DLA MIL-I-3930E-1985 INSULATING AND JACKETING COMPOUNDS ELECTRICAL (FOR CABLES CORDS AND WIRES) GENERAL SPECIFICATION FOR.pdf

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1、MIG.1-393OE MIL-I-393OD 28 August 1975 MILITARY SPECIFICATION This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. mis specification covers the general composition and the physical, chemical, and low temperature properties of certai

2、n polymeric compounds used in the insulating and jacketing of electrical cables, cords, and wires, as determined on specimens remved therefrom, but does not cover compounds for hookup wires nor items where the wall thickness of the insulation or jacket is less than .O06 inch. It does not cover chara

3、cteristics associated with the finished product, except that test specimens are taken from the finished product. This specification is intended to serve as a auxiliary to detailed specifications for finished cables, cords, or wires (see 6.2 and 6.3). 1.2 Classification. Insulating and Jacket Canpoun

4、ds shall be of the following types as specified on the applicable specification sheets (see 6.3). INSULATING CaMPOUNDS Type IP - Wium-low temperature polyvinylchloride (WC) and polyvinylchloride acetate (WCA) . Typ IS - Medium-low temperature, styrene-butadiene rubber (SBR). Type IS-L - Medium-Low t

5、emperature, heat-resistant styrene-butadiene rubber (SBR) . Type IR l/ - Low temperature natural rubber.- Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, US Army Communications-Electr

6、onics command and Fort Mmmuth, ATM: AMSEL-DTO, Fort Monmouth, NJ 07703 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 5970 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimite

7、d. THIS DOCUMENT CONTAINS Methods of Testing Test Method Standard No. 601 - Rubber; Sampling and Testing 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-393OE MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes.

8、 MIGSTD-45662 - Calibration Systems Requirements (See Supplement 1 for list of associated specification sheets) (Copies of specifications, standards, handbooks, drawings, and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contract

9、ing activitiy or as directed by the contracting officer,) 2.2 Other publications, The following documents form a part of this specification to the extent specified herein. which are indicated as IXID adopted shall be the issue listed in the current DODISS and the supplement thereto, if applicable. T

10、he issues of the documents AMERICAN SOCIETY FOR TECTING AND MATEZUALS AS“ D518 - Rubber Deterioration - Surface Cracking, Standard Test Mthod for AS!iN 746 - Brittleness Temperature of Plastics and Elastomers by Impact, Standard Test Method for AS?M Dl053 - Wasuring Rubber Property - Stiffening at l

11、ow Temperature using a Wrsional Wire Apparatus, Standard Method for AST4 Dl149 - Rubber Deterioration - Surface Ozone Cracking in a Chamber (Flat Specimen) , Standard Test Method for ASIM D1765 - Carbon Blacks used in Rubber Products, Standard Classification System for (Applications for copies shoul

12、d be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 2,3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMEN

13、TC 3,l Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. In 4 Provided by IHSNot

14、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIGI-393OE 3.2 First article. Insulating and jacketing materials to be furnished under this specification shall be a product which has passed the first article inspection specified in 4.4. - 3.3 Materials. unless otherwi

15、se specified (see 3.1) the materials listed shall be as specified herein. Prior approval to use substitute material must be obtained from the qualifying activity. constituent material shall not be construed as a guaranty of the acceptance of the finished product. Acceptance or approval of any 3.3.1

16、Ozone-protective wax. Natural rubber, styrene-butadiene rubber (SBR), and chloroprene rubber (CR) compounds (except latices of these materials) shall incorporate an “ozone protective“ wax to protect the insulation and jacket against cracking due to exposure. 3.3.2 Insulating compounds. Natural rubbe

17、r (except latices of this material), and styrene-butadiene rubber (SBR) insulating compounds shall contain not less than 2.5 parts by weight of ozone protective wax per 100 parts by weight of base rubber polymer. 3.3.3 Jacketing compounds. 3.3.3.1 Natural rubber and styrene-butadien rubber (SBR) . N

18、atural rubber and styrene-butadiene rubber (SBR) jacketing compounds shall contain not less than 4 parts by weight of ozone protective wax per 100 parts by weight of base rubber-polymer. 3.3.3.2 Chloroprene rubber (CR). Chloroprene rubber (CR) jacketing corripounds shall contain not less than 3 part

19、s by weight of ozone protective wax per 100 parts by weight of base rubber-polymer. 3.3.3.3 Polyurethane elastomr. Polyurethane elastomer shall contain an ultraviolet inhibiting pigment of furnace or channel black of particle size - - averaging 20 nm or less in diameter, in the munt of .5 to .7-part

20、s by hundred (by weight) of elastomer suitable furnace blacks are identified by the designation N 110 in accordance with ASIM 111765. 3.3.4 Free elemental sulfur. Rubber latex and rubber latex-chloroprene rubber latex compounds shall not contain more than .5 percent free elemental sulfur, natural ru

21、bber compounds not mve than .1 percent free elemental sulfur,and styrene-butadiene rubber cosnpainds and ethylene-propylene-diene rubber compounds not mre than .25 percent free elemental sulfur. and 6.5). (see 4.6.1 3.4. Ozone resistance. After testing in accordance with 4.13, the rubber test specim

22、em shall exhibit no visible cracks when examined under a seven power optical magnifier. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-3730E 57 W 4477906 0009887 T W 4.2.1 Materials inspection. For all cables, cords, or wires submitted to the

23、 Government for acceptance, the contractor shall furnish certification of compliance from the source of manufacture for each batch of compound used in the composition of the insulation and jacket. indicate compliance with 3.3 to 3.3.3.3 inclusive I This certification shall (see 6.3). MIL-I-393OE 3.5

24、 Properties of insulatinq and jacketinq. The insulating and jacketing materials furnished under this specification shall conform to the requirements in the individual specification sheet. Conformance shall be determined by subjecting specimens of the insulating and jacketing material (rmved from cab

25、les and cords) to the physical property requirements in the applicable specification sheet. 3.6 Workmanship. Insulating and jacketing material shall be uniform in quality and shall be free from any burrs, die marks, chatter marks, foreign material and other defects that will affect life, serviceabil

26、ity or appearance. 4. QUALITY ACCURANCE PEI13vISIONs 4.1 Responsibility for inspection. nless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or or

27、der, the supplier my use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that suppli

28、es and services conform to prescribed requirements. The Government reserves the right to 4.1.1 Test equipment and inspection facilities. Test equipment and inspection facilities shall be in accordance with standards established by the contractoi: for calibrating the measuring and test equipment used

29、 in controlling product quality. Calibration of the standards which control the accuracy of inspection equipment shall comply with the requirements of MIkS)-45662. 4.2 Classification of inspections. fie examinations and tests of insulating and jacketing materials are classified as follows: a. Materi

30、als inspection. (see 4.2.1). b. C. Quality conformance inspection. (see 4.5). First article inspection (see 4.4). (1) Inspection of product for delivery. (see 4.5.1). (2) Inspection of preparation for delivery. (see 5) . 4.3 Inspection conditions. nless otherwise specified in the cpecific cable, cor

31、d or wire specification referencing this specification, all tests shall be conducted in a standard atmosphere as specified in section 6 of Federal Test Method Standard No. 228. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-e O O flIL-I-3930E 57 7

32、77770b 0009888 L MIGI-3930E 4.4 First article inspection. First article inspection shall be performed by the supplier, after award of contract and prior to production, at a location acceptable to the Government. sample units which have been produced with equipment and procedures normally used in pro

33、duction. under which it is granted, unless extended by the Government to another contract (see 3.1 and 6.7). First article inspection shall be performed on First article inspection is valid only on the contract 4.4.1 Sample size. Provide six inch lengths of Cable, Cord or Wire sample units required

34、to perform the tests (see 4.4.2) for first article inspection which shall be submitted in accordance with MIGSTD-105, unless otherwise specified (see 6.3). 4.4.2 Test routine. Sample units shall be subjected to the inspections specified in 3.3.4, 3.4 and 3.5. 4.4.3 Submission of data for approval. T

35、est results shall be forwarded to the contracting officer for approval (see 6.3). 4.4.4 Failures. me or more failures shall be cause for refusal to grant first article approval. 4.5 Quality conformance inspection. Quality conformance inspection shall be in accordance with Table I. TABLE I. QUALITY a

36、xul?o- INSPECTION. INSPECTION Group A Free elemental sulfur Tensile strength Elongat ion Set Tensile stress Tear resistance Oxygen-bomb aging Air-pressure aging Air-oven aging Oil immersion Durome ter hardness Cold-tension recovery Shrink-back Group B Brittleness Ibrsional-stiffness ratio an torsion

37、al modulus Group C Ozone reistance Hydrolytic stability 7 REQUIFwmTr PARAGRAPH 3.3.4 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.5 3.4 3.5 TEST -OD PARAGRAPH 4.6.1 4.6.2.2 4.6.2.3 4.6.2.4 4.6.2.5 4.6.2.6 4.6.2.7 4.6.2.8 4.6.2.9 4.6.2.10 4 . 6.2.11 4.10 4.14 4.7 4.9 4.13 4.15 Provided by IH

38、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- _- _ - MIL-I-3930E 59 9999706 0009889 3 MI PI- 3 930E 4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of Groups A, BI and C inspection. Delivery of products which have pass

39、ed the groups A and B inspection shall not be delayed pending the results of the Group C inspection. 4.5.1.1 Inspection lot. An inspection lot shall be as defined in the end item specification. When not defined therein, it shall consist of all the sample units (lengths, reels, spools, coils) of cabl

40、es, cords, or wires of a specific type and AWG size, the compounds for which were made under substantially the sdme conditions, from the same batch, and offered for inspection at one time. 4.5.1.2 Unit of product. When not defined in the end item specification, the unit of product shall be taken as

41、1,000 feet of cables, cords or wires, whether that length be part of the spool, reel, or mil or consist of one or more spools, reels, or coils. 4.5.1.3 gample. Tne sample shall consist of the nWr of units of product required by the sampling plan for the size of the lot submitted. 4.5.1.4 Selection o

42、f sample units. The number of sample units required Samples shall be selected at random intervals throughout the for inspection shall be chosen by selecting one spool, reel, or coil for each sample unit, lot. sample unit for purposes of inspection. After which the selected spool, reel, or coil shall

43、 be treated as the 4.5.1.4.1 _u_- Molded sheets. furnished for certain tests of small size cables when authorized in 4.6.2.6., The stock of these sheets shall be taken from the same batch as the insulation or jacket that they represent (preferably uncured rubber for these sheets will be taken from t

44、he feed to the extruder and record kept of the cable produced from that run). The sheets shall be at the sam state of cure as the insulation or jacket that they represent. The state of cure shall be considered to be the same if the tensile stress of the sheet at 200 percent elongation is within 20 p

45、ercent of that of the insulation or jacket it represents. The sheets shall be marked to show the direction of calendar or mill grain. mid+ sheets of .O75 to .O85 inch thick may be 4.5.2 Sampling plan. The sampling plan shall be in accordance with MIL-STD-155. used at the start of the contract. From

46、each sample unit (each length, reel, spool, or coil), a sample length of cable, cord, or wire shall be cut. Specimens as specified in 4.6.2.1, 4.6.2.5 and 4.6.2.6 and 4.6.3.3 shall be cut from each sample length. The reduced inspection procedure shall be R-l. The acceptable quality levels (AQL) shal

47、l be 6.5 (percent defective) and the inspection level shall be S-4 for normal insp however, final acceptance and shipment shall be withheld until the group C inspection has the applicability of this provision for reduced number of conductors to be tested shall be as determined by the contracting off

48、icer. from the shielded conductor prior to subjection to test conditions and tests. The shield shall be removed 4.6.2.1.1 Size of spcimen for test of tensile properties. conductor smaller th= AWG size-6, the insulatFon test smcimen may be an In the case of entire section of the insulation,-6.000 inc

49、h long. is used, the specimen shall not be cut longitudinally unless necessary to remove the conductor. specimens, approximately square in section with cross section not greater than .O25 square inch, shall be cut from the insulation. necessary to use segmented or sector-shaped specimens. The preferred specimen of the jacket is a 6.000 inch length wi.th a die-cut reduced section 2.313 inches long by .250 inches wide. conditioning. Whecthe full cross section In the case