1、fiIL-fl-L7508F 53 999990b.Ollb507b b MILITARY SPECIFICATION -1 MIL“-175aF(SH) 12 December 1990 SUPERSEDING 2 August 1971 (see 6.9) MIL“-17508E(SHIPS) MOUNTS, RESILIENT: TYPES 6E100, 6E150, 73450, 6E900, 6E2000, 533500, 6J3100BBY 6E150BBY 7E450BB, AND 6E900BB Th distribution is unlimited. Provided by
2、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-13.1.1 The numbers and letters in the type designation denote the following: First number - Denotes the resonance frequency (hertz) in the axial direction at Letter E - Denotes the mount design activity (Naval Shi
3、p Research and Last number - Denotes the upper load rating (pounds) Letters BB - Denotes that the mount is designed in a back-to-back upper rated load Development Center) configuration. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications
4、 and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see
5、6.2). SPECIFICATIONS FEDERAL PPP-F-320 QQ-S-781 MILITARY MIL-P-116 MIL-L-19140 STANDARDS MILITARY MIL-STD-407 MIL-STD-1186 MIL-STD-2073/1 Fiberboard: Corrugated and Solid Sheet Stock (Contain Grade) and Cut Shapes Strapping, Steel, and Seals Preservation, Methods of Lumber and Plywood, Fire Retardan
6、t Treated Visual Inspection Guide for Rubber Molded Items Cushioning, Anchoring, Bracing, Blocking, and Waterproofing, with Appropriate Test Methods DOD Material Procedures for Development and Application of Packaging Requirements 2 Provided by IHSNot for ResaleNo reproduction or networking permitte
7、d without license from IHS-,-,-MIL-M-17508F 53 9 999990b 04b5078 T m (Unless Othe EES Type (Copies of drawing required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Non-Government pub
8、lications. The following documents form a part of this specification 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. Unless otherwise specified, the issues of document
9、s not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (AST“) D 395 Standard Test Methods for Rubber Property - Compression Set; (DOD adopted) D 412 Standard Test Methods for Rubber Properties in Tension; (DOD adopte
10、d) D 429 Standard Test Methods for Rubber Property - Adhesion to Rigid Substrates; (DOD adopted) D 471 Standard Test Method for Rubber Property - Effect of Liquids D 573 D 792 t Standard Test Method for Rubber - Deterioration in an Air Oven; (DOD adopted) Standard Test Methods for Specific Gravity a
11、nd Density of Plastics by Displacement 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL”-17508F(SH) D 1005 Measurement of Dry-film Thickness of Organic Coatings Using Micrometers, Standard Test Methods for; (DOD adopted) D 1149 Standard Test Met
12、hod for Rubber Deterioration - Surface Ozone Cracking in a Chamber (Flat Specimen) D 1186 Standard Methods for Nondestructive Measurement of Dry Film Thickness of Non-Magnetic Coatings Applied to a Ferrous Base; (DOD adopted) D 1229 Standard Test Method for Rubber Property - Compression Set at Low T
13、emperatures; (DOD adopted) D 1400 Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a Nonferrous Metal Base, Standard Test Method for D 2231 Standard Test Method for Evaporation Residue of Naphthalene D 2240 Standard Test Method for Rubber Property - Durometer Har
14、dness D 3951 Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) ACOUSTICAL SOCIETY OF AMERICA ASA 31 Experimental Determination of Mechanical Mobility Part I Basic Defini
15、tions and Transducers, Methods for ASA 32 Experimental Determination of Mechanical Mobility Part II: Measurement Using Single-Point Translational Excitation, Methods for (Applications for copies should be addressed to the Acoustical Society of America, 335 East 45th Street, New York, NY 10017.) INTE
16、RNATIONAL ORGANIZATION FOR STANDARDIZATION IS0 2856 Elastomers - General Requirements for Dynamic Testing Second Edition 4 J Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-L750BF 53 W 999990b 04b5080 B W MIL”-17508F(SH) (Applications for copie
17、s should be addressed to the International Organization for Standardization, 1 rue de Varemde, Geneve, Switzerland.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or th
18、rough libraries or other informational services.) 23 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specification takes precedence.
19、 Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The mounts furnished under this specification shall be products which are authorized by the qualified activity for applicable qualified pro
20、ducts list at the time of award of contract (see 4.3 and 6.3). 3.2 Definitions. Definitions for axial direction and radial direction shall be as follows: 3.2.1 Axial direction. Tests specified in the axial direction shall be interpreted to mean a direction which is parallel to the center bolt axis o
21、f the mount. When the mount is in service, the axial direction is normally the vertical direction. 3.2.2 Radial direction. Tests specified in the radial direction shall be interpreted to mean a direction which is perpendicular to the center bolt axis of the mount. When the mount is in service, the r
22、adial direction is normally the horizontal direction. 3.3 Materials. Materials shall be as follows: 33.1 Metal. The metal components of the mounts shall be of material equivalent to that specified on the drawings for the mounts. The contracting activity shall specify (see 6.2) whether the mounts are
23、 to be manufactured from steel or manganese bronze as shown on Drawing 803- 1385778. The metal components for the mounts shall be formed to shape and finished in accordance with the dimensions and allowable tolerances specified by the applicable mount drawing. 33.2 Rubber. 33.2.1 Resilient element.
24、The resilient elements of the 7E450, 6E900, 6E2000, 7E450BB, and 6E900BB mounts shall be fabricated of oil resistant compounds utilizing polymerized chloroprene (see 6.4) as the basic material. The resilient elements of the 6E100, 6E150, 5E3500, 6E100BB, and 6E150BB mounts shall be molded from compo
25、unds using natural rubber (see 6.4) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-tlIL-fl-17SOBF 53 9999qOb 04b5081 T as the basic material. The natural rubber components shall be coated with an oil-ozone resistant compound (see 6.5). Coating of
26、the mounts may be accomplished by, but is not limited to, dipping, painting, or spraying. The mounts shall be molded to the specified form as shown on Drawing 803-1385778. 33.2.1.1 Porosity and delamination. The rubber elements of the furnished mounts shall have no delamination, air pockets, or poro
27、sity in any portion when tested in accordance with 4.6.17. 33.2.1.2 Bond. The rubber elements shall be bonded to the metal components as specified on Drawing 803-1385778. 33.2.13 Surface condition. There shall be no backrinding nor blisters on the outer surfaces of the rubber elements of the finishe
28、d mounts. 33.2.1.4 Physical requirements. 33.2.1.4.1 Rubber compounds., The vulcanized rubber compounds used in the resilient elements of the mounts shall be in accordance with the physical requirements specified in table I. 33.2.1.4.2 Hardness. The hardness of the rubber compounds used in the resil
29、ient elements shall be determined in accordance with 4.6.10. The hardness found during qualification inspection of the mount compounds shall be recorded as a requirement with a tolerance of plus or minus 5 points for subsequent quality conformance testing of the mount compounds. 33.2.1.43 Specific g
30、ravity. The specific gravity of the rubber compounds used for the resilient elements shall be determined in accordance with 4.6.11. The specific gravity found during qualification inspection of the mount compounds shall be recorded as a requirement with a tolerance of plus or minus 0.02 for subseque
31、nt quality conformance testing of the mount compounds. 33.2.1.4.2 Hardness. The hardness of the rubber compounds used in the resilient elements shall be determined in accordance with 4.6.10. The hardness found during qualification inspection of the mount compounds shall be recorded as a requirement
32、with a tolerance of plus or minus 5 points for subsequent quality conformance testing of the mount compounds. 33.2.1.43 Specific gravity. The specific gravity of the rubber compounds used for the resilient elements shall be determined in accordance with 4.6.11. The specific gravity found during qual
33、ification inspection of the mount compounds shall be recorded as a requirement with a tolerance of plus or minus 0.02 for subsequent quality conformance testing of the mount compounds. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flfL-fl-L7508F
34、53 = 9999906 04b5082 I, MIL”-17508F(SH) TABLE I. Physical requirements for rubber compounds. Tensile strength (min), lb/ln2 Before aging After aging 46 hours at 194 F Elongation at break (min), percent Before aging After aging 46 hours at 194 “F Compression set (max), percent after aging 46 hours at
35、 194 F Cold compression set (max), percent Volume change in oil (max), percent Adhesion of rubber to metal (min), lb/ln2 Type 6E100, 6E100BB mounts 2200 2100 550 500 30 U) - 400 Resilient elements Type 6E150, 5E3500, 6E150BB mounts 3200 2600 500 450 35 20 - 500 Type 7E450BB mounts 2200 2100 600 550
36、37 50 15 450 Type 6E900, 6E900BB, 6E2000 mounts r Test method 4.6.2 4.6.4 4.6.2 4.6.4 4.6.3.1 4.6.3.2 4.65.1 4.6.6.1 33.2.1.4.4 Oil-ozone resistant coating. The oil-ozone resistant coating shall be in accordance with the physical requirements specified in table II (see 6.5). 7 Provided by IHSNot for
37、 ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-fl-L750BF 53 m 9999906 01.165083 3 m MIL“-17508F(SH) TABLE II. Physical requirements fot oil-resistant coating. Pmperties of dried film Tensile strength (min), lbb2 Elongation at break (min), percent Properties of coate
38、d test specimens Volume change (mm) after immersion in oil at 158 “F for 70 hours, percent Adhesion of coating Before immersion in oil After immersion in oil at 158 OF Ozone resistance after 1 week at 104 “F in air containing 100 pphm ozone Flexibility of coating after flexing for 6 cycles to 100 pe
39、rcent elongation Properties of mated mount Appearance Film thickness (min) on rubber element as measured on coated metal. inch Requirement 5 No failures No failures . No cracks No cracks Shall be dry and tack free and free from blisters or other imperfections 0.003 Test 4.6.2 4.6.2 4.6.5.2 4.6.6.2 4
40、.6.6.2 4.6.7 4.6.8 4.4.3.1.2 4.6.9 333 Protective treatment. The metal components and elastomers used in the mounts shall be resistant to or protected against corrosion by seawater, oil, ozone, or other atmospheric conditions encountered in service. Unless otherwise specified (see 6.2), the coating
41、on the metal shall be equivalent to that specified on Drawing 803-1385778 and shall have a minimum dry film thickness of 0.006 inch. 3.4 Requirements for the finished mounts. 3.4.1 Dynamic stiffness. The dynamic stiffness and resonant frequency of the mounts, when tested in the axial direction in ac
42、cordance with 4.6.12, shall be within the specified limits of table III. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-l7508F(SH) TABLE III. the temperature shall be 104 2 2 “F, and the period of exposure shall be 168 hours. Observation mag
43、nification shall be 7X. 4.6.8 Flexibility of the coating. The flexibility of the coated 1 by 6 by 0.080 inch coated rubber specimens specified in table VI shall be determined. Each specimen shall be clamped in a universal test machine and a tensile force applied to elongate the specimen 100 percent
44、at a loading rate of 20 inches per minute. The force shall then be released so that the specimen is no longer elongated. The cycle shall be repeated six times. The coated specimens shall be visually examined and shall exhibit no cracks, breaks, tears, or blisters. 4.6.9 Film thickness of the oil res
45、istant coating. The film thickness of the oil resistant coating as specified in table II shall be measured on the coated steel plates of the mount using a micrometer. The thickness of the steel plate shall be determined before coating and after 0.003 inch of multiple coatings have been applied to th
46、e mount. The difference in the two thickness measurements divided by two shall be the file thickness of the oil resistant coating. In lieu of the . above procedure, the film thickness may also be measured by using a magnetic type thickness gauge in accordance with AST“ D 1186. 4.6.10 Hardness. The h
47、ardness of the 0.50 inch thick specimens representing the rubber components of the mount shall be determined in accordance with ASTM D 2240. A 3-second reading shall be taken to determine conformance with 3.3.2.1.4.2. 4.6.11 Specific gravity. The specific gravity of the rubber compounds used for the
48、 mounts shall be determined on specimens cut from 0.08 by 6 by 6 inch sheets in accordance with AST“ D 792. The average of three determinations shall be reported to determine conformance with 3.3.2.1.4.3. 18 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
49、S-,-,-4.6.12 Dynamic stiffness test. Dynamic stiffness shall be measured for each mount in the axial direction at loads specified in table XII to determine conformance with 3.4.1. Type 6E100BB, 6E150BB, 7E450BB, and 6E900BB mounts shall be tested in the zero preload condition. The methods for determining dynamic stiffness of the mounts are classified into two groups, resonant and nonresonant methods. T
