1、AMSC N/A FSC 5330 MIL-DTL-3533C 2 February 2009 SUPERSEDING MIL-R-3533B 25 April 1964 DETAIL SPECIFICATION RUBBER, SYNTHETIC; SHEET, STRIP AND MOLDED This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the
2、 requirements for sheet, strip and molded synthetic rubber for use as torpedo gasket material. 1.2 Classification. Synthetic rubber is of the following types and grades as specified (see 6.2). Type I - O-Rings Type II - Molded parts (other than O-Rings), sheet and strip Grade A - Medium hard Grade B
3、 - Medium soft 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other sections of this standard or recommend for additional information or as examples. While every effort
4、has 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 standard, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The
5、 following specifications and standards 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. FEDERAL STANDARDS FED-STD-601 Rubber, Sampling and Testing INCH-POUNDComments, suggestions,
6、or questions on this document should be addressed to Defense Supply Center Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA 19111-5096 or e-mail to dscpg one with the mold seam and the second at right angles to the mold seam. A minimum of two samples shall be tested. In con
7、ducting the test, the O-Ring shall first be severed to open the ring. A cut shall then be made through the center of the cross sectional diameter of one end. Lengthwise, this cut shall be about 1.25 inches (31.75 mm), sufficient to allow the two halves formed to be inserted into the jaws of a testin
8、g machine (Scott tester, or equivalent). The tear resistance shall be calculated as follows : Tear resistance, pounds per inch of thickness = F T where: F = minimum tearing force in lbs. and T = the thickness of the specimen in inches. 4.4.4 Crush test (Type I only). Three O-Rings shall be selected
9、at random for testing. They shall be twisted (inside out) one-half turn about the central axis of the cross section and then placed in separate locations between two rigid steel plates having a surface roughness of 32 to 63 inches (812.8 to 1600.2 mm) rms. (in accordance with standard ASME B46.1). A
10、n axial compression load of 16,800 pounds (7620.35 Kg) (or 5600 (2540.12 Kg) pounds for each ring in the layer) shall be applied. The plates shall be secured to maintain this load for 20 hours by a suitable means (mechanical fixture). The rings shall then be removed and inspected immediately for cra
11、cking or disintegration. Following this inspection, the rings shall be stored at room temperature in the free condition and the percent recovery of the ring cross section determined at the end of six hours. No cracking or disintegration shall be evident and the cross sectional dimensions of the O-Ri
12、ngs shall have attained the values specified in Table II in respect to the “as manufactured” size at the thinnest section. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3533C 84.4.5 Permanent set (Type I only). Permanent set on three O-Ring
13、s shall be made by measuring the ID and then stretching over a tapered cone (lubricated with ASTM No. 1 oil) until the ID of the seal has been stretched 150% (if the ID measures .984 inch (25 mm), the ring shall be stretched to 2.460 inches (62.484 mm) ID). The ring shall be held in this stretched s
14、tate for ten minutes, removed from the cone, and the ID determined after ten minutes rest. Permanent set shall be calculated from the as-measured ID before and after the test. Any breaking or cracking of the test samples shall be cause for rejection. 4.4.6 Temperature retraction (Type I only). This
15、test shall be in accordance with ASTM D1329 except that O-Ring samples (Size No. 214 of SAE AS568) shall be used and three samples tested. After installation, samples shall be elongated 50% as determined by the rod markings and the rate of warming shall be 1F (.6C) per minute. The temperature retrac
16、tion 50/10 reading of these seals shall be determined and recorded. 4.4.7 Low temperature flexibility (Type II only). This test shall be in accordance with ASTM D746 except that the thickness of the samples shall be .075 .005 inch (1.905 .127 mm). The test temperature for exposure of the samples sha
17、ll be 1.4 4F (-17 2C). 4.4.8 Adhesion and corrosion. Specimens shall be tested in accordance with Method 14211 of Federal Test Method Standard No. 601. For Type I material, the actual O-Ring shall be used for the test specimen in place of the one inch square specimen. 4.4.9 Air aging. Air aging shal
18、l be conducted in accordance with ASTM D573. 4.4.10 Aging in liquids. Specimens shall be aged in accordance with Method 6001 of Federal Test Method Standard No. 601 using Medium No. 1 for the oil and synthetic sea water for the water medium. Tests shall be conducted for a period of 168 1 hour at a t
19、emperature of 158 4F (70 2C). 4.4.10.1 Synthetic sea water. The synthetic sea water used in the aging tests shall be formulated as follows: Sodium Chloride 23 gr Sodium Sulfate 8 gr Decahydrate Stock Solution 20 ml Distilled Water To make 1 liter 4.4.10.1.1 Stock solution. The stock solution used in
20、 formulating the synthetic sea water shall have the following composition: Potassium Chloride 10 gr Potassium Bromide 45 gr Magnesium Chloride 550 gr Sexahydrate Calcium Chloride 110 gr Sexahydrate Distilled Water To make 1 liter 4.4.10.2 Tensile strength and ultimate elongation. Tensile strength an
21、d ultimate elongation property determinations after liquid aging shall be performed in accordance with Method 6121 of Federal Test Method Standard No. 601 except that a recovery period of twenty hours in the original test liquids will be allowed. Provided by IHSNot for ResaleNo reproduction or netwo
22、rking permitted without license from IHS-,-,-MIL-DTL-3533C 94.4.10.3 Volume change. Changes in volume after liquid aging shall be performed in accordance with Method 6211 of Federal Test Method Standard 601. O-Ring samples shall be used for Type I material and compression molded discs .250 .005 inch
23、 (6.35 .127 mm) thick and not less than one inch in diameter shall be used for Type II material. The discs used for hardness tests may also be used for volume change determinations. Tests shall be run in triplicate. 5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements sha
24、ll be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained by the Inventory
25、 Control Points packaging activities within the Military Service or Defense Agency, or within the military services system commands. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM products, or by contacting the respon
26、sible packaging activity. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. Synthetic rubber covered by this specification is intended for all types of synthetic rubber gaskets and seals for torpedo use. 6.2 A
27、cquisition requirements. Acquisition documents should specify the following: a. Title, number, and date of this specification. b. Type and grade of material required (see 1.2) c. Form of material required *see 3.2) d. Dimensions required (see 3.2.1 and 3.2.2). e. Shape required (see 3.2.2). f. Toler
28、ance for cut or molded material (see 3.2.2). g. Marking required (see 3.7). h. Packaging requirements (see 5.1). 6.3 Shelf-life. This specification covers items where the assignment of a Federal shelf-life code is a consideration. Specific shelf-life requirements should be specified in the contract
29、or purchase order, and should include, as a minimum, shelf-life code, shelf-life package markings in accordance with MIL-STD-129 or FED-STD-123, preparation of a material quality storage standard for type II (extendible) shelf-life items, and a minimum of 85 percent shelf-life remaining at time of r
30、eceipt by the Government. These and other requirements, if necessary, are in DoD 4140.27-M, Shelf-life Management Manual. The shelf-life codes are in the Federal Logistics Information System Total Item Record. Additive information for Shelf-life management may be obtained from DoD 4140.27-M, or the
31、designated shelf-life Points of Contact (POC). The POC should be contacted in the following order: (1) the Inventory Control Points that manage the item and (2) the DoD Services and Agency administrators for the DoD Shelf-Life Program. Appropriate POCs for the DoD Shelf-Life program can be contacted
32、 through the DoD Shelf-Life Management website: https:/www.shelflife.hq.dla.mil/. 6.4 Subject term (key word) listing. O-Ring Torpedo Vulcanized elastomeric compound Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3533C 106.5 Changes from pre
33、vious issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing activity: Army - MR DLA IS Navy - OS Air Force -99 (Project 5330-2009-004) Review activities: Army - AR, MI Navy - AS Air Force
34、 - 71 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
