-cations requiring extreme low temperature, low outgassing andminimal volatile condensibles under extreme operating condi-tions. The RTV silicone rubber should be suitable for with-standing environmental exp
4、osure to temperatures from 115 to200C (175 to 392F). The material should also withstand thecombination of stress, temperature, and relative humidityexpected to be encountered in service. The RTV silicone rubbermay be used as a sealing, caulking, potting or bonding materialfor applications on metal,
5、plastics, rubber, glass, and ceramicproducts. Types I and II are often used as coatings.1.2 The values stated in SI units or inch-pound units are tobe regarded separately as standard. Within the text, theinch-pound units are shown in brackets. The values stated ineach system are not exact equivalent
6、s; 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 statement refers to the testmethod portion only, Section 8, of this specification: Thisstandard does not purport
7、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 determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2B209 Spec
8、ification for Aluminum and Aluminum-AlloySheet and PlateD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Elect
9、rical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD907 Terminology of AdhesivesD1002 Te
10、st Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D1084 Test Methods for Viscosity of AdhesivesD2240 Test Method for Rubber PropertyDurometer Hard-nessD2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingD3951 P
11、ractice for Commercial PackagingE595 Test Method for Total Mass Loss and Collected Vola-tile Condensable Materials from Outgassing in a VacuumEnvironment2.2 National Aeronautics and Space Administration(NASA):JSC SP-R-0022 General Specification, Vacuum StabilityRequirement of Polymeric Material for
12、Spacecraft Appli-cation3MSFC-HDBK-527/JSC-09604 Material Selection List forHardware Systems3GSFC RP 1124 Outgassing Data for Selecting SpacecraftMaterials3NOTE 1Copies of specifications, standards, drawings and publicationsrequired by suppliers in connection with specific purchases should beobtained
13、 from the purchaser or as directed by his contracting officer.3. Terminology3.1 Definitions:1This specification is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of subcommittee D14.80 on MetalBonding Adhesives.Current edition approved Oct. 1, 2012. Publish
14、ed October 2012. Originallyapproved in 1999. Last previous edition approved in 2005 as D6411/D6411M - 99(2005). DOI: 10.1520/D6411_D6411M-99R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards v
15、olume information, refer to the standards Document Summary page onthe ASTM website.3Unless otherwise indicated, copies of the above documents are available froma NASA installation library or document repository.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
16、9428-2959. United States13.1.1 Many terms in this specification are defined in Termi-nology D907.3.1.2 lot, na specific material that can be identified by theplace of manufacture, quantity and type of raw materials andprocess conditions used.3.2 Definitions of Terms Specific to This Standard:3.2.1 R
17、TV, adjroom temperature vulcanizing.3.2.2 RTV Silicone Rubber Compound, na silicone resinbase (A) and a silicone resin curing agent (B) when mixed in aproper ratio results in a rubbery compound. A RTV siliconerubber compound that is manufactured by a unique combina-tion of raw silicone materials and
18、 manufacturing process thatconforms to a given set of physical and performance propertiesand is identified by specific name, number, or alphanumericdesignation.NOTE 2A “curing agent” is commonly used with this type of siliconerubber compound. The term “accelerator” or “catalyst” is synonymouswith “c
19、uring agent.”4. Significance and Use4.1 GeneralThis specification provides material require-ments and testing procedures to differentiate between thephysical, mechanical, electrical, adhesive bonding propertiesof three types of RTV silicone rubber compounds.4.2 The physical, mechanical and electrica
20、l properties of theRTV silicone rubber are tested and measured to providespecific data on requirements for qualification and lot accep-tance of separate ingredients comprising the RTV siliconerubber compounds and the properties resulting from the curedmixture.NOTE 3Because of the many number of adhe
21、rend materials bondedwith RTV silicone rubber material, testing by this specification will onlyevaluate the RTV silicone rubber material under a given set of conditions.5. Classification5.1 The RTV low volatile silicone rubber compounds shallbe furnished as one of the following types:5.1.1 Type IA l
22、ow viscosity, two-part system consists of asilicone resin base (A) and a liquid curing agent (B) whenmixed and cured results in a Shore A hardness of 60.5.1.2 Type IIA medium viscosity, two-part system con-sists of a silicone resin base (A) and a liquid curing agent (B)when mixed and cured results i
23、n a Shore A hardness of 40.5.1.3 Type IIIA medium viscosity thixotropic, two-partsystem consists of a silicone resin base (A) and a liquid curingagent (B) when mixed and cured results in a minimum ShoreA hardness of 40.6. Ordering Information6.1 Procurement DocumentsPurchasers may select any ofthe d
24、esired options offered herein and the procurement docu-ments should specify the following:6.1.1 Title, number and dated revision of this specification,6.1.2 RTV silicone rubber material type and number,6.1.3 Amounts and unit quantities of RTV rubber compoundrequired,6.1.4 Curing conditions,6.1.5 Lev
25、el of packaging and packing required,6.1.6 Whether or not qualification is necessary, and6.1.7 Storage conditions.6.2 QualificationIn case the RTV silicone rubber com-pound(s) that are qualified/approved at the time set for openingof bids, the procurement documents should state that theawards will b
26、e forthcoming.7. Test Requirements7.1 MaterialThe RTV silicone rubber compound, whentested per Section 8, shall meet the physical, mechanical andelectrical, and outgassing requirements as specified in Table 1.The silicone rubber compound shall not have a detrimentaleffect on surfaces being in contac
27、t or bonded over the range oftemperatures at which the RTV silicone rubber compounds willbe used.7.2 QualificationQualification shall only apply to theformulation on which the qualification tests have been made;any changes by the manufacturer in formulation or method ofmanufacturing, shall be cause
28、of designating the RTV siliconerubber compound as a new product. The new product shall begiven a new code number and shall be requalified and approveduntil it has been shown to meet the requirements of thisspecification.7.3 Working Characteristics:7.3.1 ApplicationThe RTV silicone rubber compoundsha
29、ll be suitable for application to surfaces in accordance withthe manufacturers instructions.7.3.2 CuringThe time, temperature, and pressure used tocure the RTV silicone rubber compound shall be in accordancewith the manufacturers recommendation.8. Test Methods8.1 Qualification TestsFor qualification
30、, the RTV siliconerubber compound shall be tested using the tests described inthis section. All tests specified in Table 1 shall be performed atroom temperature, 25 6 3C 77 6 5F with the exception ofthe outgassing test.8.2 Preparation of Test SpecimensPrepare at least tenspecimens for each separate
31、test as follows:8.2.1 Tensile Shear Strength Specimens:8.2.1.1 AdherendThe metal substrate shall be 6061-T6 or2024-T3 aluminum alloy in accordance with SpecificationB209.8.2.1.2 Surface PreparationClean and etch in accordancewith Practice D2651.8.2.1.3 CureTime and temperature for curing the RTVsili
32、cone rubber material shall be in accordance with themanufacturers recommendations.NOTE 4Control of bondline thickness shall be accomplished byplacing two lengths of 0.13 mm (0.005 in.) diameter stainless wire in thelengthwise direction on the specimen bond area during the adhesivebonding operation;
33、the use of the same diameter glass beads approxi-mately 0.5 % by weight, thoroughly mixed in the adhesive can also beused to maintain uniform bondine thickness.NOTE 5When applying or bonding the RTV rubber compound, careshould be taken to avoid air entrapment. When practical, it is suggestedthat app
34、lying be done under vacuum or that the application area beD6411/D6411M 99 (2012)2evacuated afterward to remove any entrapped air. For bonding metals, aprimer recommended by the manufacturer shall be used.8.2.2 Tensile Strength and Elongation Test SpecimensTensile strength and elongation test specime
35、ns shall be pre-pared for test in accordance with Test Method D412.8.2.3 Hardness TestsFor Shore A hardness measurement,prepare a mixture of resin and curing agent in ratios specifiedby the manufacturer. Pour the thoroughly mixed material intoan aluminum foil cup approximately 7.6 cm 3.0 in. indiame
36、ter and a minimum thickness of 0.64 cm 0.25 in.; cureper manufacturers recommendations.8.3 Test Procedures:8.3.1 All tests listed in Table 1 (except outgassing) shall beperformed at 25 6 3C 77 6 5F9. Inspection9.1 Responsibility for InspectionUnless otherwise speci-fied in the contract or purchase o
37、rder, 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 otherfacility suitable for the performance of inspection requirementspecified herein. The purc
38、haser has the right to perform any ofthe inspections set forth in this specification where suchinspections are deemed necessary to ensure compliance withthe requirements.9.2 Classification of InspectionsThe inspection require-ments specified are classified as follows:9.2.1 Qualification inspection (
39、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 (see 6.2), RTV silicone rubber compound that hasnot passed the qualification tests, must be tested against thisspecification and proved to meet
40、all its requirements.9.3.1.1 At the option of the purchaser, qualification testsmay be performed at any time.9.3.1.2 Data SheetA dated, coded, and title data sheetstating the RTV silicone rubber material property data andTABLE 1 Property Requirements for the RTV Silicone Rubber CompoundsTestATestMet
41、hodRequirementType I Type II Type IIIUncured PropertySpecific Gravity 25 3C 77 5F D792Part A 1.46-1.52 1.04-1.08 1.08Part B 1.15 . .Resin Weight, kg/L (lb/gal)Part A 1.49 12.42 1.02 8.50 1.08 9.00Part B 1.15 9.59 . . . . . .Viscosity, CPS 25 3C 77 5F D1084Part A 33 000-58 000 7000-10 000 Non-SlumpBP
42、art B N/A N/AWork (Pot) Life, h 1.5 1 4to6Cured Property(Cured at 25 3C (77 5F) 50 % RelativeHumidity for 24 h for Type I and Seven Days forTypes II and III)Durometer, Shore A D2240 60 5 40 5 40 min.Tensile Shear Strength on Primed Aluminum, MPaPSI D1002 3.21 465 . . . . . .Tensile Strength, MPa PSI
43、 D412 3.45 500 min 3.45 500 min 6.20 900Elongation, % D412 120 80 min 100Dielectric Strength, kv/mm v/mil D149 21.2 540 22.3 570 22.3 570Dielectric Constant D150 1 kHZ 3.9 2.75 2.75 100 kHZ . . . 2.73 2.73Volume Resistivity, Ohm-cm D257 210146.910136.91013Outgassing Characteristics E595Total Mass Lo
44、ss (TML), % # 1.0 # 1.0 # 1.0Volatile Condensible Material (VCM), % # 0.1 # 0.1 # 0.1Storage Life . . .CC CAAll values as stated are typical unless otherwise indicated. The values as stated are the minimal to be met by the averages of the results for the specimens tested.BThe mixture of Part “A” and
45、 Part “B” will not flow or run when used in a vertical position.CThe storage life at the maximum recommended temperature and under the recommended storage conditions shall be stated in the manufacturers data sheet.D6411/D6411M 99 (2012)3procedures for mixing, curing, bonding, storage and shelf life,
46、etc., shall be supplied by the manufacturer for the initialpurchase order. Reorders of the same material do not require aduplicate copy of the data sheet unless otherwise required. Thedata sheet shall be forwarded with the test report (see 9.3.2)when requesting qualification.9.3.2 Test ReportIn addi
47、tion to the qualification testsamples, the manufacturer shall furnish a certified and datedand numbered report, giving the results of all tests listed inSection 8. The individual and average values for each test shallbe reported. The test report shall cover all the requirements ofSection 7. The Type
48、 of adherends, surface preparation (includ-ing cleaning, etching and primer, if required) assemblyconditions, pressure, temperature and time of curing used in thepreparation of the test panels shall be reported. The report shallcertify that the preparation of the material and test specimensconformed
49、 to the description given in the data sheet.9.4 Quality Conformance InspectionSamples of each lotof material delivered on contract or purchase order shall besubjected to the following quality conformance tests: Testreports shall be furnished for all quality conformance testspecimen in this specification, and shall be signed by anauthorized representative of the laboratory making the tests.NOTE 6Acceptance or approval of material during the course ofmanufacture shal
