1、 /- MIL-I- 24178 (SHIPS) 25 March 1966 MILITARY SPECIFICATION INSULATION TAPE, ELECTRICAL, SEMI-CURED THERMOSETTING RESIN TREATED GLASS, ARMATURE BANDING, NAVAL SHIPBOARD 1. SCOPE 1.1 This specification covers semi-cured thermosetting resin treated, unidirectional glass electrical insulating tape in
2、tended for banding armatures of rotating electrical machines for shipboard use. Other applications may be banding of wound rotor coils, securing stator coils, surge rings, commutator string bands. 1.2 Classification. - Glass banding tape shall be of the following types, as specified (see 6.2): Type
3、B - General purpose, 130C. for continuous operation. Type H - High temperature, 180C. for continuous operation. 2; APPLICABLE DOCUMENTS 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
4、 herein: SPECIFICATIONS FEDERAL PPP-B-636 - Box, Fiberboard. MILITARY MIL-Y-1140 - Yarn, Cord, Sleeving, Cloth and Tape, Glass. STANDARD MILITARY MIL-STD-129 - Marking for Shipment and Storage. (Copies of specifications, standards, drawings, and publications required by suppliers in connection with
5、specific procurement functions should be obtained from the procuring activity or as directed by the con- tracting officer. ) 2.2 Other publications. - The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of
6、invitation for bids or request for proposal shall apply. AMERICAN SOCIETY FOR TESTING AND MATERIALS (AsrrvI) D580 - Tests and Tolerances for Woven Glass Tapes. D638 - Test for Tensile Properties of Plastics. (Application for copies should be addressed to the American Society for Testing and Material
7、s, 1916 Race Street, Philadelphia, Pa. 19103.) ff - THIS DOCUMENT CONTAINS /y PAGES 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed
8、to the Official Classification Committee, One Park Avenue (Technical society and technical association specifications and standards are generaIly available for reference from libraries. They are also distributed among technical groups and using Federal agencies.) 3.1 Preproduction. - Glass banding t
9、ape furnished under this specification shall be a product for which reports of preproduction inspection (see 4.2) have been submitted to the Bureau of Ships and have been found acceptable. 3.2 Construction. - The insulating tape shall consist of non-woven parallel ECG 150-2/2 glass yarns- in accorda
10、nce with MIL-Y-1140 and impregnated and bonded with a thermosetting resin. The tape shall be furnished in the semi-cured (“Btt stage) state and shall be flat, dry and non-sticky, The surface may be slightly tacky but shall unwind freely from the spool without transfer of resin or glass strands. The
11、ther- mosetting resin shall be such that the treated tape may be completely cured (IC“ stage) after baking or +o 3 to 5 hours after the equipment reaches a temperature of 150C. The tape shall consist of 80 ends - per inch width. at 33rd Street, New York, N.Y., 10016.) i/ 3.3 The tape shall be put up
12、 in rolls over a 3-1/4 inch diameter core. The tape shall be furnished in lengths of 200 yards per roll with no splices per roll and with no layer separators. Alternate put-ups may be supplied if satisfactory to the procuring activity. The number of rolls shall be as specified (see 6.2). 3.4 Thickne
13、ss and widths.- The tape shall be furnished in the following thicknesses and widths, as specified (see 6.2): Nominal thickness. inches Nominal width, inches 3/8 f 3/32 1/2 f 1/8 3/4 i/a 5/8 f 1/8 1 f 1/8 3.5 Pro ert values.- The insulating tape shall conform to the property values shown in table I (
14、quality conforman-ble III (preproduction tests). 3.6 Instruction for storage. - The insulating tape shall have a minimum shelf life of 6 months at 20C. (68F.). Except for short shipping periods, the tape must be stored at 4C. (40F.). Lower temperatures have no deteriorating effects. An instruction s
15、heet or label shall be included with each roll of tape giving complete sorage instructions. 3.7 Workmanship. - The insulating tape shall be manufactured in a careful and workmanlike manner. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. - Unless otherwise specified in the contrac
16、t or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as QtherWiSe specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to :.Other glass yarns with special finishes may be used ii sati
17、sfactory to the Bureau of Ships. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-24178(SHIPS) the Government. The Government reserves the right to perform any of the inspections set forth in the speci- fication: where such inspections are deeme
18、d necessary to assure supplies and services conform to prescribed requirements. 4.2 Preproduction inspection. - Preproduction inspection will be performed by the supplier prior to production. The tests shall consist of the hot banding test specified in 4.6.3 and the weight loss test specified in 4.6
19、.4. A report of the test shall be submitted in duplicate to the Bureau of Ships. The initial test shall suffice for all future production provided no change is made in the tape as tested. 4.3 4.3.1 Sampling for quality conformance inspection. - m. - All tape of the same composition, type and size ma
20、nufactured under essentially the same conditions within a period of 15 days aiid offered for delivery at the same time shall be considered a lot for purposes of acceptance inspection. 4.3.2 Sampling for visual and dimensional examination. - Samples of tape shall be selected from each lot for examina
21、tion of visual and dimensional characteristics in accordance with table I. The lot size and sample size shall be stated in terms of rolls Table I - Sampling for visual and dimensional examination. I Lot size number of rolls Sample size rolls to be examined 2 to 8 B to 15 16 to 25 26 to 40 41 to 65 6
22、6 to 110 111 to 180 2 3 .5 7 10 15 20 Acceptance number (defective) Rejection number (defective) 4.3.3 Sampling for quality conformance tests. - One fifth of the rolls selected for the visual ur dimensional examination shall be subjected to the quality conformance tests specified in table II; howeve
23、r, the smallest number of rolls selected for any sample shall be one. If the contract calls for delivery of two rolls or less, only one roll shall be selected. 4.4 Quality conformance inspection. - 4.4.1 Visual and dimensional examination. - Each of the samples selected in accordance with 4.3.2 shal
24、l be visually and dimensionally examined to verify compliance with the requirements of 3.2, 3.3, 3.4, 3.5, 3.6 and 3.7. Any sample roll having one or more dimensional defects shall be considered defective. If the number of defective rolls exceeds the acceptance number for that sample, this shall be
25、cause for re- jection of the lot represented by the sample. 4.4.2 Quality conformance tests. - Quality conformance tests shall be conducted on samples of material Results shall be averaged for each sample roll to determine conformance selected in accordance with 4.3.3. with this specification. If th
26、e average for any sample roll fails to conform with any requirement, this shall be cause for rejection of the lot. 4.5 Conditioning. - Materials shall be conditioned before being tested, as specified in table II or tabIe III. Provided by IHSNot for ResaleNo reproduction or networking permitted witho
27、ut license from IHS-,-,-Table II - Quality conformance tests for property values of banding tape. Number of specimen for 1 paragraph Test I each tviie Property t6 be tested Conditioning siiecimen (see 4.5) -I- inches I as required 4.6.1.3.1 I I- Resin content IA min. 14.6.1.3.21 - IA 5 Ends min. , o
28、bservation I *I I 3 A average, 17,000 average, 13,000 20,000 18, O00 E 1 6 8/13 O L Hot Breaking load (hot band) 4.6.3 3 -Materials, dimensions, and workmanshiii. ZCalculate from breaking load values and determine psi for information only Table III - Preproduction tests for property values of bandin
29、g tape. Property value Number of Test Test specimen for per paragraph I each type I specimen Conditioning Unit of (see 4.5.) value Property to be tested Type B TypeH -I- - I- Tensile strengt11 L/ Hot Breaking load (hot band) 4.6.3 4.6.3 I E400/200 average, pounds 10,000 15,000 Weight loss E400/200 a
30、verage 4.6.4 3 1 LCalculate from breaking load values and determine psi for information only. 4.5.1 EquipmeFt. - Conditioning chambers and baths shall be such as to maintain the specified tempera- ture plus or minus 2 C. and the specified relative humidity plus or minus 2 percent. Provided by IHSNot
31、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-2LlL8 59 W 999990b 0028690 9 W MIL-I- 241 7 8( SHIPS) 4.5.2 Designation. - Conditioning procedures shall be designated as follows: (a) A capital letter indicating the general conditions of the specimen; that is hum
32、idity, immersion, (b) A number indicating in hours the duration of the conditioning. (c) A number indicating in degrees centigrade the conditioning temperature. (d) A number indicating relative humidity whenever relative humidity is controlled. (Relative and temperature conditioning. humidity obtain
33、ed over calcium chloride shall be taken as zero. ) The numbers shall be separated from each other by slant marks, and from the capital letter by a dash. 4.5.3 Nomenclature. - The following letters shall be used to indicate the respective general conditioning: Condition A - As received; no special co
34、nditioning Condition E - The specimen shall be conditioned for the time and temperature specified. Examples : E - 6/130 - 6 hours, 130C. E - 168/180 - 168 hours, 180C. 4.6 Methods of tests. - The methods of test and procedures shall be as specified in 4.6.1 to 4.6.4, inclusive. Unless otherwise spec
35、ified herein, all tests shall be conducted under room conditions (23“C., 50 percent relative humidity). 4.6.1 General examination. - 4.6.1.1 The insulation shall be examined to verify that the dimensions, materials, labeling and work- manship are in strict conformance with this specification. (See 3
36、.2 through 3.7. ) 4.6.1.2 Methods of measurement sf dimensions. - 4.6.1.2.1 Thickness. - The thickness of the tape shall be determined in accordance with the method specified in ASTM D580. 4.6.1.2.2 Width. - The width shall be determined by the use of a standard steel scale graduated to read in 1/16
37、 inch. The tape shall be pressed flat on a smooth surface at the time of representative points on the material at least 1 yard apart and the maximum, minimum and average valves recorded. 4.6.1.3 Materials. - 4.6.1.3.1 Resin content. - The resin content shall be determined in accordance with the orga
38、nic content method of ASTM D580. When constant weight is attained calculate the loss in weight. 4.6.1.3.2 of glass in the tape. The samples resulting from the resin content test of 4.6.1.3.1 may be examined for actual ends content or new samples may be examined by use of a magnifier of approximately
39、 200 power. An therefore with this construction 1 end = 2 yarns = 4 strands. Number of ends. - The glass construction shall be examined to determine the number of ends - end is defined as a twisted and plied yarn. ECG 150 2/2 glass consists of 2 strands twisted and 2 yarns plied; 4.6.2 Bonding and c
40、uring. - The tape shall bond to itself after heating under pressure for 20 minutes at 150C. and shall be fully cured after heating 5 hours at 150C. 4.6.3 Tensile strength. - The tensile strength shall be determined on glass bands formed and tested using the split mandrel test jig. 4.6.3.1 Preparatio
41、n of samples. - Bands shall be prepared by winding the glass tape under 500 pounds minimum tension, per inch of width, flat and free from buckles, on to a split mandrel in accordance with figures 1 and 2. Eight turns shall be wound per band (8 layers of glass on each side) and each band shall be one
42、 inch wide. Two one-inch bands may be wound on the mandrel by using a center spacer ring 1/2-inch wide and 1/4-inch thick. Terminal joints in the bands may be made by applying a hot clean soldering . 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
43、MPL-I-24ll78 59 7771786 0028671 o MIL-I- 24178(SHIPS) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-24L78 57 997970b I028672 2 - MIL-I- 24178(SHIPS) a B Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
44、 IHS-,-,-iron to the material for approximately 15 seconds upon each part of a 3-inch lap. Start and termination of the bands shall be made 90 degrees from the horizontal split of the mandrel. After winding and terminating, the bands shall be cured on the mandrel for 5 hours at 15OoC. Bands prepared
45、 in accordance with the above procedure shall be known as “cold bands“. A release agent may be used to allow the cured bands to be removed from the mandrel. Hot banding samples will also be required. The procedure for sample prep- aration shall be the same as above except the tape shall be heated pr
46、ior to winding on the mandrel by using a heat lamp or other means sufficient to cause the resin to flow freely as the tape is wound on the fixture. The ends shall be securely tied during the curing (on the mandrel) cycle to prevent any slippage. 4.6.3.2 Tensile testing. - The tensile test shall be c
47、onducted in accordance with the procedure described in ASTM D638 using the glass band specimens, and a tensile test machine of a maximum of 30,000 pounds scale reading, and operating at a speed of O. 05 inches per minute. Where hot breaking load is required to be determined, the split ring test fixt
48、ure and the test band shall be preheated to 13OoC and the band strength or breaking load determined at this temperature whereas, (e) Application of glass bands to armatures is relatively easy and safe. 30.1.2 Banding tape with crosa threads. - Some commercially available tapes are made with cross so
49、lder may melt on steel wire bands. tlireas Of glass to prevent separation of unidirectional fibers. These cross threads result in some loss of strength of bands. Type B and type H tapes do not contain cross threads. 6 months. Exposure to temperatures above 20C. (68F.) for extended periods may make the tape useless. When its shelf life has passed, the resin has cured and it is no longer soft and pliable. Close watch of
