1、 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Doc
2、ument Improvement Proposal (DD Form 1426) appearing at the end of this document or by 15 September 1988 SUPERSEDING 1 December 1965 (See 6.8) MIL-T-24180(SHIPS) MILITARY SPECIFICATION TILE, RUBBER, UNDERWATER ACOUSTIC DECOUPLER This specification is approved for use by the Naval Sea Systems Command,
3、 Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification lists the requirements for rubber tile to be used for reducing the transmission of vibration from metal structures to water, and for reflecting under
4、water sound. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. otherwise specified, the issues of these documents are those listed in the issue of the Departmen
5、t of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). Unless SPECIFICATIONS FEDERAL PPP-B-636 - Boxes, Shipping, Fiberboard. PPP-F-320 - Fiberboard: Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes. letter. / - FSC
6、 9320 THIS DOCUMENT CONTAINS i5 PAGES. AMSC N/A DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A MI LI TARY MIL-L-19140 - Lumber and Plywood, Fire-Retardant Treated. M
7、IL-P-24441 - Paint, Epoxy-Polyamide General Specification for. MIL-P-24441/1 - Paint, Epoxy-Polyamide, Green Primer, Formula 150, Type I. MIL-P-24441/2 - Paint, Epoxy-Palyamide, Exterior Topcoat, Haze Gray, Formula 151, Type I. MIL-P-24441/3 - Paint, Epoxy-Polysmide, Topcoat, White, Formula 152, Typ
8、e I. MIL-A-24456 - Adhesive for Plastic Vibration-Damping Tiles. STANDARDS MI LI TARY MIL-STD-407 MIL-STD-2073-1 - DoD Materiel Procedures for Development and - Visual Inspection Guide for Rubber Molded Items. Application of Packaging Requirements. (Unless otherwise indicated, copies of federal and
9、military specifications and standards are available from the Naval Publications and Forms Center (ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise spec
10、ified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2), AMERICAN SOCIETY FOR TESTI
11、NG AND MATERIALS (ASTM) D 412 - Standard Test Methods for Rubber Property in Tension. D 413 - Standard Test Methods for Rubber Property - Adhesion to D 471 - Standard Test Method for Rubber Property - Effect of D 573 - Standard Test Method for Rubber - Deterioration in an Air D 945 - Standard Test M
12、ethods for Rubber Properties in Compres- D 2240 - Standard Test Method for Rubber Property - Durometer D 3951 - Standard Practice for Commercial Packaging. (DoD adop led) Flexible Substrate, (DoD adopted) Liquids. (DoD adopted) Oven. (DoD adopted) sion or Shear (Mechanical Oscillograph). (DoD adopte
13、d) Hardness, (DoD adopted) (DoD adopted) (Application fur copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from These documents also the organizations that
14、prepare or distribute the documents. may be available in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3 MIL-T-24LBOA 73 M 7777706 OLL85LB 7 M 2.3 Order of precedence. In the event of a confl
15、ict between the text of this document and the references 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. REQUIREMENTS 3.1 First article. When specified (see 6.2),
16、 a sample shall be subjected to first article inspection (see 6.4) in accordance with 4.3. 3.2 Materials. The rubber shall be polymerized chloroprene compounded and vulcanized to have the specified properties. 6.5. A suggested formulation is given in 3.2.1 Recovered materials. Unless otherwise speci
17、fied herein, all material incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have
18、 been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified.
19、3.3 Construction. The tile shall have the construction and dimensions The face of the base sheet and all four edges of the tile shall be shown on figure 1. 6.2). roughened by buffing or sanding so that no further processing is required for adhesion to steel except solvent cleaning and cement applica
20、tion. (outer) face (cover sheet) of the tile shall be marked in colored ink with the manufacturers name or trademark, the month and year of manufacture, contract number and specification number. Tiles other than 12 by 12 inches shall be as specified (see The other 3.4 WeiEht. The tile shall weigh 2.
21、8 5 0.2 pounds. 3.5 Airtiphtness. The tile shall show no blisters or indication of leakage (see 4.5.1). 3.6 Adhesion of components. A load of 20 pounds shall not separate at a rate greater than 1 inch per minute the cover from the base tile or the tile from the preserved steel surface before aging,
22、after oven aging, and after water immersion (see 4.6.1). 3.7 Properties of rubber. The rubber in the tile shall conform to the requirements specified in table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE I. Physical requirements of rubber
23、, Physical properties Mechanical properties under compression: Static modulus, lb/in2 Dynamic modulus, lb/in2 Resilience, percent Tensile strength, lb/in2 Decrease after oven aging, percent Ultimate elongation, percent Decrease after oven aging, percent Durometer hardness Volume swell after water im
24、mersion, percent Maximum 1,030 1,620 - - 20 - 20 65 6 Minimum 2,500 - 450 - 55 O Test 4.6.2 4.6.3 4.6.3.1 4.6.3 4.6.3.1 4.6,4 4.6.5 3.8 Workmanship. The finished item shall be clean, well made and free from defects which may affect the serviceability. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibili
25、ty for inspection. Unless otherwise Specified in the contract: or: purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use hi
26、s own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Goverrment reserves the right to perform any of the inspections set forth in this speciication where such inspections are deemed necessary to ensure s
27、upplies and services conform to prescribed requirements. 4.1.1 ResDonsibilitv for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. absence of any
28、inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of the manufacturing operations, is an a
29、cceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. The 4.2 Classification of inspections. The inspection requirements specifi
30、ed herein are classified as follows: (a) (b) First: article inspection (see 4.3). Quality conformance inspection (see 4.4). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24LBOA 73 M 7749706 OLL8520 7 M 4.3 First article inspection. First ar
31、ticle inspection shall consist of the examination of 4.5.1 and tests of 4.6. The inspection material shall consist of a sample identical in composition and equivalent in cure to the material to be provided for quality conformance inspection (see 6.3). shall conform to the requirements specified in t
32、his specification. First article tests shall be monitored by a Government representative. not proceed with production without receiving written approval from the contracting activity (see 6.3). The first article sample The contractor shall 4.4 Qualitv conformance inspection. Quality conformance insp
33、ection shall consist of the examinations and tests specified in 4.5. 4.4.1 Sampling - for qualitv conformance. 4.4.1.1 _Lot. Tiles of the same dimensions and made of the same compound and offered for delivery at one time shall be considered a lot for purposes of sampling and inspection. size. In eac
34、h case the number of pieces shall be the lot 4.4.1.2 Sampling for visual, dimensional and airtightness examinations. Sample tiles shall be taken at random from each lot in accordance with the sampling plan in table II for the examinations specified in 4.5.1. TABLE II. Sampling for visual. dimensiona
35、l and airtightness examinations. Lot size Number of rubber tiles 1 to 4 5 to 9 10 to 25 26 to 62 63 to 160 161 to 410 411 to 1,000 1,001 to 2,600 Sample size Number of rubber tiles All 5 8 13 20 32 50 80 Number of nonconforming or defective rubber tiles Major defects Acceptance number Rej ection num
36、ber Total defects (major plus minus) Accep tance number Rejection number 4.4.1.2.1 A major defect is a defect that is likely to result in failure, or to rsduce materially the usability of the unit of product for its intended purpose. 4.4.1.3 Sampling for destructive tests. Sample tiles shall be take
37、n at random from those selected in 4.4.1.2 in sufficient quantity to conduct the tests specified in 4.5.2.1 or 4.5.3.1, as applicable. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4,1.3.1 Additional rubber samples for test, Two sheets, each 6
38、by 6 by 0.080 5 0.010 inch thick and one slab 4 by 4 by 0,500 inch thick shal be furnished with each lot. applicable, shall be conducted on these rubber samples. The tests specified in 4.5.2.2 and 4.5.3.2, as 4.5 guality conformance examinations and tests. 4.5.1 Visual, dimensional, and airtightness
39、 examinations. Each of the samples taken in accordance with 4.4.1.2 shall be subjected to an examination for workmanship, dimensions, tolerances and airtightness. MIL-STD-407 shall be used to determine and evaluate defects through visual examination. The examination for airtightness shall be conduct
40、ed as follows: (a) Place a single layer of tiles on the platen of a press or between hot plates maintained at 152.9 degrees Celsius (OC) (310 degrees Fahrenheit (OF), and arranged to close as specified below. Close the press or the hot plates against the tiles at the lowest pressure which can be mai
41、ntained against 1/2-inch thick spacer bars. Two minutes after placing the tiles on the hot surface, release the pressure and remove the heated tiles as rapidly as possible. Examine each heated tile by picking it up and tilting to cross light the patterned surface, a symmetrical pattern of raised are
42、as over each hole. which are not raised over the holes indicate leakage. Blisters which destroy the symmetry indicate faulty bonding within the tile. shall be rejected and classified as a major defect. (b) (c) (d) Tile which is airtight will exhibit Areas Any tile exhibiting such blisters or indicat
43、ion of leakage 4.5.1.1 Rejection. Any defective tile shall not be offered for delivery. If the number of defective tiles in any sample exceeds the applicable acceptance number shown in table II, this shall be cause for rejection of the lot represented by the sample. 4.5.2 gualitv conformance tests,
44、4.5.2.1 Tests on the tile, Each sample taken in accordance with 4-4.1.3 shall be subjected to the following tests: - Test Test urocedure Adhesion, initial Cover to base of tile 4.6.1.1 Tile to steel 4.6.1.2 4.5.2.2 Tests on rubber samDles. Each sample selected in accordance with 4,4.1,3,1 shall be s
45、ubjected to the following tests: 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-243OA 73 m 777770b 0338522 O W - Test Test procedure Static modulus, dynamic modulus and resilience 4.6.2 Tensile strength, initial 4.6.3 Ultimate elongation, in
46、itial 4.6.3 Hardness, Shore A durometer 4.6.4 4.5.2.3 Reiection for nonconformance. If any of the samples is found not to conform with the requirements of this specification, this shall be cause for rejection of the lot which it represents. 4.5.3 Production check tests. Production check tests shall
47、be conducted on the first lot of material offered for delivery under a contract or order and on every fifth lot thereafter. 4.5.3.1 Tests on the tile. Each sample taken in accordance with 4.4.1.3 and shall be subjected to the following tests: Test Test procedure Adhesion, after oven aging Cover to b
48、ase of tile 4.6.1.1.1 Tile to steel 4.6.1.2.1 4.5.3.2 Tests on rubber samples. Each sample selected in accordance with 4.4.1.3.1 shall be subjected to the following tests: - Test Test procedure Tensile strength, after Ultimate elongation, after oven aging 4.6.3.1 oven aging 4.6.3.1 4.5.3.3 Reiection
49、. If any production check test sample is found to be not in conformance with this specification, this shall be cause for rejection of the lot which it represents. Furthermore, additional samples shall be selected from (or to represent) each subsequent lot and shall be subjected to the test or tests wherein failure occurred. completion of the test or tests by all the samples selected to represent the lot. This additional testing shall be discontinue
