1、NOT MEASUREMENTSENSITIVEMIL-PRF-23586F30 December 1996SUPERSEDINGMIL-S-23586E10 July 1987PERFORMANCE SPECIFICATIONSEALING COMPOUND (WITH ACCELERATOR), SILICONE RUBBER, ELECTRICALThis specification is approved for use by all Departments and Agenciesof the Department of Defense.1. SCOPE1.1 Scope. This
2、 specification covers the requirements for electrical silicone rubber sealingcompounds that are not resistant to fuel. These compounds are intended for use in the temperaturerange of -62 to +204C (-80 to +400F).1.2 Classification. The sealing compound is furnished in the following types, classes and
3、grades, as specified (see 6.2):1.2.1 Type. The sealing compound is classified by viscosity of the base compound as follows:Type I - Low viscosityType II - Intermediate viscosityType III - High viscosity1.2.2 Class. The sealing compound is classified as follows:Class 1 - Fast cure (room temperature 2
4、5 1C 77 2F)Class 2 - Medium cure (room temperature 25 1C 77 2F)Class 3 - Slow cure (room temperature 25 1C 77 2F)Class 4 - Elevated temperature cure 80 1C (175 2F)Beneficial comments (recommendations, additions, deletions) and any pertinent data which may beof use in improving this document should b
5、e addressed to: Commander, Naval Air Warfare CenterAircraft Division, Code 414100B120-3, Highway 547, Lakehurst, NJ 08733-5100, by using theStandardization Document Improvement Proposal (DD Form 1426) appearing at the end of thisdocument or by letter.AMSC N/A FSC 8030DISTRIBUTION STATEMENT A. Approv
6、ed for public release; distribution is unlimited.1.2.3 Grade. The sealing compound is furnished in the following grades:Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F2Grade A - Condensation cureGrade B1 - ersion resistant, condensatio
7、n cureGrade B2 - ersion resistant, addition cure2. APPLICABLE DOCUMENTS2.1 General. The documents listed in this section are specified in sections 3 and 4 of thisspecification. This section does not include documents cited in the other sections of thisspecification or recommended for additional info
8、rmation or as examples. While every effort hasbeen made to ensure the completeness of this list, document users are cautioned that they mustmeet all specified requirements documents cited in sections 3 and 4 of this specification, whether ornot they are listed.2.2 Government documents.2.2.1 Specific
9、ations, standards, and handbooks. The following specifications, standards, andhandbooks form a part of this document to the extent specified herein. Unless otherwise specified,the issues of these documents are those listed in the issue of the Department of Defense Index ofSpecifications and Standard
10、s (DoDISS) and supplement thereto, cited in the solicitation (see 6.2).SPECIFICATIONSFEDERALQQ-A-250/13 - Aluminum Alloy Alclad 7075, Plate and SheetTT-E-751 - Ethyl Acetate, TechnicalTT-I-735 - Isopropyl AlcoholTT-N-97 - Naphtha, AromaticDEPARTMENT OF DEFENSEMIL-P-38714 - Packaging and Packing of T
11、wo-component Materials inSemkitsMIL-C-38736 - Cleaning Compound, Solvent Mixtures, for use in Integral FuelTanks(Unless otherwise indicated, copies of specifications, standards and handbooks are availablefrom the DoDSSP - Customer Service, Standardization Documents Order Desk, 700 RobbinsAvenue, Bld
12、g. 4D, Philadelphia, PA 19111-5094.)2.3 Non-Government publications. The following documents form a part of this document tothe extent specified herein. Unless otherwise specified, the issues of the documents which are DoDadopted are those listed in the issue of the DoDISS cited in the solicitation.
13、 Unless otherwiseProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F3specified, the issues of documents not listed in the DoDISS are the issues of the documents cited inthe solicitation (see 6.2).AMERICAN SOCIETY FOR TESTING AND MATERIALS
14、(ASTM)ASTM-D149 - Dielectric Breakdown Voltage and Dielectric Strength of SolidElectrical Insulating Materials at Commercial Power Frequencies,Standard Test Method for (DoD Adopted)ASTM-D150 - AC Loss Characteristics and Permittivity (Dielectric Constant) ofSolid Electrical Insulation, Standard Test
15、 Method for (DoDAdopted)ASTM-D257 - DC Resistance or Conductance of Insulating Materials, StandardTest Method for (DoD Adopted)ASTM-D412 - Vulcanized Rubber and Thermoplastic Rubbers and ThermoplasticElastomers - Tension, Standard Test Method for (DoD Adopted)ASTM-D471 - Rubber Property - Effect of
16、Liquids, Standard Test Method forASTM-D495 - High-Voltage, Low-Current, Dry Arc Resistance of Solid ElectricalInsulation, Standard Test Method for (DoD Adopted)ASTM-D740 - Methyl Ethyl Ketone, Standard Specification for (DoD Adopted)ASTM-D746 - Brittleness Temperature of Plastics and Elastomers by I
17、mpact,Standard Test Method for (DoD Adopted)ASTM-D2240 - Rubber Property - Durometer Hardness, Standard Test Method for(DoD Adopted)(Application for copies should be addressed to the American Society for Testing andMaterials, 100 Barr Harbor Drive, West Conshohoken, PA 19428-2959.)2.4 Order of prece
18、dence. In the event of a conflict between the text of this document and thereferences cited herein the text of this document takes precedence. Nothing in this document,however, supersedes applicable laws and regulations unless a specific exemption has been obtained.3. REQUIREMENTS3.1 Qualification.
19、The sealing compound, along with the curing agent and primer, whenrequired, furnished under this specification shall be products that are authorized by the qualifyingactivity for listing on the applicable qualified products list before contract award (see 4.2 and 6.4).3.2 Materials. The sealing comp
20、ound shall be based on polysiloxane polymer and shall requirea separate curing agent. Classes 1, 2, and 3 shall cure at room temperature. Class 4 shall be curedat elevated temperatures only.3.2.1 Primer (Classes 1, 2, and 3). When required, the manufacturer shall recommend aprimer to be used in all
21、adhesion and repairability tests. Class 4 materials do not require a primer.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F43.3 Physical properties.3.3.1 Properties before cure.3.3.1.1 Appearance. The base compound and curing agent sha
22、ll be uniform and free of skin,jelled or coarse particles. There shall be no separation of components that cannot be dispersed bymechanical agitation or hand mixing. The sealing compound shall be furnished in theas-manufactured color.3.3.1.2 Nonvolatile content. The nonvolatile content of each type
23、mixed sealing compoundshall be not less than 98 percent when tested as specified in 4.7.2.3.3.1.3 Viscosity, based compound. Viscosity of the base compound, in poises, when testedas specified in 4.7.3, shall be as follows:Type I - 200, maximumType II - 200 to 2,000Type III - 5,000 to 20,0003.3.1.4 P
24、ot life. When tested as specified in 4.7.4.1, pot life shall be as follows.Class 1 - 15 to 45 minutesClass 2 - 1 to 3 hoursClass 3 - 3 to 7 hoursClass 4 - 8 hours, minimum (Grade B-2)3.3.1.5 Application time Grade B-2 (classes 1, 2, and 3) only. Application time shall bedetermined by a viscometer in
25、 accordance with 4.7.4.2. The viscosity at the end of the ratedapplication time shall be as follows:Type I - 400 poises, maximum, after 45 minutes.Type II - 2,000 poises, maximum, after 1.5 hours.3.3.2 Properties after cure.3.3.2.1 Physical properties. Physical properties of the cured sealing compou
26、nd shall be asspecified in table I.3.3.2.2 Corrosion. The encapsulated wire shall not exhibit more corrosion than the corrosionon the control wire, when tested as specified in 4.7.16.3.3.2.3 Reversion (deep section cured) resistance (Grades B1 and B2). Reversion resistanceshall consist of a deep sec
27、tion cure, followed by heat aging. The as-cured hardness, whendetermined in accordance with 4.7.17, shall be not more than 5 points less than the as-receivedProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F5value from 4.7.5. After heat a
28、ging, the hardness shall not decrease by more than 7 points from thedeep section cure hardness.3.3.2.4 Storage life. After being stored as specified in 4.7.18, the viscosity of the basecompound shall not exceed by more than 30 percent the as-received viscosity, and cured specimensmade from the store
29、d compound shall exhibit a hardness within 5 points of the as-receivedhardness.TABLE I. Physical properties after cure.Characteristics Requirements by type Test paragraphIIIIIIHardness, points, minimum:Class 1Class 2Class 3Class 44035403545304550454545-4.7.5Tensile strength, psi, minimumClasses 1,2,
30、 and 3Class 4250150325600400-4.7.6Elongation, percent (%), minimumClasses 1,2, and 3Class 410070100150100-4.7.6Linear shrinkage, %, maximumClasses 1,2, and 3Class 41.02.51.02.01.0-4.7.7Specific gravity, maximum 1.504.7.8Brittle point, F, maximum -904.7.9Adhesion, pounds, minimum 44.7.10Hydrolytic st
31、ability: Hardness afterexposure, points, minimum304.7.12Water immersion 72 hours at 60C,change in:Weight, %, maximumVolume, %, maximumHardness, points, maximum23104.7.13Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F6TABLE I. Physical
32、properties after cure. - Continued.CharacteristicsRequirements by typeTest paragraphI II IIIOil immersion 72 hours at 100C, change in:Weight, %, maximumVolume, %, maximumHardness, points, maximumTensile strength, %, maximumElongation, % from original, % maximum+5+10-10-25-254.7.14Heat aging 72 hours
33、 at 204C:Adhesion, pounds, minimumChange in:Hardness, points, maximumTensile strength, %, maximumElongation, % from original,%, maximum410-25-254.7.153.3.2.4.1 Shelf life extension (for field use). The field storage life of these compounds may beextended an additional 3 months providing the requirem
34、ents specified in 3.3.2.4 are met. Themethod of examination shall be as specified in 4.7.18.1. Material may be tested again after 3 moremonths storage. If acceptable, extend the storage period an additional 3 months.3.3.2.5 Electrical properties. The electrical properties of the cured sealing compou
35、nd shallconform to the requirements in table II.3.4 Unit of issue. In order to interface with existing equipment and meet the required storagecharacteristics, the sealing compound unit of issue shall be in kits as follows:a. 1 pint and 1 gallon kits - Base compound filled to 75 percent by volume in
36、multiplefriction top 1 pint or 1 gallon metal containers with the appropriate amount of curingagent in smooth, vertical, glass lined or plastic lined jars with screw cap (to facilitateremoval of the curing agent).b. 2 ounce and 6 ounce sectional type (see 6.7) kits - The total content (base compound
37、and curing agent) shall be 2 fluid ounces in the 2 and 3 fluid ounces in the 6 ouncesectional type container. The volume tolerance shall be 1/8 fluid ounce.c. 5 gallon kit - The base compound shall be supplied in 5 gallon metal containers withsealed crimped lids. Appropriate amounts of curing agent
38、shall be in multiple friction topmetal containers. Appropriate amounts of the supplier recommended primer shall befurnished in containers compatible with the primer. The ratio of the quantity contained inthe base compound container to the quantity contained in the attached curing agentcontainer shal
39、l be the same as the recommended mixing ratio of the base compound andcuring agent.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F7TABLE II. Electrical properties of cured silicone rubber compounds.TestType I Type II Type III TestPara.
40、Grade Grade GradeA B1 Grades B1 and B2.4.7.17.1 Preparation of test specimens. The container for the confinement of the catalyzedsilicone elastomer shall be a metal tube, 4.250 0.005 inches in length, threaded at both ends,having an inner diameter of 2.5 inches and a wall thickness capable of suppor
41、ting threading. Metalscrew caps and aluminum foil gaskets that provide an air-tight seal shall be used for end closuresProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-23586F15and shall be designed so that the total inside height of the capped
42、 tube does not exceed4.250 0.005 inches. Seal one end of the tube and pour the mixed and aerated catalyzed sealingcompound to a depth of 4.125 0.032 inch. The compound shall be vacuum deaerated for 5minutes at less than 5 mm mercury (Hg) pressure at 25 1C (77 2F). Allow the material tocure as specif
43、ied in 4.6 with the container top uncapped. The sealing compound shall remain in themold for the entire test cycle. Remove the bottom cap and determine the hardness in the centerarea of the bottom surface using a Type A Durometer (as-cured hardness). Seal both ends of thetube and condition the test
44、fixture at 71 1C (160 3F) for 28 days for grade B1 and at200 1C (392 2F) for 7 days for grade B2.4.7.17.2 Testing. At the expiration of the heat aging period, allow the test fixture to cool atstandard conditions (see 4.4.1) for 24 1 hours. Obtain a hardness reading in the same area wherethe as cured
45、 hardness was determined. Tests shall be made in duplicate and compliance with3.3.2.3 shall be noted.4.7.18 Storage life (shelf life). One pint of the base compound together with its curing agentshall be stored separately in the as-received container for 6 months (time shall be counted fromdate of s
46、hipment). The storage temperature shall not exceed 25C (77F). The compound shall betested for viscosity (4.7.3), and cured specimens molded shall be tested for hardness (4.7.5) at thebeginning and end of the storage period. Conformance to 3.3.2.4 shall be noted.4.7.18.1 Extension of field storage pr
47、ocedure. Two containers of material from the same lotthat have reached the shelf life (field service) limitation shall be selected and tested as specified in4.7.18 to determine whether extension of shelf life is possible.4.7.19 Dielectric strength. Disk specimens, 4 inches in diameter and approximat
48、ely 0.075 inchthick, shall be cured as specified in 4.7. Dielectric strength determinations shall be made inaccordance with ASTM-D149. Electrodes with a diameter of 0.25 inch shall be used and the testsshall be made under oil at a frequency not exceeding 100 Hertz (Hz). The voltage shall beincreased
49、 uniformly at the rate of 500 volts per second.4.7.20 Volume and surface resistivity. Three disk specimens, 4 inches in diameter andapproximately 0.075 inch thick, shall be prepared and cured as specified in 4.6. Resistivity testsshall be conducted in accordance with ASTM-D257, using a General Radio Type 544B bridge orequivalent instrument with a test voltage of 500 vo
