1、MIL-R-22252B 53 m 7997706 0203200 7 m MIL-R-21252B(SH) .8 September 1987 SUPERSEDING MIL-R-21252A(SHIPS) 8 February 1965 (See 6.3) MILITARY SPECIFICATION RUBBER SHEET, SOLID, SYNTHETIC, SHIPBOARD WATER EVAPORATOR GASKETING This specification is approved for use within the Naval Sea Systems Command,
2、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 covers gasket material for use in shipboard water stills. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The fo
3、llowing specifications and stan- dards form a part of this specification 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, ci
4、ted in the solicitation. SPECIFICATIONS FEDERAL PPP-B-576 - Boxes, Wood, Cleated, Veneer, Paper Overlaid. PPP-B-585 - Boxes, Wood, Wirebound. PPP-B-591 - Boxes, Shipping, Fiberboard, Wood-Cleated. PPP-B-601 - Boxes, Wood, Cleated-Plywood. PPP-B-621 - Boxes, Wood, Nailed and Lock-Corner. PPP-B-636 -
5、Boxes, Shipping, Fiberboard. PPP-T-76 - Tape, Packaging, Paper (For Carton Sealing). 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
6、 the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 5330 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited Provided by IHSNot for Resa
7、leNo reproduction or networking permitted without license from IHS-,-,-MILITARY MIL-P-116 - Preservation, Methods of. MIL-L-10547 - Liners, Case, and Sheet, Overwrap; Water-Vaporproof or Waterproof, Flexible. MIL-1-17433 - Inhibitor, Hydrochloric Acid Descaling and Pickling Solutions. STANDARDS FEDE
8、RAL FED-STD-601 - Rubber: Sampling and Testing. MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-289 - Visual Inspection Guide for Rubber Sheet Material. (Copies of specifications and standards required by contractors in connec- tion with specific acquisition functions should be obta
9、ined from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following document forms a part of this speci- fication to the extent specified herein. Unless otherwise specified, the issues of the documents which aie DoD adopted shall be those listed in t
10、he issue of the DoDISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovernment docu- ments which is current on the date of the solicitation. UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classificati
11、on Ratings, Rules and Regulations (Application for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) (Nongovernment standards and other publications are normally available rom the organizati
12、ons which prepare or which distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this sPecification and the references cited herein (except for associated detai
13、l specifications, specification sheets or MS standards), the text of this specifi- cation shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3 0 REQUIREMENTS 3.1 II Form. The synthetic rubber s
14、hall be furnished in the form of sheets with dimensions and tolerances as specified (see 6.1). 3.2 Physical requirements. The synthetic rubber material shall conform to the requirements specified in table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
15、S-,-,-MIL-R-212528 53 7777706 0103102 2 m TABLE I. Physical requirements of rubber. Properties Initial properties: Tensile strength, lb/in2, minimum Ultimate elongation, percent, minimum Hardness, shore A durometer, 3 second Tensile strength, lb/in2, minimum Ultimate elongation, percent, minimum Har
16、dness, shore A durometer, maximum Compression set, percent, maximum Tensile strength, lb/in2, minimum Ultimate elongation, percent, minimum Volume change, percent Extraction, percent, maximum (a) After immersion in hydrochloric acid solution. (b) After immersion in sodium bisulfate solution. (c) Aft
17、er immersion in sulfamic acid solution. Tensile strength, lb/in2, minimum Ultimate elongation, percent, minimum Volume change, percent Ini t ia1 After oven aging Crushing resistance Properties after oven aging: Properties after immersion in distilled water: Properties after immersion in descaling so
18、lution: Sealing ability: 3.3 Material. Requirement 1600 70 85 + 5 1600 40 95 65 1200 60 O to 25 O. 5 - 1200 60 O to 25 no leaks no leaks no damage Test method 4.7.1 4.7.1 4.7.2 4.7.3 4.7.3.1 4.7.3.1 4.7.3.2 4,7.3.3 4.7.4 4.7.4.1 4.7.4.1 4.7.4.2 4.7.5 4.7.4.3 4.7.5.1 4.7.5.1 4.7.5.2 4.7.6 4.7.6 4.7.6
19、 4.7.6 3.3.1 Recovered materials. Unless otherwise specified 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. T
20、he term “recovered materials“ means materials which have 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
21、 specification unless otherwise specifically specified. 3.4 Workmanship. The workmanship shall be such as to meet all applicable requirements of this specification. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4. QUALITY ASSURANCE PROVISIONS 4.1 R
22、esponsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any oth
23、er facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and serv
24、ices conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must 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 re
25、quirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality conformance does not authorize submission of known defective m
26、aterial, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 SamplinG 4.2.1 - Lot. For purposes of sampling, examinations and tests, a lot shall consist of not more than 2500 pounds of material of the same form and dimensions, produced in one plant
27、under essentially the same conditions and offered for delivery at one time. 4.2.2 Sampling for examination. A random sample of rolls shall be selected from each lot in accordance with table II for the examination specified in 4.3. A-unit area is defined as an area of 1-square foot. TABLE II. Samplin
28、g for examination. Number o nonconforming defective unit areas of material Lot size, Reject Accept Reject Accept unit areas unit areas number of number of Total defects Major defects Sample size, Up to 8 5 O 1 22 21 11 10 200 3201 and over 15 14 8 7 125 1201 to 3200 11 10 6 5 80 501 to 1200 8 7 4 3
29、50 281 to 500 6 5 3 2 32 151 to 280 4 3 2 1 20 91 to 150 3 2 2 1 13 51 to 90 3 2 1 O 13 26 to 50 2 1 1 O 8 9 to 25 1 O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-R-21252B 53 m 9777706 0103104 b m A major defect is a defect that is likely t
30、o result in failure, or to reduce materially the usability of the unit of product for its intended purpose. A minor defect is a defect that is not likely to reduce materially the usability of the unit of product for its intended purpose, or is a departure from estab- lished standards having little b
31、earing on the effective use or operation of the unit. Total defects is major and minor defects combined. 4.2.3 Sampling for tests. Samples shall be taken at random from those selected in 4.2.2 in sufficient quantity to conduct either the production check tests or the quality conformance tests specif
32、ied in 4.4 and 4.5, as applicable. 4.3 Quality conformance examination. Each of the samples selected in accordance with 4.2.2 shall be subjected to surface examination for workmanship, dimensions and tolerances. MIL-STD-289 shall be used to determine and evaluate visual defects. If the number of def
33、ects exceeds the acceptance number, this shall be cause for rejection of the entire lot represented by the sample. 4.4 Production check tests. Production check tests shall be conducted on samples from the first lot of material offered under a contract or order and from every tenth lot thereafter. Ea
34、ch of the tests specified in 4.7 shall be conducted. 4.5 Quality conformance tests. Quality conformance tests shall be con- ducted on those lots which are not represented by 4.4. The tests specified in 4.7.1, 4.7.2, and 4.7.3 shall be conducted. 4.6 Action in case of nonconformance. If any of the sa
35、mples tested in accordance with 4.4 or 4.5 is found not to be in conformance with the require- ments of this specification, the lot which it represents shall be subject to rejection. Furthermore, if the failure was a production check test, additional samples shall be taken from (or provided to repre
36、sent) each subsequent lot and shall be subjected to the test or tests wherein the failure occurred. Each lot shall then be considered acceptable only after satisfactory results are obtained on the test or tests by all the samples taken to represent the lot. This addi- tional testing shall be discont
37、inued after four successive lots have passed the test or tests. 4.7 Test procedures. 4.7.1 Tensile strength and ultimate elongation, The tensile strength and ultimate elongation shall be determined by methods 4111 and 4121, respectively, of FED-STD-GOi. Die III specimens shall be used for determinat
38、ions of these properties. 4.7.2 Hardness. The hardness shall be determined by method 3021 of FED-STD-601. Plied up specimens may be used and the reading shall be taken 3 seconds after firm contact is made-between the rubber and the presser foot of a shore A durometer. 4.7.3 Oven aging. Method 7221 o
39、f FED-STD-601 shall be used for oven aging. The aging period shall be 70 + 1/4 hours at 100 + 1.1 degrees Celsius (“C) (212 + 2 degrees Fahrenheit (OF). - - 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.7.3.1 Tensile strength and ultimate elong
40、ation. Tensile strength and ultimate elongation after oven aging shall be determined by the procedure spec- ified in 4.7.1. 4.7.3.2 Hardness after oven aging. Hardness after oven aging shall be determined by the procedure specified in 4.7.2. 4.7.3.3 Hot compression set. Hot compression set shall be
41、determined by method 3311.of FED-STD-601. The specimens shall be compressed to 25 percent deflection and subjected to the conditions specified in 4.7.3. Plied up specimens may be used. 4.7.4 Immersion in distilled water. Specimens for tensile strength and ultimate elongation and volume change shall
42、be conditioned for 70 + 1/4 hours at 90 + l.lC (194 $. 2F) in distilled water. Specimens for the ef;traction test shall i;e conditioned for 1 hour at 100 + l.lC (212 - + 2F) in distilled water. 4.7.4.1 Tensile strength and ultimate elongation after water immersion. Tensile strength and ultimate elon
43、gation after water immersion shall be deter- mined in accordance with method 6111 of FED-STD-601. The tensile strength shall be based on the swollen cross-sectional area. 4.7.4.2 Volume change after water immersion. The change in volume after water immersion shall be determined in accordance with me
44、thod 6211 of FED-STD-601. 4.7.4.3 Extraction. The extraction in boiling water shall be determined in accordance with method 6621 of FED-STD-601. 4.7.5 Immersion in descaling solutions. Test specimens shall be immersed in each of the following descaling solutions for 70 + 1/4 hours at 90 + l.lC (194
45、+ 2F): - - (a) A 10 percent solution by weight of hydrochloric acid in water containing an inhibitor. The inhibitor shall conform to MIL-1-17433. (b) A solution of 1 pound of sodium bisulfate in 1 gallon of water. (c) Sulfamic acid solution. One pound of sulfamic acid containing 1 percent by weight
46、of diethylthiourea inhibitor added to 1 gallon of water. 4.7.5.1 Tensile strength and ultimate elongation after immersion in descaling solutions. The tensile strength and ultimate elongation shall be determined after immersion in each of the descaling solutions specified in 4.7.5, The procedure shal
47、l be in accordance with method 6111 of FED-STD-601. 4.7.5.2 Volume change after immersion in descaling solutions. The change in volume shall be determined after immersion in each of the descaling solutions specified in 4.7.5. The procedure shall be in accordance with method 6211 of FED-STD-601. Prov
48、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-O b * a 4.7.6 Sealing ability test. The details and constructions of the special test equipment required for the sealability test of the synthetic rubber sheet material shall be as shown on figures- 1, 2, a
49、nd 3. Gaskets of the sheet rubber shall be cut to fit the flanges and the bolt holes of the test apparatus. The apparatus shall then be assembled by applying 100 foot-pounds of torque to each of the bolts. Nitrogen pressure of 500 pounds per square inch (lb/in2) gauge shall then be applied while the apparatus is immersed and any leakage noted. The gas pressure shall be released and the device placed in a circulating air oven for 2 weeks at 100 + l.lC (2
