1、INCH POUNDS MIL-P-82944(OS) 24 April 1995 MILITARY SPECIFICATION PROPELLANT, SOLID, COMPOSITE This specification is approved for use by the Naval Sea Systems Command, Department of the Nv, and is available for use by all Departments andAgencies of the Department of Defense. 1. SCOPE 1.1 Scope. This
2、specification covers a solid composite propellant designated as NSWChH-EC-03 that is used in Aircrew Escape Propulsion Systems. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent
3、specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MILITARY MIL-P-2 17 Potassium Perchlorate
4、MIL-1-706 MIL-A-23950 Aluminum Powder, Spherical MIL-R-82657 Resin, Epoxy, Trifnctional MIL-P-82658 MIL-L-82661 Lecithin, Technical MIL-A-82667/2 Ammonium Perchlorate, Conditioned Iron Oxide; Ferric, Red Dry (Natural and Synthetic) Polymer, Liquid, Polybutadiene, Carboxyl Terminated Beneficial comme
5、nts (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Indian Head Division, Naval Surface Warfare Center, Standardization Branch (Code 8420), 101 Strauss Avenue, Indian Head, h4D 20640-5035, by using the S
6、tandardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by sending a letter. AMSC NiA FSC 1377 Distribution Statement A: Approved for public release; distribution is unlimited. Licensed by Information Handling Services MIL-P-82944 = 99999Ob L9992Lb OTb m
7、STANDARDS MILITARY MIL-STD-286 Propellants, Solid: Sampling, Examination and Testing (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-
8、5094.) 2.1.2 Other Government publications. The following other government publications form a part of this document to he extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation (see 6.2). PUBLICATIONS NAVAL SEA SYSTEMS COMMAND (Code Ident 10001) OD 12652
9、 Density of Viscous Material, Determination of (Application for copies should be addressed to Commanding Officer, Naval Ship Weapons Systems Engineering Station, NAVSEA Data Support Activity (Code 5H30), Port Hueneme, CA 93043.) NAVAL, AIR SYSTEMS COMMAND (Code Ident 30003) AS 2328 Isodecyl Pelargon
10、ate (Application for copies should be addressed to the Commander, Naval Air Systems Command, Code AIR-51 122E, Washington, D.C. 20361) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the d
11、ocuments which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unlcss othcrwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (6.2). CHEMICAL PROPULSION INFORMATION AGENCY (CPIA) Publicatio
12、n No. 2 1 JANNAF Solid Propcllant Mechanical Behavior Manual (Application for copies should be addressed to Chemical Propulsion Information Agency, The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 208 1 O.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM
13、 D600 Standard Specification for Liquid Paint Driers (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19 103.) 2 Licensed by Information Handling ServicesMIL-P-S2944(OS) 2.3 Order of precedence. In the event of a confli
14、ct between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article sample. When specified (see
15、 6.2), a sample shall be subjected to first article inspection (see 6.4) in accordance with 4.4. 3.2 Material. The material shall be a solid composite propellant as described herein. 3.3 accordance with Table I. Chemical composition and ingredients. The chemical composition and ingredients shall be
16、in TABLE I. Chemical composition and ingredients. Ammonium Perchlorate, Conditioned, 200 micron (see 3.3.1) Ingredient I Specification I Weight Percent I I =1 MIL-A-82667 12, Type 111, Class 1 Polybutadiene, Linear, Carboxyl Terminated Resin, Epoxy, Low Viscosity I 111 I 33*77 I MIL-A-8266712, Type
17、Ammonium Perchlorate, Conditioned, 13 micron (see 3.3.1 t MIL-P-82658 9.847 MIL-R-82657 0.503 I 111 I 28-36 I MIL-A-8 2 6 67 12. Type Ammonium Perchlorate, Conditioned, 6 micron (see 3.3.1) MIL-A-2 3 950, Type I, Class 2 MIL-1-7 06 Type I, Class 2 ASTM D600, Class B 1.5 2.25 0.06 Aluminum Powder, Sp
18、herical Technical Lecithin Pot ass i um Perc hl ora t e Iron Oxide, Ferric, Red Dry MIL-L-82661 0.3 MIL-P-2 17, 7.8 Grade A, Class 2 Iron Napthenate (6%) Isodecyl Pelargonate AS2328 I 3.45 3.3.1 Ammonium perchlorate ratio of particle sizes. Control of the propellant burning rate shall be maintained
19、by varying the ratio of weight fractions of the three kinds of ammonium perchlorate. The weight fractions are the weights of each kind of ammonium perchlorate divided by the total weight of all three kinds of ammonium perchlorate. The total amount of ammonium perchlorate shall be 74.29 percent of th
20、e formulation by weight. 3 Licensed by Information Handling ServicesMIL-P-82944 m 9999906 1797218 979 m . 3.3.1.1 Ammonium perchlorate particle size. The two kinds of ground ammonium perchlorate shall be made fiom ammonium perchlorate that meets the requirements of MIL-A-82667/2, Type III, Class 1.
21、The ground ammonium perchlorate used in the propellant shall also meet the following particle size requirements (see 4.6.5): 13 micron: - Min Microtrac (micron) 50% 6.0 19.0 6 micron: Microtrac (micron) 50% 3.0 8.0 - Min Max The interval of time elapsed between the analysis of the ground ammonium pe
22、rchlorate and propellant mixing shall not exceed 48 hours. 3.3.2 Binder, The control of the physical properties of the propellant shall be maintained by varying the amount polybutadiene polymer and epoxy resin. The amounts of each of these components shall be determined by adjusting the ratio of che
23、mical equivalents of the epoxy resin to the chemical equivalents of polybutadiene polymer. The value of this ratio should nominally be (0.90/1.00) f (0.10) based on the functional equivalence values from the vendors ingredient certifications. The curing rates of the propellant may be adjusted by var
24、ying the percent of the iron napthenate. The total amount of the epoxy resin, polymer, and iron napthenate shall remain constant at 10.41 parts by weight. 3.3.3 Formulation. The nominal values and nominal limits of the ammonium perchlorate ratio and the epoxy resin to polybutadiene polymer equivalen
25、ts ratio were determined experimentally. Decisions to vary these ratios fiom their nominal values and nominal limits shall be based on results of ballistic and physical properties obtained from previous batch history, trends indicated by statistical control charts or lot changes of raw materials, Th
26、e nominal limits of these ratios shall not be criteria for accepting or rejecting a propellant batch; only the resultant physical properties specified herein and the ballistic performance in the end item (rocket motor, rocket catapult, etc.) shall be propellant acceptheject criteria. 3.4 Physical pr
27、operties. The physical properties of the cured propellant shall conform to Table II when cured in accordance with 4.5.1. Test specimens shall be tested withim 30 days ailer the end of cure (see 4.6.3). TABLE II. Physical properties of cured propellant. Property Temperature, OF Elongation at maximum
28、stress, % -65I5 165I5 Tensile Strength, psi -65I5 775 165I5 Density, g/cm3 I 77I5 Minimum 10 10 10 440 90 70 1.725 Maximum - - - 1.765 4 Licensed by Information Handling Services MIL-P-2944 9999906 1999219 05 H 3.5 would prevent its use for the purpose intended. Workmanship. The material shall be un
29、iform, and free from contamination and foreign matter that 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Exc
30、ept as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the s
31、pecification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliancez All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the
32、contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the co
33、ntract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements; however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4
34、.2 Classification of inspection. The inspection requirements specified herein are classified as follows: a. First article inspection (4.4) b. Quality conformance inspection (4.5) 4.3 Inspection conditions. Unless otherwise spccified (see 6.2), all inspections shall be performed as specified in the a
35、pplicable test method of 4.6. 4.4 First article inspection. First article inspection shall consist of the examinations and tests of 4.6 4.4.1 Sampling. Unless otherwise specified in the contract (scc 6.2), a first article sample shall consist of one propellant batch produced with equipment and proce
36、dures intended for use in production. Propellant grains and samples shall be cured together in the same location at 170 f 5 OF for a minimum of 240 hours and until two consecutive Shore A hardness measurcmcnts, taken at least 24 hours apart, show no more than a 2 Shore A unit change. Test samples sh
37、all be forwardcd to an activity designated by the procuring activity (see 6.2) for first article testing. The sample shall be tested to determine, prior to starting production, that the contractors production methods are capable of producing propellant that complies with the technical require- ments
38、 of the contract. No process changes shall be made, subsequent to approval of the first article sample, without prior written approval of the procuring activity. Process changes shall include but not be limited to: a. A change in mixing vessel size or type b. A change in an ingredient manufacturer o
39、r ingredient manufacturers process 4.4.2 Failure. Failure of the sample to pass any test shall result in rejection of the first article sample. 5 Licensed by Information Handling ServicesMIL-P-82944 9999906 1999220 527 4.5 Quality conformance inspection. Quality conformance inspection shall consist
40、of the tests of 4.6. 4.5.1 Sampling. A quality conformance inspection sample shall consist of sufficient material fiom each propellant batch to perform the tests of 4.6. Samples shall be cast as specified in the contract (see 6.2). Propellant grains and samples shall be cured together in the same lo
41、cation at 170 f 5F for a minimum of 240 hours and until two consecutive Shore A hardness measurements, taken at least 24 hours apart, show no more than a 2 Shore A unit change. 4.5.2 Inspection lot. An inspection lot shall consist of a single propellant batch where a batch is defined as a blend of p
42、ropellant ingredients manufactured at one time in one mixer. 4.5.3 Failure. Failure of the sample to pass any test shall be cause for rejection of the lot. 4.6 Test methods. Unless an alternative inspection method is proposed, tests shall be performed using apparatus and procedures specified herein.
43、 Alternative inspection methods must be approved by the contracting activity prior to use in acceptance testing. 4.6.1 Formulation. Each ingredient shall be weighed to determine compliance with table I prior to mixing. Weights shall be measured with equipment having an accuracy off 1.0 percent of th
44、e ingredient weight specified in table I. 4.6.2 Density. The density of the cured propellant shall be detcrmined in accordance with OD 12652. 4.6.3 Mechanical properties. The mechanical properties of the cured propellant shall be determined in accordance with CPIA Publication No. 2 1, Uniaxial Tensi
45、le Tests at Constant Strain Rate. The class of test and specimen used shall be Class C. Test specimens shall be prepared and pulled at the applicable temperature and a crosshead rate of 2.0 inches per minute (see 3.4). Temperature conditioning: All test specimens shall be conditioned for a minimum o
46、f 3 hours at the applicable test temperature specified in Table II, prior to testing. The time from cutting the specimens to testing the specimens shall be no greater than 72 hours. Humidity conditioning: Stress specimens shall be conditioned for a minimum of 24 hours at less than 50 percent relativ
47、e humidity prior to test. Tests shall be conducted at less than 50 percent relative humidity. Specimens stored for future testing shall be stored at less than 50 percent relative humidity. The time from cutting the specimens to testing the specimens shall be no greater than 72 hours. 4.6.3.1 Defecti
48、ve specimens. Defective specimens which fail at the site of a void, a polymer rich pocket, or specimens which break outside the necked down straight section shall be discarded and replaced with another specimen. The replacement specimen will be used when making average data computations. 4.6.3.2 Cal
49、culations. Calculate and record the average values of the mechanical properties for a minimum of five test specimens at each temperature. 4.6.3.3 Data reduction. Data reduction shall be in accordance with CPIA Publication No. 21. 6 Licensed by Information Handling Services - MIL-P-2944 9999906 1999221 4b3 MIL-P-82944(OS) 4.6.4 Raw materials. Prior to mixing the ingredients, each raw material shall be tested in accordance with the applicable ingredient specification to determine compliance with 3.3. 4.6.5 Ammonium perchlorate particle size (ground ammoniu
