1、I f MI L - S - 46874 ( MI ) 14 December 1973 SUPERSEDING 12 January 1966 MIS-1 5734 MILITARY SPECIFICATION SEAL, RF AND PRESSURE This specification is approved for use by all activities of the Department of the Army. 1. SCOPE 1.1 Scope. This specification covers the requirements t for strips of mate
2、rial consisting of knitted Monel metal bonded to closed cell chloroprene rubber, which functions both as an RF and pressure seal. 1.2 Classification. The strips are classified by dash numbers in accordance with cross-sectional dimensions shown in Figure 1 and Table I. 2. APPLICABLE DOCUMENTS 2.1 The
3、 following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPECIFICATIONS Federal QQ-N-281 Nickel-Copper-Al loy (Monel and R-Monel) bars, Plates, Rods , Sheets, Strips , Wire , Forgings, and Str
4、uctural and Special Shaped Sections Mi 1 i tary MMM-A- 1 61 7 Adhesive, Rubber Base, General Purpose FSC 5330 THIS M)CUMENT CONTAINS - PAGES. A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-qb74 53 W 79779Ob 0107727 MIL-S- 46874 (MI) MIL-R-61
5、30 Rubber, Cellular, Chemically B1 own STANDARDS Fed er al FED-STD-601 Rubber, Sampling and Testing Mi 1 i tary MIL-STD-129 Marking for Shipment and Storage (Copies of specifications, standards, drawings,and other pub1 ications required by suppliers in connection with specific procurement functions
6、should be obtained from the procurement activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 Preproduction sample. When specified by the procuring activity (see 6.2), a preproduction sample shall be prepared using the sane methods proposed for subsequent production, and shall be
7、subjected to preproduction inspection (see 4.3). strips bonded to strips of cellular rubber. 3.2 General. The material shall consist of knitted Monel wire 3.3 Metal, 3.3.1 Wire. The wire shall be Monel conforming with the requirements of QQ-N-281, Class A, and shall have a diameter of ,0045 inch. 3.
8、3.2 Compression of wire. Upon application of 20 plus or minus 0.5 pounds per square inch (psi) load, the knitted wire shall compress 17 to 25 percent when tested in accordance with 4.5.1 o of MIL-R-6130, Type II, Grade A, Condition Medium. 3.4 Rubber. The rubber shall conform with the requirements 3
9、.5 Adhesive, 3.5.1 Conformance. The adhesive used to bond the wire to the rubber shall conform with the requirements of MMM-A-1617, Type II. 3.*5.2 Thickness. The thickness of the adhesive film between the rubber and the meal shall be .O10 inch. Provided by IHSNot for ResaleNo reproduction or networ
10、king permitted without license from IHS-,-,-I (RUBBER) (MET AL) i Figure 1 Tab1 e .I. imensions Specification Number MIL-S-46874- 1 MIL-S-46874-2 MI L-S-46874- 3 MI L - S - 46 87 4 - 4 MIL-S-46874- 5 MIL-S-46874-6 MIL-S-46874-7 MI L - S - 4687 4- 8 MIL- S- 46874- 9 MIL-S-46874-10 Dimension, Inch A B
11、 C .25 .50 .375 .50 125 .50 .25 .19 .19 .125 .25 .25 .125 .50 .125 ,125 .19 .125 .125 - .75 .125 3.6.1.2 Length. The length shall be as specified in the pro- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.6.2 To1 erances. Dimensional with Table II
12、. Table II. To1 tolerances shall be in accordance rances Dimens i on (Inch) Tolerance (Inch) Rubber Metal .O6 through .125 t.03, - .O15 t.015, -0 Over ,125 through ,19 - +.O3 t.015, -0 Over .19 through ,375 - +.O3 t.03, -0 Over .375 through .50 - +.O6 t.05, -0 +.O6 - Over .50 through .75 - 3.7 Produ
13、ct i denti f i cation. 3.7.1 Information to be shown. Unless otherwise specified in the procuring document, each separa-te sheet and strip of material shall have a tag attached showing the following: a. MIL-S-46874 and appropriate dash number. b. Vendors name or code. c. Manufacturers material desig
14、nation. d. Date of manufacture (year and quarter). 3.7.2 Marking-. Marking shall be in accordance with the requirements of MIL-STD-129. 3.8 Workmanship, The material shall be of high quality and uniformity and shall be free of contamination, unevenness, tears, cuts, abnormal holes, and other defects
15、. Workmanship shall be such as to ensure a product which is in conformance with this specification. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of al 1 inspection requ
16、irements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform
17、any of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-qb87q 53 m 9979906 0107732 . the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements .
18、4.2 Classification and tests. The testing of the material shall be classified as follows: 4.2.1 Preproduction inspection (4.3). 4.2.2 Quality conformance inspection (4.4). 4.3 Preproduction inspection. Preproduction inspection shall consist of all examinations and tests specified herein and shall be
19、 conducted only on preproduction samples. be prepared using the same methods to be used for the manufacture of al 1 subsequent production material. The preproduction samples shall 4.4 Quality conformance inspection. 4.4.1 Inspections. Quality conformance inspection tests shall be the examination and
20、 tests required for each production lot. consist of finished material made on any single day from individual lots or rubber and metal components. A production lot shall 4.4.2 Sampling. Two 2 foot samples of each dash number mater.ia1 shall be taken at random from each shipment. Tests shall be run in
21、 duplicate using one specimen from each of the selected samples. 4.4.3 Quality conformance tests. Quality conformance tests shall include checking for dimensional requirements in accordance with 3.6 and comparison of the material with an approved sample to determine simi- larity of appearance and ad
22、equate workmanship in accordance with 3.9. 4.5 Test methods. 4.5.1 Metal compression. In order to determine conformance with 3.3.2, any conventional method may be used. 4.5.2 Adhesion. In order to determine conformance with 3.5.3, the bond between the rubber and the metal shall be tested in accordan
23、ce with Method 8031 or FED-STD-601. no adhesive failure shall be regarded as a satisfactory bond. Rupture of the rubber and 5. PREPARATION FOR DELIVERY 5.1 Packaging and packing. 5.1.1 Level C. Unless otherwise specified in 6.2, each cross- sectional size of material shall be packed separately. The
24、material shall not be folded or compressed. Packaging shall conform to good 5 - . f.- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-46874( MI) commercial practice and shall protect the material from contamination, damage, and change of shape
25、during shipment and storage and shall assure safe delivery and acceptancy at destination. 5.2 Marking, Marking shall be in accordance with MIL-STD-129 and shall include but shall not necessarily be limited to the following: a. MIL-S-46874 b. Vendors name. c. Manufacturer s materi al desi gnat i on.
26、d. Quantity and dimensions. e, Contract or procurement document number. 6. NOTES 6.1 Intended use, This material is intended for use as a compressible gasketing where both RF and pressure sealing are requ Irecl. 6.2 Ordering data. Procurement documents should specify the fol 1 owing: a. Title, numbe
27、r, and date of this specification. bo Whether preproduction samples and test reports are required. c. Special packaging and packing instructions, if requi red d. Other special instructions. 6.3 Standard test method. Due to the lack of a standard test method for determining RF energy attenuation prop
28、erties there are no such requirements in this specification. recommended that the material be tested in the equipment where it is intended to be used, to assure that it is satisfactory. It is therefore 6.4 Recomendation. It is recommended that the rubber com- ponent of the product be examined three
29、years after cure date. If the rubber meets the compression deflection requirements and shows no evidence of cracks on folding, it is suggested that it be considered satisfactory for use. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
