1、AMSC N/A FSC 5985 INCH-POUND MIL-DTL-24211C 9 February 2011 SUPERSEDING MIL-DTL-24211B 19 November 2004 DETAIL SPECIFICATION GASKETS, WAVEGUIDE FLANGE GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. Th
2、is specification covers the general requirements for pressure sealing gaskets used with general purpose cover flanges and flat face flanges covered by MIL-DTL-3922. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. T
3、his section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of docu
4、ments cited in sections 3, 4 or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2 Specifications, standards, and handbooks. The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specifi
5、ed, the issues of these documents are those cited in the solicitation or contract (see 6.2). COMMERCIAL ITEM DESCRIPTIONS A-A-59588 - Rubber, Silicone. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-3922 - Flanges Waveguide, General Purpose, General Specification for. MIL-DTL-24211/1 - Gaskets, Wavegu
6、ide Flange (Cover). MIL-DTL-24211/2 - Gaskets, Waveguide Flange (Flat Face). DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. (Copies of these documents are available from the Standardization Document Order Desk, Building 4D, 700 Robbins Avenu
7、e, Philadelphia, PA 19111-5094 or at https:/assist.daps.dla.mil.) Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to TubesAmpsdla.mil. Since contact information can change, you may
8、want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24211C 2 2.3 Non-Government publications. The following documents form a p
9、art of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are cited in the solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI-H35.1 - Alloy and Temper Designation Systems for Aluminum. (Applications for copies of
10、 ANSI publications should be addressed to ANSI, 11 West 42ndStreet, New York, NY 10036 or by e-mail at http:/web.ansi.org.) ASTM INTERNATIONAL (ASTM) ASTM-B26/B26M - Aluminum-Alloy Sand Castings. ASTM-B85/B85M - Aluminum-Alloy Die Castings. ASTM-B108/B108M- Aluminum-Alloy Permanent Mold Castings. AS
11、TM-B209 - Aluminum and Aluminum-Alloy Sheet and Plate. ASTM-B211 - Aluminum and Aluminum-Alloy Bar, Rod and Wire. ASTM-B221 - Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles and Tubes. (ASTM publications are available from ASTM International, 100 Barr Harbor Drive, Conshohocken, PA 1
12、9428-2959 or from http:/astm.org). NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL) NCSL-Z540.3 - Calibration Laboratories and Measuring and Test Equipment . (Copies of the above document are available at National Conference of Standards Laboratories (NCSL), 2995 Wilderness Place Suite 107, Boul
13、der, CO 80301-5404, United States, or at http:/www.ncsli.org.) SAE INTERNATIONAL (SAE) AEROSPACE MATERIALS SPECIFICATIONS (AMS) SAE-AMS-QQ-P-416- Plating, Cadmium (Electrodeposited). (Society of Automotive Engineering documents are available through SAE INTERNATIONAL, 400 Commonwealth Drive, Warrend
14、ale, PA 15096-0001, http:/www.sae.org.) (Non-Government standards and other publications are normally available from the organizations which prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.4 Order of precedence. U
15、nless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regul
16、ations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the
17、 specification sheet, the latter shall govern. 3.2 Materials. The material for each part shall be as specified herein and in table I. When a definite material is not specified, a material shall be used which will enable the gaskets and the subassemblies to meet the performance requirements of this s
18、pecification (see 6.2.e). Acceptance or approval of any constituent material shall not be construed as a guaranty of acceptance of the finished product (see 4.6.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24211C 3 TABLE I. Component m
19、aterials inspection. Component material Requirement paragraph Applicable documentAluminum-base alloys: 3.2.1 - Bar stock and forging 3.2.1.1 ASTM-B221 or B211 Sand casting 3.2.1.2 ASTM-B26/B26M/ANS-H35.1 Die casting 3.2.1.3 ASTM-B85/B85M, B26/B26M or B108/B108M Permanent mold casting 3.2.1.4 AST M-B
20、108/B108M Sheet 3.2.1.5 ASTM-B209 Silicone rubber 3.2.2 A-A-59588 Plating 3.3.1 SAE-AMS-QQ-P-416 3.2.1 Aluminum-base alloys. 3.2.1.1 Bar stock and forging. When fabricated from bar stock or by forging, gaskets shall be made of an aluminum alloy conforming to alloy 6061 of ASTM-B221 or ASTM-B211; bar
21、 stock shall be temper T6. 3.2.1.2 Sand casting. When fabricated by sand casting, gaskets shall be made of aluminum alloy conforming to ANSI-H35.1 alloy designation alloys 295.0, condition T4; alloy 208.0, condition F; or alloy 712.0, condition T5 of ASTM-B26/B26M. 3.2.1.3 Die casting. When fabricat
22、ed by die casting, gaskets shall be made of aluminum alloy conforming to ASTM-B85/B85M, ASTM-B26/B26M or ASTM-B108/B108M. 3.2.1.4 Permanent mold casting. When fabricated by permanent mold casting, gaskets shall be made of an aluminum alloy conforming to alloy 356.0, condition T6 or alloy 355.0, cond
23、ition T6 of ASTM-B108/B108M. 3.2.1.5 Sheet. When fabricated from sheet aluminum, the alloy shall conform to ASTM-B209. 3.2.2 Rubber compound. The rubber compound for the gaskets shall be silicone rubber, class 2A, grade 60, in accordance with A-A-59588. 3.2.3 Dissimilar metals. Unless suitably prote
24、cted against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other (see 6.4.1). This pertains to different metals within the gaskets themselves, as well as to gasket metals in contact with waveguide flange metals. Waveguide flange metal materials are identif
25、ied in MIL-DTL-3922. 3.3 Interface and physical dimensions. Gaskets shall be of the design, interface and physical dimensions specified (see 3.1 and 4.6.1). 3.3.1 Plating. The metal alloy (see 3.7) used shall have equivalent form, fit, functional performance and corrosion resistance as cadmium plate
26、, type I class 2, in accordance with SAE-AMS-QQ-P-416, of sufficient density to withstand the salt spray (corrosion) test in 4.6.3 without evidence of corrosion or pitting. Plating must be accomplished prior to molding the rubber to the metal. 3.4 Seal. When tested as specified in 4.6.4, gaskets sha
27、ll show no air leakage. 3.5 Radio Frequency (RF) leakage. When tested as specified in 4.6.5, RF leakage shall be at least 100 decibels (dB) below the transmitted power at the gasket. 3.6 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Ti
28、n content of waveguide flange gasket components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.6). 3.7 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials sh
29、ould be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. All components supplied shall be new and unused. Provided by IHSNot for ResaleNo reproduction or networking p
30、ermitted without license from IHS-,-,-MIL-DTL-24211C 4 3.8 Workmanship. Gaskets shall be processed in such a manner as to be representative of controlled Industrial techniques, and all surfaces shall be free from burrs, die marks, chatter marks, scratches, dirt, grease, scale, splinters, and other d
31、efects that will affect life, serviceability, or appearance. 4. VERIFICATION 4.1 Test equipment and inspection facilities. Test equipment and inspection facilities shall be of sufficient accuracy, quality, and quantity to permit performance of the required inspection. The manufacturer shall establis
32、h and maintain calibration of inspection equipment to the satisfaction of the Government. Calibration of the standards which control the accuracy of inspection equipment shall comply with the requirements of NCSL-Z540.3. 4.2 Classification of inspections. The inspection requirements specified herein
33、 are classified as follows: a. Component materials inspection (see 4.3). b. Conformance inspection (see 4.5). (1) Inspection of product for delivery (see 4.5.1). 4.3 Component materials inspection. Materials inspection shall consist of verification that the component materials (see 3.2 through 3.2.2
34、, 3.3.1, 3.7, 4.6.1 and table I) used in fabricating the waveguide gaskets, are in accordance with the applicable referenced specifications or requirements prior to such fabrication (see 3.7). 4.4 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accorda
35、nce with the test conditions specified in MIL-STD-202. 4.5 Conformance inspection. 4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B inspections. 4.5.1.1 Inspection lot. An inspection lot, as far as practicable, shall consist of all the
36、 gaskets of the same part number, produced under essentially the same conditions and offered for inspection at one time. 4.5.1.2 Rejected lots. If an inspection lot is rejected, the manufacturer may withdraw the lot, rework it to correct the defects, or screen out the defective units, as applicable,
37、 and re-inspect. Such lots shall be kept separate from new lots and shall be clearly identified as re-inspected lots. Rejected lots shall be inspected using tightened inspection. 4.5.1.3 Group A inspection. Group A inspection shall consist of the examinations specified in table II; all group A exami
38、nations shall be made on the same set of sample units. TABLE II. Group A inspection. Examination Requirement paragraph Method paragraph Visual and mechanical - 4.6.1 Material 3.1, 3.2, through 3.2.2, 3.3.1 4.3, 4.6.1 Interface 3.1, 3.3 and 3.3.1 4.6.1 Workmanship 3.8 4.6.1 4.5.1.3.1 Sampling plan. S
39、tatistical sampling and inspection shall be performed on an inspection lot basis with a random sample of gaskets selected in accordance with table III. The acceptance levels shall be based upon the zero defective sampling plan. No failures shall be permitted. Provided by IHSNot for ResaleNo reproduc
40、tion or networking permitted without license from IHS-,-,-MIL-DTL-24211C 5 TABLE III. Group A sampling plan. Lot size Sample size 1-13 14-150 151-280 281-500 501-1200 1201-3200 3201-10,000 10,001-35,000 35,001-150,000 150,001-500,000 500,001 and over 100 percent 13 20 29 34 42 50 60 74 90 102 4.5.1.
41、3.2 Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct the defects, or screen out the defective units, and resubmit for re-inspection to the table III sampling plan. Such lots shall be separate from new lots, and shall be clearly identified as re-inspected lots.
42、 If one or more defects are found in the second sample, the lot is rejected and shall not be supplied to this specification. (NOTE: This corrective action applies to the original defect found. If another defect type is found in the second sample, a re-screen for that defect is also permitted.) 4.5.1
43、.4 Group B inspection. Group B inspection shall consist of the tests specified in table IV. TABLE IV. Group B inspection. Test Requirement paragraph Method paragraph Rubber adhesion 3.2.2 4.6.2 Salt atmosphere (corrosion) 3.3.1 4.6.3 Seal 3.4 4.6.4 RF leakage 3.5 4.6.5 4.5.1.4.1 Sampling plan. For t
44、he purpose of group B inspection, gaskets shall be in two size groups as listed in table V. Group B inspection shall be performed on one sample per size group and inspection of one sample gasket in a group shall fulfill the group B inspection requirements for the entire group. Inspection shall be pe
45、rformed on a particular size group semi-annually if the manufacturer has been awarded a contract or order for a gasket in that group. Table V. Group B inspection size groups. Group I - X-band and smaller Group II - Larger than X-band M24211/1-001 M24211/2-001 M24211/1-002 M24211/2-002 M24211/1-003 M
46、24211/2-003 M24211/1-004 M24211/2-004 M24211/1-005 M24211/2-005 M24211/1-006 M24211/2-006 M24211/2-009 M24211/2-007 M24211/2-010 M24211/2-008 M24211/2-011 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24211C 6 4.5.1.4.2 Noncompliance. If a
47、sample fails to pass group B inspection, the manufacturer shall take corrective action on the materials, process, or both, as warranted, and on all units of product which can be corrected and which were manufactured under essentially the same conditions, with essentially the same materials, and proc
48、esses, and which are considered subject to the same failure. Acceptance of the product shall be discontinued until corrective action, acceptable to the Government, has been taken. After the corrective action has been taken, group B inspection shall be repeated on additional sample units (all inspect
49、ion, or the inspection which the original sample failed, at the option of the government). Group A inspection may be re-instituted; however, final acceptance shall be withheld until the group B inspection has shown that the corrective action was successful. 4.5.1.4.3 Disposition of samples. Sample units which have been tested under the group B inspection shall not be delivered on the cont
