1、 INCH-POUND MIL-PRF-2912G (SH) 29 September 2004 SUPERSEDING MIL-PRF-2912F (SH) 26 July 1988 PERFORMANCE SPECIFICATION SYNTHETIC RUBBER COMPOUND, ACID AND OIL RESISTANT This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all De
2、partments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the material for lining the battery compartments of submarines and other compartments aboard ships with a synthetic rubber compound which is resistant to battery acid and hydrocarbon oils (see 6.1). 1.
3、2 Classification. The lining material will be the following type: Type II - Synthetic rubber which is applied in the vulcanized state by adhering it to the compartment with adhesive. Note: The Type I material which was included in previous versions of this document is obsolete and has been deleted.
4、2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has
5、 been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. Comments, suggestions, or questions on this document should be addressed to
6、 Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to commandstandardsnavsea.navy.mil, with the subject line “Document Comment“. Since contact information can change, you may want to verify the currency of this a
7、ddress information using the ASSIST Online database at www.dodssp.daps.mil AMSC N/A FSC 9320 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2912G (SH) 22.2 Government documents. 2.2.1 Specifications, standards and handbooks. The following sp
8、ecifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-289 - Visual Inspection Guide for Rubber Sheet Materi
9、al. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch or www.dodssp.daps.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The follow
10、ing other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. BUREAU OF MEDICINE AND SURGERY (BUMED) BUMED INST 6270.8 - Procedures for
11、 Obtaining Health Hazard Assessments Pertaining to Operational Use of a Hazardous Material. (Copies of this document are available online at https:/bumed.med.navy.mil or from Bureau of Medicine and Surgery, Department of the Navy, 2300 E Street, NW, Washington, DC 20372-5300.) NAVAL SEA SYSTEMS COMM
12、AND (NAVSEA) S9510-AB-ATM-010 Rev 2 of 30 July 1992 - Nuclear Powered Submarine Atmosphere Control Manual. (Copies of this document are available from the Naval Sea Systems Command, Code SEA 05Z9, 1333 Isaac Hull Avenue, SE, Stop 5133, Washington Navy Yard DC 20376-5133.) 2.3 Non-Government publicat
13、ions. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM D 412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastome
14、rs -Tension. (DoD adopted) ASTM D 471 - Standard Test Method for Rubber Property - Effect of Liquids. (DoD adopted) ASTM D 572 - Standard Test Method for Rubber - Deterioration by Heat and Oxygen. (DoD adopted) ASTM D 2240 - Standard Test Method for Rubber Property - Durometer Hardness. (DoD adopted
15、) (Copies of these documents are available from www.astm.org or ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA, 19428-2959.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2912G (SH) 32.4 Order of precedence. In the event o
16、f 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 applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (
17、see 6.2), a sample shall be subjected to first article inspection in accordance with 4.4. 3.2 Material. 3.2.1 Physical properties. The material in the Type II lining shall conform to the physical requirements specified in Table I. TABLE I. Physical requirements of rubber compounds. Description Requi
18、rement Test procedure Compatibility No softening or decomposition 4.2.2 Tensile strength, initial, pounds per square inch (lb/in2), minimum 1400 4.6.2 Ultimate elongation, initial, percent minimum 250 4.6.2 Adhesion to steel and between plies, rate of separation under a 15-pound load, inches per min
19、ute, maximum 1 4.6.3 After oxygen pressure aging: 4.6.4 Tensile strength, percent change from initial, maximum 25 4.6.4.1 Ultimate elongation, percent change from initial, maximum 25 4.6.4.1 Adhesion to steel and between plies, rate of separation under a 12-pound load, inches per minute, maximum 1 4
20、.6.4.2 After immersion in acid: 4.6.5 Weight, percent change from initial, maximum 2 4.6.5.1 Tensile strength, percent change from initial, maximum 25 4.6.5.2 Ultimate elongation, percent change from initial, maximum 25 4.6.5.2 After immersion in oil: 4.6.6 Volume, percent change from initial, maxim
21、um 15 4.6.6.1 Tensile strength, percent change from initial, maximum 20 4.6.6.2 Ultimate elongation, percent change from initial, maximum 20 4.6.6.2 Adhesion to steel and between plies, rate of separation under a 12-pound load, inches per minute, maximum 1 4.6.6.3 Plastic flow characteristics: 4.6.7
22、 Original deflection, inches, maximum 0.020 Deflection after 48 hours, inches, maximum 0.028 Increase of deflection after 48 hours, due to plastic flow, inches, maximum 0.010 Hardness, Shore A durometer 50 to 70 4.6.8 3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled, reco
23、vered, or environmentally preferable materials should be used to the maximum extent possible provided that the material Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2912G (SH) 4meets or exceeds the operational and maintenance requirements,
24、 and promotes economically advantageous life cycle costs. 3.3 Construction. Type II material shall be supplied in rolls 36 inches wide minimum and 1/16-inch thick plus 1/32 minus 0-inch thick. Edges shall be straight. 3.4 Workmanship. Workmanship shall be such as to meet all applicable requirements
25、of this specification. Surfaces shall be free of surface voids, tears, rips, cuts and free from all foreign matter that may affect the use of the product. 3.5 Off-gassing. The material shall meet the requirements in the Nuclear Powered Submarine Atmosphere Control Manual, S9510-AB-ATM-010 Rev 2 of 3
26、0 July 1992, for a usage category of Limited (see 4.7 and 6.5). 3.6 Toxicity. The material shall have no adverse effect on the health of personnel when used for its intended purpose. The material shall be assessed by the Navy Environmental Health Center (NAVENVIRHLTHCEN) using the administrative Hea
27、lth Hazard Assessment (HHA). A flowchart for this process can be found as enclosure (1) of BUMEDINST 6270.8. The HHA is a review of the material based on information submitted by the manufacturer, to assess health hazards associated with the handling, application, use and removal of the product. The
28、 material shall not cause any environmental problems during waste disposal (see 4.8 and 6.6). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: (a) First article inspection (see 4.4). (b) Conformance inspection (see 4.5). 4.2 P
29、reparation of samples. First article and conformance inspections of Type II rubber compound shall be performed on a sample prepared as follows: four steel plates shall be prepared for the conformance inspection of the material. Two steel plates shall be prepared for the first article inspection. The
30、 mild steel plates, 12 by 12 by 1/8-inches shall be blasted gray white. Immediately after blasting, one side of each plate shall be coated with GACO N-11 primer or equivalent to prevent re-oxidation. The primer shall be allowed to dry for a minimum of one hour and should be thoroughly dry before pro
31、ceeding with subsequent operations. 4.2.1 For both conformance and first article, a single plate shall be prepared as follows: the plate shall be coated with one coat of accelerated bonding cement, GACO N-29 or equivalent. After the bonding cement has dried, it shall be covered with a 1/16-inch laye
32、r of accelerated putty, GACO N-250 or equivalent. The putty shall be allowed to dry for a minimum of 8 hours. A coat of accelerated bonding cement, GACO N-29 or equivalent shall be applied to the puttied surface and the rubber sheet. A 3-inch wide strip of separating material such as aluminum foil s
33、hall be located between the putty and the rubber sheet along one edge of the plate to facilitate testing of adhesion between the rubber sheet and the putty. The rubber sheet shall be pressed firmly onto the putty surface such that no raised or soft spots occur on the panel. A steel roller may be use
34、d to assure good adhesion. 4.2.2 The three additional plates for conformance and the single additional plate for first article shall be prepared as follows: the plate or plates shall be coated with one coat of accelerated bonding cement, GACO N-29 or equivalent. The rubber sheets for each plate shal
35、l be coated on both sides with accelerated bonding cement, GACO N-29 or equivalent. After the bonding cement has dried, the rubber sheet shall be applied to the plate. A 3-inch wide strip of separating material such as aluminum foil shall be located between the plate and the rubber sheet along one e
36、dge of the plate to facilitate testing of adhesion between the plate and the rubber sheet. A second rubber sheet shall be coated on one side with accelerated bonding cement, GACO N-29 or equivalent and allowed to dry. A 3-inch wide strip of separating material such as aluminum foil shall be located
37、between the rubber sheets along one edge to facilitate testing for adhesion between the plies. The second rubber sheet shall be pressed firmly onto the prepared plate on top of the first rubber sheet, such that no raised or soft spots occur on the plate. Provided by IHSNot for ResaleNo reproduction
38、or networking permitted without license from IHS-,-,-MIL-PRF-2912G (SH) 5A steel roller may be used to assure good adhesion. The completed sample shall be visually observed for evidence of softening or decomposition of the rubber compound at the interfaces with the primer, accelerated bonding cement
39、 and accelerated putty. 4.3 Preparation of test specimens. The test specimens shall be prepared in accordance with the requirements of the tests as specified herein. 4.4 First article inspection. First article inspection of the samples shall consist of the tests specified in 4.4.1, 4.7 and 4.8. 4.4.
40、1 First article tests. Samples prepared as specified in 4.2 or 4.3, as applicable, shall be tested for following properties: (a) Tensile strength and elongation (see 4.6.2). (b) Adhesion (see 4.6.3), both samples. (c) Oxygen pressure aging (see 4.6.4). (1) Tensile strength and elongation (see 4.6.4.
41、1). (2) Adhesion (see 4.6.4.2). (d) Immersion in acid (see 4.6.5). (1) Weight (see 4.6.5.1). (2) Tensile strength and elongation (see 4.6.5.2). (e) Immersion in oil (see 4.6.6). (1) Volume (see 4.6.6.1). (2) Tensile strength and elongation (see 4.6.6.2). (3) Adhesion (see 4.6.6.3). (f) Plastic flow
42、(see 4.6.7). (g) Hardness (see 4.6.8), double rubber ply sample only. 4.5 Conformance inspection. Conformance inspection shall consist of the examinations and tests pertaining to the material (see 4.5.1) 4.5.1 Conformance inspection of the material. The following examinations and tests shall be perf
43、ormed on test specimens of the material. All tests shall be conducted on the two rubber sheet ply samples. Only the subparagraph (a) adhesion test shall be conducted on the putty and rubber sheet ply sample: (a) Adhesion (see 4.6.3). (b) Hardness (see 4.6.8). 4.5.2 Rejection. If the material fails t
44、o conform to all the requirements for which it is tested, the lot of the material represented by the samples or test specimens shall be rejected. 4.6 Methods of examination and test. No tests shall be made on Type II material until the curing time of 24 hours has elapsed; however, this curing time s
45、hall not exceed 14 days. 4.6.1 Visual examination. A visual examination shall be conducted to detect defects in workmanship to ensure conformance to 3.4. MIL-STD-289 shall be used to determine and evaluate defects. 4.6.2 Tensile strength and ultimate elongation. Tensile strength and ultimate elongat
46、ion shall be determined in accordance with ASTM D 412. Dumb-bell specimens shall be prepared using die C. The material of the specimens shall have a uniform thickness within the range of 0.70 to 0.80 inch and shall have an equivalent cure to the rubber lining material. 4.6.3 Adhesion. The adhesion b
47、etween plies and between the rubber and steel and between rubber and putty shall be measured at room temperature, 70 to 90 degrees Fahrenheit (F), on a 12 by 12 inch panel. The Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2912G (SH) 6linin
48、g of the 12 by 12 inch panel shall be cut through to the steel with a sharp knife to give three strips, each 1 by 12 inches, as shown on Figure 1. The method for determining adhesion to steel and ply adhesion shall be as shown on Figure 1. The panel shall be supported in a horizontal position with t
49、he lining on the underside. A sufficient length of the outer ply of one strip shall be separated from the inner ply to permit attachment of a clamp. A dead-weight load of 15 pounds (clamp plus weight) shall be suspended from the outer ply, and the rate of separation of the ply measured. The test shall be performed on the outer ply of each of the three strips; then it shall be performed on the inner ply of each of the three strips to evaluate th
