1、MIL-R-2307LIC 73 777770b 0433bLt2-7 W LI“-POUNDI MIL-R-23074C(SH) 22 May 1990 SUPERSEDING 27 November 1964 (See 6.7) MIL-R-23074B(SHIPS) MILITARY SPECIFICATION RUBBER TILE, RUBBER-AIR-LEAD-TYPE (RAL) This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and
2、 is available or use by all Departments and Agencies of the Department of Defense, 1. SCOPE 1.1 Scope. This specification covers rubber tile used for reducing the transmission of vibration from metal plates to water. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards,
3、and handbooks. The following specifica- tions, standards, and handbooks 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 Defence Index of Specifications and Standards (DODISS) and
4、 supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL PPP-F-320 - Fiberboard; Corrugated and Solid, Sheet Stock PPP-B-636 - Boxes, Shipping, Fiberboard. (Container Grade), and Cut Shapes. MILITARY MIL-L-19140 - Lumber and Plywood, Fire-Retardant Treated. MIL-A-24456 - Adhe
5、sive or Plastic Vibration-Damping Tiles. Commander, Naval. Sea Systems Command, SEA 5523, Department of the Navy, nt Proposal (BD Form 1426) appearing at the end o this document or M4SC M/A FSC 9320 1. Approved for public release; distribution is unlimited. Licensed by Information Handling Services_
6、I_ _I- MIL-R-23074C 93 W 7997706 0433643 7 W MIL-R-23074C(SH) STANDARDS FEDERAL FED-STD-601 - Rubber Samplin and Testing. MILITARY MIL-STD-407 MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking and MIL-STD-2073-1 - DoD Materiel Procedures for Development and -. Visual Inspection Guide for Rubbe
7、r Molded Items. Waterproofing; With Appropriate Test Methods. Application of Packaging Requirements. (Unless otherwise indicated, copies of federal and military specifications, ,standards, and handbooks are available from the Standardization Documents Order Desk, BLDG. 4D, 700 Robbins Avenue, Philad
8、elphia, PA 19111-5094.) 2.2 Non-Government Dublications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. documen
9、ts not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise specified, the issues of AMERICAN SOCIETY FOR TESTING WD MATERIALS (ASTM) D 412 - Standard Test Methods for Rubber Properties in Tension. D 471 - Standard Test Method for Rubber Property
10、 - Effect of D 945 - Standard Test Methods for Rubber Properties in Compression D 2240 - Standard Test Method for Rubber Property - Durometer D 3951 - Standard Practice for Commercial Packaging, (DoD adopted) Liquids. (DoD adopted) or Shear (Mechanical Oscillograph). (DoD adopted) Hardness. (DoD ado
11、pted) (DoD adopted) (Application for 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 prepare or distribute
12、 the documents. may be available in or through libraries or other informational services.) 2.3 Order of Drecedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence, Nothing in this document, however, supersedes
13、applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Materials, The tile shall be an assembly of rubber and lead shot having the specified construction, and vulcanized to have the specified properties. The rubber shall be polymerized chloroprene compound
14、ed 2 Licensed by Information Handling ServicesMIL-R-23074C 73 W 974770b 0433644 O W . 3.2 Construction. Unless otherwise specified (see 6.2), the tile shall have the construction and dimensions shown on figure 1. with the base sheet face and the four edges roughened by abrading so that no further pr
15、ocessing except solvent cleaning and cement application is required for adherence to steel. The cover sheet and the base sheet of the tile shall be made from the same compound, The tile shall be furnished 3.3 Lead shot. The lead shot shall have a specific gravity between 10.9 and 11.4 and a diameter
16、 between 0.080 and 0.095 inch (number 8 shot). 3.4 Airtirrhtness. The tile shall show no blisters or indication of leakage (see 4.3.1). 3.5 Phvsical DroDerties. The lead content and rubber in the tile shall conform to the requirements specified in table I (see 4.4). TABLE I. Physical requirements. L
17、ead shot content in tile, grams Adhesion, tile to steel and cover to tile base, initially, after oven aging and after water immersion, stripping in 3 minutes caused by 20-pound load, inches Initial properties of rubber: Static modulus, pounds per square inch ( lb/in2) Dynamic modulus, lb/in2 Resilie
18、nce, percent Hardness, durometer points Tensile strength, lb/in2 Ultimate elongation, percent Oven aged properties of rubber: Tensile strength, percent of initial Ultimate elongation, percent of initial Properties after water immersion: Volume change, percent Maximum 960 3 840 1,240 84 57 - - - - 12
19、 Minimum 860 - 700 920 70 47 1,400 350 80 80 O Test procedure 4.4.1 4.4.2 4.4.3 4.4.3 4.4.3 4.4.4 4.4.5 4.4.5 4.4.5.1 4.4.5.1 4.4.6 3 Licensed by Information Handling Services- MIL-R-23074C 73 W 777770b 04336115 2 3.6 Markinp. The tile shall be marked in colored ink with the manufac- turers name or
20、tradehark, the month and year of manufacture, contract number, and specification number. 3.7 Workmanship. ments of this specification. The finished item shall meet all the applicable require- 4. QUALITY ASSURANCE PROVISIONS 4.1 ResDonsibilitv for inspection. Unless otherwise specified in the contrac
21、t 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 his own or any other facilities suitable for the performance of
22、the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.
23、1 Resuonsibilitv for comDliance. 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. The absence of any inspection requirements in the specification shall not re
24、lieve 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 acceptable practice to ascertain conformance to requiremen
25、ts, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.2 ualitv conformance insuection. 4.2.1 W. For purposes of sampling, examinations, and tests, a lot shall consist of all the tile
26、produced in one plant under essentially the same condi- tions, but not to exceed 1000 titles. the lot size, In each case, the number of pieces shall be 4.2.2 SamDline;. 4.2.2.1 SamDline: for visual. dimensional and airtightness examinations. Sample tiles shall be taken at random from each lot in acc
27、ordance with the sampling plan in table II for the examinations specified in 4.3.1 (see 6,4). 4 Licensed by Information Handling ServicesMIL-R-Z307-IC 73 W 777770b 0433b116 4 W MIL-R-23074C(SH) TABLE II. SamDlinP for visual, dimensional and airtightness - examinations. Lot size Sample size Number of
28、 Number of rubber rubber tiles 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 all 5 8 13 20 32 50 80 4.2.2.1.1 Maior defect. A major defect is a defect that is likely to result in failure or to reduce materially the usability of the unit of product for its int
29、ended purpose, 4.2.3 SamDlina for tests. Sample tiles shall be taken at random from those selected in 4.2.2.1 in sufficient quantity to conduct the tests specified in 4.3.2.1. 4.2.3.1 Additional rubber samples for test, The manufacturer shall prepare two sheets, each 6 by 6 by 0.080 2 0.010 inch thi
30、ck, and one slab 4 by 4 by 0.500 inch thick from each lot. These pieces shall be identical in cure and composition to the rubber material in the lot submitted (see 6.3). The tests specified in 4.3.2.2 shall be conducted on these rubber samples. 4.3 Oualitv conformance examinations and tests. 4.3.1 V
31、isual, dimensional, and airtightness examinations. Each of the samples taken in accordance with 4.2.2.1 shall be subjected to an examination for workmanship, dimensions, tolerances and airtightness. to determine and evaluate defects through visual examination. airtightness shall be conducted as foll
32、ows: MIL-STD-407 shall be used The examination for (a) A single layer of tiles shall be placed on the platen of a press or between hot plates maintained at 310 degrees Fahrenheit (OF) and arranged to close as specified below, the lowest pressure that can be maintained against 1/2-inch thick spacer b
33、ars. (b) The press or the hot plates shall be closed against the tiles at 5 Licensed by Information Handling ServicesMIL-R-23074C 73 W 777790b 0433647 b W (c) Two minutes after placing the tiles on the hot surface, the pressure shall be released and the heated tiles removed as rapidly as possible. c
34、ross light the patterned surface. exhibit a symmetrical pattern of raised areas over each hole, Areas that are not raised over the holes indicate leakage, Blisters that destroy the symmetry indicate faulty bonding within the tile. leakage shall be rejected and classified as a major defect. (d) Each
35、heated tile shall be examined by picking it up and tilting to Tile that is airtight will Any tile exhibiting such blisters or indication of 4.3.1.1 Reiection. Any defective tile shall not be offered for delivery (see 6.4). 4.3.2 uality conformance tests. 4.3.2.1 Tests on the tile. be subjected to th
36、e following tests: Each sample taken in accordance with 4.2.3 shall - Test Paragraph Content of lead shot 4.4.1 Adhesion, initial, after oven aging and 4.4.2 after water immersion tile to steel and cover to base of tile 4.3.2.2 Tests on rubber samples. Each sample provided in accordance with 4.2.3.1
37、 shall be subjected to the following tests: Test ParagraDh - -. Static modulus, dynamic modulus, and resilience 4.4.3 Hardness, Shore A durometer 4.4.4 Tensile strength, initial and after 4.4.5 oven aging Ultimate elongation, initial and after 4.4.5 oven aging Volume change 4.4.6 4.3.2.3 Reiection f
38、or nonconformance. If any sample is found not to conform to the requirements of this specification, this shall be cause for rejection of the lot which it represents, 4.4 Test procedures. Unless otherwise indicated in the test procedure, tests shall not be conducted on the test specimens unless a conditioning period of 4 hours at room temperature 27 l7W - 7W34 13 Licensed by Information Handling Services
