ASTM D6411 D6411M-1999(2005) Standard Specification for Slicone Rubber Room Temperature Vulcanizing Low Outgassing Materials《低释气性材料室温硫化硅酮橡胶的标准规范》.pdf

1、Designation: D 6411/D 6411M 99 (Reapproved 2005)Standard Specification ForSilicone Rubber Room Temperature Vulcanizing LowOutgassing Materials1This standard is issued under the fixed designation D 6411/D 6411M; the number immediately following the designation indicates theyear of original adoption o

2、r, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 The specification covers a two-part flowable space graderoom temperature vulc

3、anizing (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 environmenta

4、l exposure 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 me

5、tal, 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 equiv

6、alents; 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 pur

7、port 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:2B 20

8、9 Specification for Aluminum and AluminumAlloy,Sheet and PlateD 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 150 Test Methods for AC Loss Characteristics and Per-mittivity (Dielectric Constant) of Sol

9、id Electrical Insula-tionD 257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD 412 Test Methods for Vulcanized Rubber and Thermo-plastic Elastomers - TensionD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 907 Terminology of A

10、dhesivesD 1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D 1084 Test Methods for Viscosity of AdhesivesD 2240 Test Method for Rubber Property-Durometer Hard-nessD 2651 Guide for Preparation of Metal Surfaces for

11、Adhe-sive BondingD 3951 Practice for Commercial PackagingE 595 Test Method for Total Mass Loss and CollectedVolatile Condensable Materials from Outgassing in aVacuum Environment2.2 National Aeronautics and Space Administration(NASA)JSC SP-R-0022 General Specification, Vacuum StabilityRequirement of

12、Polymeric Material for 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 purc

13、hases should beobtained from the purchaser or as directed by his contracting officer.3. Terminology3.1 DefinitionsMany terms in this specification are de-fined in Terminology D 907.1This specification is under the jurisdiction of ASTM Committee D14 onadhesives and is the direct responsibility of sub

14、committee D14.80 on Metal BondingAdhesives.Current edition approved April 1, 2005. Published May 2005. Originallyapproved in 1999. Last previous edition approved in 1999 as D 6411/D 6411M - 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at se

15、rviceastm.org. For Annual Book of ASTMStandards volume 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.1Copyright ASTM International, 100 Barr

16、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.1 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 RTV, adjroom temperatur

17、e 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 manufacturing process

18、 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 “curing agent.”4. Signif

19、icance 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 electrical properties of theRTV

20、 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 adherend materials bondedw

21、ith 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 low viscosity, two-part

22、 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 in a Shore A hardness o

23、f 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 desired options offered

24、 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 Level of packaging and pa

25、cking 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 be forthcoming.7. Test

26、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 contact or bonded over the r

27、ange 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 of designating the RTV

28、 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 compoundshall be suitable for app

29、lication 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, the RTV siliconerubb

30、er 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 test as follows:8.2.1

31、Tensile Shear Strength Specimens:8.2.1.1 AdherendThe metal substrate shall be 6061-T6 or2024-T3 aluminum alloy in accordance with SpecificationB 209.8.2.1.2 Surface PreparationClean and etch in accordancewith Practice D 2651.8.2.1.3 CureTime and temperature for curing the RTVsilicone rubber material

32、 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; the use of the same

33、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 applying be done under

34、vacuum or that the application area beevacuated afterward to remove any entrapped air. For bonding metals, aprimer recommended by the manufacturer shall be used.D 6411/D 6411M 99 (2005)28.2.2 Tensile Strength and Elongation Test SpecimensTensile strength and elongation test specimens shall be pre-pa

35、red for test in accordance with Test Method D 412.8.2.3 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. indiameter and a minimum

36、 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 order, the supplie

37、r 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 purchaser has the rig

38、ht 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 (see 9.3), and9.2.

39、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 all its requiremen

40、ts.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 andprocedures for mixing, curing, bonding, storage and shelf life,etc., shall be supplied by the man

41、ufacturer for the initialpurchase order. Reorders of the same material do not require aTABLE 1 Property Requirements for the RTV Silicone Rubber CompoundsTestATestMethodRequirementType I Type II Type IIIUncured PropertySpecific Gravity 25 6 3C 77 6 5F D 792Part A 1.46-1.52 1.04-1.08 1.08Part B 1.15

42、. .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 6 3C 77 6 5F D 1084Part A 33 000-58 000 7000-10 000 Non-SlumpBPart B N/A N/AWork (Pot) Life, h 1.5 1 4to6Cured Property(Cured at 25 6 3C (77 6 5F) 50 % RelativeHumidity for 24 h for Type

43、I and Seven Days forTypes II and III)Durometer, Shore A D 2240 60 6 5406 5 40 min.Tensile Shear Strength on Primed Aluminum, MPaPSI D 1002 3.21 465 . . . . . .Tensile Strength, MPa PSI D 412 3.45 500 min 3.45 500 min 6.20 900Elongation, % D 412 120 80 min 100Dielectric Strength, kv/mm v/mil D 149 21

44、.2 540 22.3 570 22.3 570Dielectric Constant D 150 1 kHZ 3.9 2.75 2.75 100 kHZ . . . 2.73 2.73Volume Resistivity, Ohm-cm D 257 2 3 10146.9 3 10136.9 3 1013Outgassing Characteristics E 595Total Mass Loss (TML), % # 1.0 # 1.0 # 1.0Volatile Condensible Material (VCM), % # 0.1 # 0.1 # 0.1Storage Life . .

45、 .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 Part “B” will not flow or run when used in a vertical position.CThe storage life at the maximum reco

46、mmended temperature and under the recommended storage conditions shall be stated in the manufacturers data sheet.D 6411/D 6411M 99 (2005)3duplicate 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 T

47、est ReportIn addition 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 ofSe

48、ction 7. The Type of adherends, surface preparation (includ-ing cleaning, etching and primer, if required) assembly condi-tions, 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

49、 specimensconformed 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 shall