1、1.1 electrical electrical MIL-R-1070 73 799790b Oi22b75 O MIL-R-81090( Wep) 1 June 1964 MI L ITARY SPEC I FI CATI ON RUBBER, ELECTRICALLY CONDUCTIVE, FUEL RESISTANT This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1. SCOPE Scope - This specification covers
2、 the requirements for y conductive fuel resistant rubberintended for dissipation of charges (see 6.1). 1.2 Classification - The electrically conductive fuel resistant rubber shall be of the following types as specified (see 6.2). Type I - Solid Rod or Tube Type II - Sheet or Film -. 2. APPLICABLE DO
3、CUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPEC I FICATIONS Federal NN-P- 5 15 Plywood, Container Grade UU- P- 268 Paper; Kraft, Untreated, Wrapping UU-T-111 Tape,
4、 Paper, Gummed, Sealing and Securing PPP- B-636 Box, Fi berboard PPP-B-640 Boxes, Fiberboard, Corrugated, Tri pl e Wal 1 Mi 1 i tary MI L- S - 3 1 36 Standard Test Fluids, Hydrocarbons FSC 9320 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-3-81
5、 090( Wep) STANDARDS Federal Federal Test Rubber: Sampling and Testing Met hzd Standard No. 601 Military MIL-STO-I O5 MIL-STD-129 Sampling Procedures and Tables for Marking for Shipment and Storage .Inspection by Attributes 2 (When requesting any of the applicable documents, refer to All requests sh
6、ould be made via the cognizant both title and number, Government qualiw control representative. and other unclassified specifications and drawings required by contractors in connection with specific procurement functions should be obtained upon application to the Commanding Officer, Naval Supply Dep
7、ot (Code DCI) , 5801 Tabor Avenue, Philadelphia 20, Pennsylvania, should be obtained from the procuring activity or as directed by the contracting officer. ) Copies of this specification All other documents a 2.2 Other Publications - The following documents form a part of this mecification to the ex
8、tent specified herein, Unless otherwise indicated; the issue in effect on date of invitation for bids or request for proposal shall apply. Consolidated Classification Committee Uniform Freight Classification Rules (Application for copies should be addressed to the Consolidated Classification Committ
9、ee, 202 Chicago Union Station, Chicago 6, Illinois) American Trucking Association National Motor Freight Classification Rules and Container Regulations (Application for copies should be addressed to the National Classif- ication Board, 1424 Sixteenth Street, N.W., Washington 6, D.C.) Provided by IHS
10、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-1070 73 7777706 0422b77 4 U MIL-R-81090 ( Wep) American Society for Testing and Materials ASTM D257-61 Electrical Resistance of Insulating Materials (Application for copies should be addressed to the American So
11、ciety for Testing and Materials, 191 6 Hace Street, Philadelphia, Pennsylvania 19103.) 3. R3QTJIREMENTS 3.1 - Material - The synthetic rubber furnished under this specification shall be a vulcanized elastomeric compound which is electri- cally conductive and fuel resistant (see 6.3 and 6.4). 3.1.1 -
12、 Age - Material shall not be offered for delivery more thm nine (9) months after its cure date. 3.2 Form Unless otherwise specified, the rubber shall be furnished in extruded, solid, flexible rod or tube form 0.250 2 0.025 inch in diameter, or sheet or film form 0.020 5 0.005 inch in thickness. leng
13、th of tine rod or tube form and the dimensions of the sheet or film form shall be as specified on the drawing or in the contract or order (see 6.2). The 3.3 Workmanship - The rubber compound shall be manufactured by such processes as to meet all the requirments of this specification (see 6.3 and 6.4
14、). Table I PHYSICAL PROPERTIES PXOPERTY As Received, Standard Conditioas Surface resistivity (ohms) Snore A hardness (points) Tensile strength (psi) Ultimate elongation ( % 1 Compression Set (I) 72 5 I Rour at 212Of2OF REQUIREMENT 1200 80 f 2200 150 40 FED-STD-601 METHOD NO. OR SPECIFICATION PARAGRA
15、PH KO. 4.5.2 3021 4111 41 21 33.1 1 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ MIL-R-81070 73 W 9799906 0422678 6 W MIL-R-81090( Wep) Table I (Cond) I 4 PROPERTY Oven Aged at 212O220F for 7021 Hours, Change In Shore A hardness (points) Tens
16、ile strength (PSI) Ultimate elongation ( % Weight ($1 Distilled Water Immersion at 212O+2OF for 7021 Hours Change In Shore A hardness (points Volume (%) ASTM No. I Oil Immersion at 212O+2OF for 7O+l Hours, Change In Shore A hardness (points) Voume (%) Fu el Immers ion, Ch ange in Volume (8 of origin
17、al) Phase A, 7 days at standard conditions Phase B, 7 days at standard conditions Phase C, Dried 4 hours at 1580+20 Cold Bend (-67Of2“F) REQUIREMENT +I 0-5 -20 (max) -55 (mad -10 (ma) +5 - 15 +I5 -0 1.20 -5 +IO -20 -5 (a= Shall not crack FED-STD-601 METHOD NO. OR SPECIFICATION PARAGRAPH NO. 7221 302
18、1 4111 41 21 4.5.3 3021 621 I 3021 621 i 4.5.4 4.5.4 4.5.4 4.5.5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 c MIL-R-L070 93 9777906 OLi22677 W 5 MIL-R-81 090(Wep) 4, QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection - Unless other
19、wise spec- ified in the contract or purchase order, the supplier is responsible for performance of all inspection requirements as specified herein. as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government reserves the right to perf
20、orm any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. for acceptance of individual lots shall consist of tests for all require- ments specified in Section 3. Except The Government 4.2
21、Classification of inspection - Quality conformance tests 4.3 4.3. I Sampling for quality conformance inspection - Size of lot - For the purposes of inspection a lot shall consist of all material of the same type produced from the same batch of rubber compound, and offered for delivery at one time. 4
22、.3.2 selected in accordance with Standard MIL-STD-105 at inspection level II from each lot for the visual and dimensional examination specified in 4.4.1. Sampling for lot acceptance - Sample pieces shall be 4.3.3 Sampling for quality conformance testing - The manu- facturer shall furnish the necessa
23、ry samples molded from the same material and under the same conditions as that used in the finished product. each type of material specified, the samples shall be six in number of 6 by 6 by 0.075 2 0.005 inch platen sheets and three compression set discs O. 500 2 O. O1 O inch thick and I. 129 2 O. O
24、01 inch in diameter. For 4.4 Quality conformance inspection - 4.4.1 Visual and dimensional examiiiation - Each sample selected in accordance with 4.3.2 shall be visually and dimensionally examined to verify conformance with the requirements of 3.1, 3.2, 3.4 and all other requirements which do not in
25、volve tests. defects shall be rejected. If the number of defective samples exceeds the acceptable number for the appropriate sampling plan of Standard EL-STD-I05 at acceptance quality level (AQL) 2.5 percent, the lot represented by the samples shall. be rejected. Any piece having one or more 5 Provi
26、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_sl _ MIL-R-81090 93 M 999990b 0422680 4 MIL- R-81090( Wep) 4,4,2 Quality Conformance tests - The samples furnished in accordance with 4.3.3 shall be sub.iected to the tests specified in Table I. Results of
27、specimens for each test-chal 1 be averaged to determine conformance with this specification. fail one or more of the tests, the entire lot shall be rejected. If the average of the specimens from each sample 4.5 Test methods - 4.5.1 Standard conditions - Unless otherwise specified, tests shall be con
28、ducted at a temperature of 24O 2 30C (750 - + 50F). be conditioned for at least 4 hours before testing. Samples shall 4.5.2 Surface resistivity - Three disc specimens, four inches in diameter, shall be prepared from three of the 6 by 6 by 0.075 + 0.005 inch platen sheets. Tests shall be conducted in
29、 accordance with ASTM Method D257-61, using a low resistant ohmmeter, or equivalent, with 10 percent accuracy. Lead discs, 2 inches in diameter, shall be centrally located on one face of the specimen. The guard disc shall be a concentric ring of 2.28125 inches inside diameter, with an outside diamet
30、er equal to that of the specimen. The unguarded disc shall be 4 inches in dianieter, applied to the opposite side of the specimen. The guarded electrode is a brass cylinder 2 inches in diameter and 1 inch in thickness. The guard electrode is a brass ring of 2.28125 inches inside diameter, an outside
31、 diameter equal to that of the specimen, and 0.125 inch thick. inches in diameter and 0.375 inch thick, The surface resistance measurement shall be made between the guarded electrode and the guard electrode. Calculations necessary for surface resistivity shall be made using the approximate ASTN form
32、ulas for effective area and effective perimeter, three specimens oven aged at 2120 2 2OF for 70 + 1 hours. be approximately 1 by 2 by 0.075 inch in thickness, The specimens shall be held over night in a desiccator and weighed to the nearest milligram before subjecting them to oven aging. After remov
33、al from the oven, specimens shall be cooled in a dessicator for not less than 2 hours nor more than 70 hours and again weighed to the nearest milligram. calculated as follows: The unguarded electrode is a brass disc 4 4.53 Change in weight - Change in weight shall be conducted on The specimens shall
34、 The change in weight shall be Percent change in weight = W7 - Wi x 100 W1 Where: W1 = Initial weight W2 = Weight after oven aging 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-0 MIL-R-81 090 ( Wep ) 4.5.4 Fuel immersion - Three specimens shall b
35、e successively immersed in aromatic fuel conforming to type III, of Specification MIL-S-I, and in alkylate fuel conforming to type I, of Specification MIL-S-3136, under the conditions specified below. after the following phases, as a percent change of the original volume: Volume change data shall be
36、 recorded Phase A - Immersion in type III fluid of Specification MIL-S-3136, - Immersion in type I fluid of Specification MIL-S-3136, for 7 days at room temperature. for 7 days at room temperature Phase B Phase C - Air dried at room temperature for at least 16 hours, and followed by drying for 4 hou
37、rs in a circulating air oven at a temperature of 70“ 1: IoC (158O 1: SOF). Phases A, B and C shall be conducted successively on the same specimens. The period between phases A and B, during which the specimens are not immersed, shall not exceed 30 minutes. moved from the immersion medium, dipped rap
38、idly in acetone or alcohol, blotted lightly, and tested within 3 minutes, The test specimens shall be re- 4.5.5 Cold bend - 4.5,5. I Specimens - The test specimens shall be three strips 5* by by 0.075 f 0.010 inches. 4.5.5.2 Apparatus - The bending device shall consist of two parallel jaws of suitab
39、le length, 2 or in fiberboard containers conforming to Specifcation PPP-B-640 for gross weights up to 200 pounds. As far as practical, containers shall be of minimum cube and tare and shall contain identical quantities, accordance with the appendix of the applicable container specification. Containe
40、rs shall be closed and strapped in 5.2.2 Level B - Shipping containers shall enclose the contents in a snug, tight-fitting manner. 5.2.2. i Rubber rod or tube, packaged as specified in 5.1.1.1, shall be packed in fiberboard containers conforming to Specification PPP-B-636, class I. If more than one
41、roll is packed .in the fiberboard container, the rolls shall be separated by fiberboard sheets, both vertically and hori- zontally, conforming to Specification PPP-B-636, class I. Gross weight shall not exceed 70 pounds. 5.2.2.2 Rubber sheet or film, packaged as specified in 5.1.1.2, shall be packed
42、 in fiberboard containers conforming to Specification PPP-B-636, class I, for gross weights up to 70 pounds; or in fiberboard containers con- forming to Specification PPP-B-640 for gross weights up to 200 pounds. far as practical, containers shall be of minimum cube and tare and shall con- tain iden
43、tical quantities. cordance with the appendix of the applicable container specification. As Containers shall be closed and strapped h ac- 5.2.3 Level C - Packages which requre overpack- for accept- ance by common carrier shall be packed in exterior type shipping containers in a manner which will insu
44、re safe delivery and acceptance at point of delivery. Containers shall comply with the Consolidated Freight Classifica- tion Rules or other regulations as applicable to the mode of transportation. . 5.3 Marking - Unit packages and exterior shipping containers shall be marked in accordance with Stand
45、ard MILSTD-I 29, shall be the exact nomenclature for the part or item that has been approved under the contract or order. The nomenclature 5*3*1 In addition to any special marking required by the con- tract or order, the following information shall be added: Date of Cure (calendar quarter) (year) ST
46、ORE IN COOL, DRY PLACE. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_m - MIL-R-1070 73 W 777770b 0422b84 1 W 7 x MIL-R-81090( Wep) 6, YOTES 6.1 Intended use - Electrically conductive, fuel resistant rubber compounds reduce the hazard from expl
47、osion and fire associated with the refueling of Military aircraft in areas containing an electromagmetic field of high intensity, be used for specialized applications in aircraft, space vehicles and ship- board end-items. Molded, extruded and laminated materials may also 6.2 Ordering data - Procurem
48、ent documents should specify the (a) Title, number, and date of this specification (b) Type of material required (see I, 2) (c) Fora of material required (see 3.2) (d) Dimensions required (see 3.2) following: (e) Selection of applicable level of preservation, pack- (f) Special packing, marking, if r
49、equired (see 5 3. I ) aging, and packing (see 5. I and 5.2) 6.3 Recommended formulation for electrically conductive, fuel resistant rubber compound - Compound Yo. 1772, Aeronautical Materials Laboratory, Naval Air Engineering Center, Philadelphia, Pennsylvania 19112. Ma terials Paracril B. . 100.0 Sulfur (Blackbird). . 1. O Zinc Oxide. . 5.0 Stearic Acid. 1.0 Vulcan XC-72 (pellets). . 100. O Plasticizer SC. . 5.0 Goodrite GP-23
