1、MIL-T-23132A 13 7777706 0303068 7 MIL-T-23132A (AS) 16 June 1972 SUPERSEDING MIL-T-23132 (Wep) 21 December 1961 MILITARY SPECIFICATION TUNGSTEN DELAY COMPOSITION This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1, SCOPE 1.1 Scope. This specification cove
2、rs the minimum requirements for the procurement of tungsten delay composition. (See 6.1.) 1.2 Classification. The tungsten delay composition furnished under Burning time will be specified by the procuring activity. this specification shall be of five series, depending on the burning time range. (See
3、 6.2.) Series I 0.15 to 1.0 sec/in. at 25“ centigrade (C) Series II 1.0 to 5.0 sec/in. at 25“ C Series III 5.0 to 28.0 sec/in. at 25 C Series IV 28.0 to 33.0 sec/in. at 25“ C Series V 33.0 to 38.0 sec/in. at 25“ C . 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date o
4、f invita- tion for bids or request for proposal, form a part of this specification to the extent specified herein. SPEC I FICAT IONS Federal RR-S-366 Sieves; Standard, Testing. PPP-B-621 Box; Wood, Cleated- Plywood PPP- B-62 1 Box; Wood, Nailed and Lock Corner ;HIS DOCUMENT CONTAINS i PAGE; Provided
5、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-23132A 13 W 7799706 0303069 O MIL-T-23132A (AS) Mi li tam MIL-P-116 Preservation, Methods of MI L-P-2 17 Potassium Perchlorate MI L-B-550 Barium Chromate MIL-D-20550 Diatomaceous Earth MIL-P-22264 Powder
6、s, Ignition, Gas ess Naval Ordnance Sys tems Command (Code Ident 1000 1) OS 9765 Boron-Potassium Nitrate Naval Air Systems Command Code Ident 30003) AS 2686 Tungsten Metal Powder, Pyrotechnic STANDARDS Mi li tary MI L-STD- 129 MIL-STD-1234 Pyrotechnics : Sampling, Inspection an Marking for Shipment
7、and Storage DRAW I NG S Naval Ordnance Systems Command (Code Ident 10001) 2 249 36 2 2249363 Delay Body Test Element Loading Assembly 2249365 LD 518765 Test Element Output Charge Holder Loading Assemb ly PUBLICATIONS Naval Ordnance Systems Command (Code Ident 10001) OD 12051 Operating Instructions f
8、or Pyrotechni Timing Apparatus 7 Testing Jelay c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - MIL-T-23132A 13 9997906 0303070 7 MIL-T-23132A (AS) (Copies of specifications, standards, drawings, and publications required by suppliers in connect
9、ion with specific procurement functions should be obtained from the contracting officer.) 2.2 Other publications. specification to the extent the issue in effect on date shall apply. procuring activity or directed by the The following documents form a part of this specified herein. Unless otherwise
10、indicated , of invitation for bids or request for proposal Code of Federal Regulations 49 CFR 170-190 Hazardous Materials Regulations, Department of Transportat i on (Copies are available from the Superintendent of Documents , Govern- ment Printing Office, Washington, D. C. Orders should cite “the l
11、atest issue and supplements thereto.“) 3, REQUIREMENTS 3.1 Description. The tungsten delay compositions shall be homogeneous mixtures of tungsten powder, barium chromate, potassium perchlorate, and diatomaceous earth. corresponding burning time ranges in accordance with 1.2. Compositions shall be de
12、signated in series with 3.2 Materials. delay composition shall conform to the requirements of 3.2.1, 3.2.2, 3.2.3, and 3.2.4. The materials used in the manufacture of the tungsten 3.2.1 Tungsten powder. The tungsten powder shall conform to the requirements of AS 2686, type II. are considered the mos
13、t useful for the given burning time series. With proper adjustment of composition tungsten percentage, any particle size close to the suggested range may be used to achieve the desired burning time These tungsten particle size ranges 3 Provided by IHSNot for ResaleNo reproduction or networking permi
14、tted without license from IHS-,-,-NIL-T-23132A 13 m 777770b 0303073 7 m MI L-T-23132A (AS) Series AS 2686, class Average particle size, microns I 1 0.5 to (0.9 II 2 0.9 to (2.5 I II 3 2.5 to (5.0 4 5.0 to (10.0 IV V 4 + 1,2 5.0 to (10.0 or blend of coarse (5.0 - 10.0) and small amount of fine (0.5 -
15、 2.5) (10% - 25%) 3.2.2 Barium chromate. The barium chromate shall conform to MIL- B-550, class A, with the exceptions that the minimum purity shall be 97.5 percent, and 95.0 percent or more of the material shall pass through a U. S. No. 325 screen. The average particle size of the barium chromate s
16、hall be 5 microns or less as determined by 4.3.4. 3.2.3 Potassium perchlorate. The potassium perchlorate shall conform to MIL-P-217, grade A. lations of potassium perchlorate are suggested for optimum performance: In addition, the following percentages and granu- Series I II IIIA IIIB IIIC IV V Burn
17、ing time range, sec/in. 0.15 to 1.0 1.0 to 5.0 5.0 to 10.0 10.0 to 20.0 20.0 to 28.0 28.0 to 33.0 33.0 to 38.0 Percent KC104 5 5 5 5 10 10 10 KClO4 gr an u 1 at i on F* F* F* C* e* C* e* *3.0 to 8.0 micron FSSS *-1OOt200 mesh USS sieve 3.2.4 Diatomaceous earth. For all series compositions, 5. O perc
18、ent diatomaceous earth shall be used. requirements of MIL-D-20550, grade B. The diatomaceous earth shall meet the 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-23L32A 13 9999906 0303072 O -. MIL-T- 2 31 32A AS) 3.3 Formulation. The materia
19、l components forming the delay composi- tions shall be homogeneously mixed. are described in 6.4. Advisory manufacturing procedures 3.3.1 Composition. In order to meet the specific burning time char- acteristics required, the percentage composition by weight of the tung- sten delay composition shall
20、 be determined by pilot mixture. (See fig- ures 1 and 2 for effects of tungsten particle size and percentage tmg- sten.) Acceptance of the composition which conforms to the performance tests of 3.4, 3.5, and 3.6 shall be considered satisfactory compliance with the composition formulation. An advisor
21、y procedure for pilot mix- ture is given in 6.4.1 and 6.4.2. 3.4 Burning time at 24“ f 4“ C. The burning time of tungsten delay compositions shall conform to the basic time and tolerance designed in the drawings, specification, or contract as furnished. The burning time of tungsten delay composition
22、s is an average time ascertained under the provisions of 4.3.2. The percent coefficient of variation (C.V.) of observed burning times shall be not greater than indicated below for the ranges indicated. Seri es Burning time range, C.V., sec/in, % I 0.15 up to 1.0 7.0 (max.) II 1.0 up to 5.0 5.0 (max.
23、) IIIA, IIIB . 5.0 up to 20.0 4.0 (max.) IIIC, IV, v 20.0 up to 38.0 3.0 (max.) 3.5 Low-temperature functioning. The burning time shall not be increased by more than 20.0 percent when the initial temperature is changed from 24“ k 4“ C to -54“ k 2“ C. be applicable in determination of low-temperature
24、 functioning. The percent coefficient of variation of observed burning time shall be as specified in 3.4 at all required temperatures, The provisions of 4.4.3 shall 3.6 Delay performance. There shall be no delay failures at room temperature or at low temperature. A delay failure shall be a condi- ti
25、on where ignition powder ignites but the delay column does not burn through, Satisfactory performance of 4.3.2 and 4.3.3 tests with no delay failures shall constitute conformance to this requirement, 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
26、flIL-T-23132A 13 m 7779706 0303073 2 m MIL-T-23132A (AS) Seri58 I II III IV v I O 5 10 15 20. 25 30 35 Burning time (sec/in) FIGURE 1. EFFECT OF THE PERCENTAGE OF TUNGSTEN ON BURNIXG TIME FOR FIVE TUNGSTEN PARTICLE SIZES IV v _. III Seri551 - . . II _ - - . -_ -. I : , c Y- : I l i I I t II 1 O 5 10
27、 15 20 25 30 35 Burning time (sec/in) FIGURE 2. TUNGSTEN PARTICLE SIZE VERSUS BURNING TIME AT SIX DIFFERENT PERCENTAGES OF TUNGSTEN Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-23132A 13 7977906 0303074 4 MI L - T- 2 3 1 32 A (AS) 4. QUALITY
28、 ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the perform- ance of all inspection requirements- as specified herein. otherwise specified in the contract or order, the supplier may use his own or
29、any other facilities suitable for the performance of the inspec- tion requirements specified herein, unless disapproved by the Government a The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to assure suppli
30、es and services conform to prescribed requirements. Except as 4.1.1 Lot. A lot of tungsten delay composition shall consist either of a manufacturers batch which has been mixed as a unit from the ingre- dients or of a blend of one or more such batches. 4.1.2 Sampling. Sampling of the tungsten delay c
31、omposition for test purposes shall be performed following the last mixing operation and screening of the dried powder. Each lot (4;l.l) to be tested shall be divided into 20 equal parts and 20 delay bodies shall be so loaded that each delay body contains a representative sample from one of the 20 pa
32、rts without duplication (see 4.3.2). A second representative pooled sample of the delay composition is selected and a sufficient quantity to load a minimum of 10 test elements according to 4.3.2.1 for low-temperature functioning test (4.3.3). in delay assemblies shall be carried out in areas having
33、a relative humidity below 60 percent. sealed containers and correctly labeled to show the following information: All sampling prior to test loading or loading The samples shall be stored in hermetically (a) Name of item (b) Weight of sample (c) Lot number of delay composition (d) Manufacturer (e) Da
34、te of manufacture (f) Lot number and manufacture of each material component used in the delay composition. 4.2 Acceptance tests. Unless otherwise specified, the contractor shall conduct acceptance tests specified (4.3.2 and 4.3.3) in the pres- ence of the Government inspector to assure that the tung
35、sten delay composition is in compliance with 3.4, 3.5, and 3.6. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MT L-T- 2 3 132A (AS) 4.2.1 Test inspection equipment and facilities. The manufacturer shall furnish and maintain all necessary test equip
36、ment facilities and personnel for performing all acceptance- tests. lhi test equipment shall be of sufficient accuracy and quality to permit performance of the required acceptance tests. 4.3 Test procedures. 4.3.1 Ingredient testing. All ingredients shall be tested in accor- dance with the applicabl
37、e specifications with amendments and the excep- tions taken in section 3. 4.3.2 Burning time test for delay compositions, Conduct the test on The lot shall be the basis of each lot as provided in 4.1.1. consist of 20 test elements as provided in 4.3.2.1. divided into 20 equal parts, and 20 delay bod
38、ies shall be loaded so that each delay body contains a representative sample from one of the 20 parts without duplication. The sample for test chal-1 4.3.2.1 Loading of the test element, The delay body shown in Drawing 2249363 shall be loaded in accordance with Drawing 2249362. The tools required fo
39、r loading appear in drawings under LD 518765. The ignition increment F shall consist of approximately 160 milligrams (mg) of A-1A ignition powder conforming to MIL-P-22264 or 160 mg of composition con- sisting of 80 percent A-1A ignition powder (MIL-P-22264) and 20 percent BKNO3 ignition powder conf
40、orming to OS 9765, type II, class 3, and shall be adjusted to be within the drawing limits (0.060 rt 0.002 inch) for increment length when pressed at 30,000 I 500 pounds per square inch. Each increment may be measured volumetrically by means of a scoop of such size as to give six approximately equal
41、 increments. After the last increment, D6 is pressed, the loading funnel cap shall be loosened and tightened again. The D6 increment shall then be re-pressed to improve compaction and to minimize the danger of loss of powder by fallout. The surface of the delay column shall be flush with the end of
42、the delay element in which it is contained. Excess powder may be removed by slid- ing the end of the test element over a hard cloth. holder containing the PP charge shall be loaded in accordance with Draw- ing 2249365. The output charge 4.3.2.2 Timing of test elements. Suggested directions for mount
43、ing components into the delay body holder and assembling the test adapter are-given in OD 12051. temperature firing shall be within 24“ k 4“ C. The temperature of the test-elements for room If detailed directions. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
44、 from IHS-,-,-MIL-T-23L32A 13 7799906 0303076 m- MIL-T - 2 3 132A (AS) for testing at low and high temperatures are not specified for qualifi- cation of the powder, the following procedure shall be followed: test adapters shall be conditioned continuously for at least 2 hours at the required tempera
45、ture before firing. The 4.3.2.3 Procedure for operating test apparatus. It is suggested that NAVORD OD 12051, Operating Procedure for Pyrotechnic Delay Timing Appa- ratus, be used for operating instructions of the test apparatus. time observations obtained in 4.3.2.2. Compute the standard deviation
46、(S) of the time observations.* The symbols and the method of computation shall be governed by 6.3. Compute the percent coefficient of variation by dividing (100) x (S) by x. Disposition of the lot shall be governed by 3.4 and 3.6, Where lot rejection is on the basis of the percent coefficient of var
47、iation, or 3.6, the lot may be remixed and resubmitted for acceptance under all provisions of 4.3. 4.3.2.5 Testing after shipment or prolonged storage. After tungsten delay composition has been properly mixed, it is possible for the fuel and oxidants to segregate under conditions of storage and tran
48、sportation. Segregation appears to occur near the surface when a delay composition is subjected to prolonged agitation, particularly during shipment by rail. The surface layer is then nonhomogeneous and not representative of the composition of the lot, delay composition or after storage of the lot l
49、onger than 3 months, the lot should be reevaluated according to test procedures outlined in 4.3.2. If the lot fails to meet the requirements of 3.4 then the lot shall be remixed to restore uniformity prior to test and use. the provisions of 4.3.2 shall be followed to ensure representative sam- pling of the lot. After shipment of a lot of tungsten In all testing, 4.3.3 Low-temperature functioning test. Samp
