1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - - . C-MIL-P-18842A (Nord) DRAWINGS B.REAU OF ORDNANCE 982521 20 mm Round, HEI 982523 20 mm Round, API 982619 20 mm ROUMI, Target Practice L, D, 172624 20 mm Gun Mochaniram, Mk 12 Mod, Q, Liat of Draw
2、ings, Subassemblies, etc. ORDNANCE CORPS D7553247 . SK HFSA-6290 SK #FSA-6563 A7 58459b Obturator A39430 Piston, Regular C78160 Gauges, Piston Hole Assembly . 14135720 Gauge, Piston Seat (Maximum and Minimum) A39436 Cylinder, Pressure, Small ArmrJ FB 22274 Gauge, Air Space, Small Arms Ammunition .I3
3、7643660 Reamer, Piston Hole FD14708 Jig or Drilling Caliber e 50, ,60, and 20 mm Cartridges, Assembly, and Details PD160 42 Primor Firing Device, Electric, for Ammunition Testing 76-4-46 - Box, Packing, Metal liner (Copper), M24, for Smokeless Pow dera 76-4-56 Box, PwMng, Metal-Wow, la17 for Smokele
4、ss Powders Actiori, Test, Caliber ,60 and 20 mm, Assembly, Liat of Parts and Drawings Gauge, Pressure, 20 mm, for Gun TI18 Barrel., Test, 20 mm, for Gun T118 C78589 Tool, Obturating Cup, Seating, and Knockout AsEtembly a 49-6-48 Rest, Recoil, Multiple Purpose PUBLICAT1C)NS ORDNANCE CORPS ORD-M688-PM
5、, Volume III, Manual of Test Methods for Small Arms (Copies of specifications, standards, drawings, and publicationa required by contractors in connection with specific procurement functions should be obtained from ths procuring agency or IS directed by that agency, Seo 6.4) Ammunition . 2,2 Other F
6、ublicitionEi. - irhe fdlotviiig docurlient forms u part of this Bpccification, Unless othorwilse indicated, the Baeua in effect on date of invitation for bids shall WPlY . Code of Federal In addition, the following material shall be of the type, grada or class specified: 3.1,1,1 Nitrocellulose. - Ni
7、trucellulose, Type I or II, grade C, of Specification . JAN-N-2-24:, made from cotton cellulose shall be used for small arms propellants, Nitrocellulose, Type I or II, grade C, made from wood cellulose ahall not be used unless prior approval of the procuring agency has been obtained. . . recovered f
8、rom scrap propellant rshall not be used without prior approval of tho procuring agency, 3.1, i. 2 Ethyl Alcohol, - Specification JAN-A-463, grade 2, 3,1,1,3 Graphite, - Specification JAN-(3-155, grade III or grade IV, 3.1.1.4 Diethyl Ether - Specification JAN-E-199, grade A or C, 3,1,1, 5 Potassium
9、Sulfate. - Speciication JAN-P-193, grade a, . . . Nitrocellulose 3.1.2 Rework Material . 3.1.2. i Normal Scrap, - Normal scrap colloid from mixers, blocking presses, *. extruding presse, cutting machines, and other first stage units, if any, prior to solvent recovery of drying shall be collected fre
10、quently into covered receptacles, keeping it soft with solvents. This scrap colloid, if clean and uncontaminated, maJr be used in the mixers, either separately.without limit or mixed with new nitrocellulose, It may be further softened, if. necessary, in a macerator. 3.1.2.2 Nard Scrap. - Hard colloi
11、d or hard rework of the same composition as material in process, from any operafion, or loose grain accumulating between solkent recoveiy and coating operation, if clean and not damaged by heat or sunlight also may be softened with solvents in a macerator and ased with new nitrocellulose in mixing,
12、. The qumtity shall be such as to produce n uniform colloid, but shall be imitecl to n inaximum of 10 per cent of the mixer charge. following nominal formula in parts by weight, exclusive of coating agents: - 3,l. 3 -n of Propellant. - The propellant shall conform to the Nitr ocellulos e 100.00 Pota
13、ssium Sulfate added 1.00 Diphenylamine added 1.00 I Basic Lend Carbonate aded O. 75 Upon prior approval of the procuring agency pulverized tin may bo substituted for basic lead carbonate, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-C-MIL-P-18942A
14、 (Nord) , coated with any of the following deterrcntB: dinitrotoluene, methyl ccntralitu, dibutyl phthalate, or mixtiires of them, The specific deterrent coating to be uscc1 will be specified by the procuring agency. The propellant shall be graphite glazed. 3.2 Limits on Added Chemical Constituents,
15、 - Limits shall be hold on tho added chemical constituents of the powclsr, ns apecificcl in Tcablc E in parts by weight, as determined by analysis, .In order to obtain the required ballistic characteristics, the propellant shall b TABLE I - Limits on the Chemical Additives in Parts by Weight, inclus
16、ive of Coating Agent Additive Chemical Constituent Maximum Minimum Potassium Sui rate 1.00 . 0.50 Basic: Lead Carbonate 1,oo O, 60 Riphenyl amine 1,oo 0.70 Deterrent (Coating Agent) 15.09 5.00 Tin 0.95 * o. 55 3.3 Form. - Cylindrical grains; single perforation. $4 External Moi - The bulk density of
17、the propellant irhall be such that linear compression of the propellant charge eatablishcd to develop the required velxity whalcll not exceed O, IO inch when tho propellant chgc is machine loaded ancl the. appropriate bullet: is seated to proper depth in the charged cam (me 6.3.2.) 3,91,1 Weight Var
18、iation, - The extreme variation in weight among 50 consecutive charges of propellant thrown from a loading machine of appropriqte type, using the determined weight of charge established in tho velocity firing, shall not be more than 10 graine, bctivccii exposure (See 6*3. 2), , K 4 -; z Provided by
19、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1- MIL-P-18942-A 1
20、3 m 999990b 0300045 4 /-7 C-MIL-P-18942A (Nord) 3,14.8 Sieving and ClcaninP,- - The propellant shall be sieved and cleaned to remove doublets ,- clusters , tailings, short cutrJ, splinters chipa, du a new lot, The lot number sfid1 be affixed with the letter to indicate rtrcatment, and the lot shall
21、be Bubjected to n complete acceptance teat. 4,2 Sampling.- The Govertafient impectos shall iolelcct six boxes at random from a low Ember through to a hig!i number. From each selected box the quantities of propellant Cap,ecfed in Table III shall be taken, Ciiemlcal Ballistic Surveillance Loading c f
22、lb s 11, 1. lb . 3 Pb 8ttmpling iihall bo diio with caro not to iiandlc the propellant graitins with the hands or alhuw th opcii boxes to become cafitaminated. Samples for all four categorim of Table IXF shall be prepared by camlining the material from the six boxea. Pn each case, the container for
23、the composite should be labeled with the correct sample type inriic:it;ccl in Table III, The %hernicaP and %allistitY1 samples ahould be eealed with a Govornmeiit seal. The surveillance mmples shall be diipped to the Naval Powder Factory, Mian Head, Maryland, for Navy rriateial and to other designat
24、ed points as required for Army material. The loading sample shall be used or testing, m:iehino loading, ejection time (hang-fire) , and fouling characteristics, When 7 . - ,- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for Resa
25、leNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-P-IIBA 13 W 9777706 03000Y7 1
26、 f 7. C-MIL-P-18942A (NCkd) i c i .* 15 grains aove ancl below tliis leve PIN? omt roumi of eacii. eieve-rov.aci artc-e been broken in by firing a Eiuffcient number of cutting rmnds ftb eliminate erratic? velocities caused by wearing of the barrel) hefore firing the master powder, I If uring the mas
27、ter powder firing, any individual barre! produce8 bailhtics that are : - significantly different at the 05 level of confidenee from: the other barrels, the results from that barrel shall be disregarded. A new bar the over-service charge I pressure shall be assumed not to fall below the linear extrap
28、olation through the I . below-service and near-service charge pressures. . I 4.5 Retest and Rejection. - Should aslot of powder fqil to pass one or more of the tests specified, the inspector shall notify the manufacturer, and upon the request of the manufacturer shall repeat the failing test or test
29、s, At the time the repeated test or tests are made, the same test or tests shall be made with the master powde and the results obtained shall be used aa the basis of comparison for judging the chiracteristics of the lot of powder, Should the master powder fail to give results complying with the spec
30、ification, the Government Inspector ahall invcstigate the conditions of testing, a8 well as the master powder in order to determine and to remove the cause of failure before proceeding with the repeated test or tests of the lat of powder for acceptance. If tz lot of powder fails to pass the required
31、 retest or retests, as described above, it shall be rejected. 5. l?REPARATION FOR DELPVERY 5.9. Packing, - The puwder shall be packed in accordance with on6 level as follows 6,f, 1 Level B, - The powder shall be packed in clean containers complying with tli applicable drawing specified in 2 1, OP as
32、 otherwise approved by the procuring .agency. All containem shall be tested with compressed air for air tightness by the I manufacturer, Containers conforming to Drawing 76-4-46 shall withstand an intern pressure of 1/2, to 1 psi for 1 minuto without leakage, . 5,2 Marking; Marking to insure safe ha
33、ndling shall be in accordance with Inter- state Commerce Commission Regulations for Transportation of Explosives and Other Dangerous Articles. Each container shall be harked as prescribed in MIL-STD-129 with additional marking indicating purchase order or contract numbe ,place and date packed, lot n
34、umber, name, typo and class of powder, and the particular ammunition for which the contained powder is intended. , NOTES 6,1 Ordoring Data. - Invitation for bid# and contracts or orders should specify th6 title, number, and dato of this military Specificrttion. . , . I I r I . ;, * !- I 1.9 Provided
35、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t O . 2 Altllougl podr iril iiaridly furt4;3ng ia i- I titam respects may be procured undsr this militaq Speciic, usually after the first five lots have been produced consecutively at the i . facility involved,
36、 for purposes of contiiiuing procurement, the tests for compliance i with the requirements of 3.7, 3. li, 9.11. I, - 3.12,1, 3.12.2 or any of them, may . 5 be waived upon authorization of the procuring agency, Inspector, the inmufacturer may, upon nuthcrity of the contracting officer, take for his o
37、wn use samples of the powder in similar quantities and in like mann and tho fact that tho Government may have foimulattccl, furnished, OF in any way sppierl the said drawings, specifications, 01 other ctata ia IIQ to be regarded by iinplicstiuns OP otherwise t% in any marner licensing the holder or any other persan OP corpoatin or conveying my rjglit or permissnioia ta raiuacture, um, or pll any patented inventions .that may In any way be related thel*cto* . . . _- . II Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
