1、 INCH-POUNDMIL-DTL-32298 (OS) 08 July 2008 SUPERSEDING (see 6.6) DETAIL SPECIFICATION CASTING POWDER, PROPELLANT This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1.
2、SCOPE 1.1 Scope. This specification covers three types of casting powder for cast double base propellants. 1.2 Classification. Casting powder covered by this specification will be of the following types as specified (see 6.2): Type I Nitrocellulose to nitroglycerin ratio of 4.394 Type II Nitrocellul
3、ose to nitroglycerin ratio of 4.094 Type III Nitrocellulose to nitroglycerin ratio of 4.786 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification.This section does not include documents cited in other sections of this spe
4、cification, or documents recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements for documents referenced in sections 3, 4, or 5 of this specification,
5、 whether or not they are listed. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contra
6、ct. Comments, suggestions, or questions on this document should be addressed to DEPARTMENT OF THE NAVY, Indian Head Division, NSWC, Code E11G3, Document Control, 4072 North Jackson Road, Suite 106, Indian Head, MD 20640-5115 OFFICIAL BUSINESS, or emailed to amanda.pennnavy.mil. Since contact informa
7、tion can change, you may want to verify the currency of this information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC: N/A FSC 1376 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 2 DEPARTMENT OF DEFENSE SPEC
8、IFICATIONS MIL-G-155 Graphite, Dry (For Use in Ammunition) MIL-DTL-244 Nitrocellulose MIL-N-246 Nitroglycerine MIL-T-301 Triacetin (Glyceryl Triacetate) MIL-N-3399 2-Nitrodiphenylamine MIL-L-13788 Lead Salicylate DEPARTMENT OF DEFENSE STANDARDS MILITARY MIL-STD-286 Propellants, Solid: Sampling, Exam
9、ination, and Testing MIL-STD-1171 Acceptance and Description Sheets (For Propellants and Explosives) (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094
10、.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation or contract. DOCUMENTS NAVAL S
11、EA SYSTEMS COMMAND WS 23141 Carbon Black (Powdered) PUBLICATIONS NAVAL SEA SYSTEMS COMMAND OD 17118 Preparation of Casting Solvent for Solid Propellant OD 19477 Density Determination, Mercury Method, Casting Powder Provided by IHSNot for ResaleNo reproduction or networking permitted without license
12、from IHS-,-,-MIL-DTL-32298 (OS) 3 OD 19544 Determination of Burning Rate Versus Pressure from Propellant Test Slabs OD 19555 Manufacture of Solid Propellant Test Grain OD 24654 Evaluation Grain, 4.5-Inch Solid OD 25216 Screen Loading Density, Determination of OD 26254 Density of Casting Powder (Merc
13、ury-Macro Method), Determination of OD 27923 Nitroglycerin Determination Specific Gravity Method ( Application for copies should be addressed to the DEPARTMENT OF THE NAVY, Indian Head Division, NSWC, Code E11G7, Document Control, 4072 North Jackson Road Suite 106, Indian Head, MD 20640-5115 OFFICIA
14、L BUSINESS.) 2.3 Non-Government publications. The following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issue of these documents are those cited in the solicitation or contract. CHEMICAL PROPULSION INFORMATION AGENCY CPIA/PP8, March 1956, Pa
15、rt I, Nitrocellulose Base Propellants: Method of Determining the Tensile Properties of Solid Rocket Propellants. (Application for copies should be addressed to the Chemical Propulsion Information Agency, Applied Physics Laboratory, Johns Hopkins University, Johns Hopkins Road, Laurel, MD 20810.) 2.4
16、 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes ap
17、plicable laws and regulations unless a specific exemption has been obtained 3. REQUIREMENTS 3.1 Preproduction requirement. Before beginning casting powder manufacture, the contractor shall prepare a detailed description of manufacturing processes and equipment proposed for use. The contractor shall
18、receive written approval of processes and equipment prior to use (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 4 3.2 Materials. The materials used in the manufacture of the casting powder shall conform to the requireme
19、nts of applicable specifications unless specific approval in writing, covering a departure there from, has been obtained from the procuring activity prior to manufacture. 3.2.1 Nitrocellulose. The nitrocellulose shall conform to MIL-DTL-244, grade A, type I except that the nitrocellulose shall be ma
20、de from cotton linters. 3.2.2 Nitroglycerin. The nitroglycerin shall conform to MIL-N-246, type I. 3.2.3 2-Nitrodiphenylamine. The 2-nitrodiphenylamine shall be in flake form and conform to MIL-N-3399. The purity shall be determined by the titanous chloride method (4.3.2.1) or the bromination method
21、 (4.3.2.2). 3.2.4 Lead salicylate. The lead salicylate shall conform to MIL-L-13788. 3.2.5 Lead beta resorcylate. The lead beta resorcylate shall conform to the following: a. Total lead content on a dry basis shall be not greater than 41.3 or less than 39.7 percent. b. Beta-resorcylic anhydride on a
22、 dry basis shall be not greater than 56.5 or less than 53.7 percent. c. The drying loss shall be not greater than 3.00 percent. 3.2.6 Carbon black. The carbon black shall conform to Grade D of WS 23141. 3.2.7 Graphite. The graphite shall conform to MIL-G-155, grade III or IV. 3.3 Casting powder comp
23、osition (volatile-free basis). The casting powder composition shall conform to requirements shown in TABLE I. 3.3.1 Total lead content. The total lead content, derived from lead salicylate and lead beta resorcylate added to casting powder composition, shall be not greater than 2.75 or less than 2.25
24、 percent. 3.4 Total volatiles. The total volatiles shall be not greater than 1.00 percent. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 5 TABLE I. Casting powder compositions (volatile-free basis). Type I Type II Type III Type I
25、I & III Percent Permissible Percent Percent Permissible Ingredient (by weight) Variation (by weight) (by weight) Variation Nitrocellulose 74.70 By difference 73.70 76.10 By difference Nitroglycerine 17.00 1.00 18.00 15.90 1.00 2-Nitrodiphenylamine 2.00 0.15 2.00 1.80 0.20 Lead salicylate 3.00 0.25 3
26、.00 2.90 0.30 Lead beta resorcylate 3.00 0.25 3.00 2.90 0.30 Carbon black 0.30 +0.10, -0.00 0.30 0.40 0.10 Graphite (added basis) 0.04 0.01 0.04 0.04 0.01 3.5 Density. The density shall be not less than 1.625 grams per cubic centimeter (g/cc). 3.6 Granule dimensions. The granule dimensions shall be
27、an average length and diameter of 0.035 0.005 inch. The length-to-diameter (L/D) ratio of the granules shall be 1.00 0.08. The granules shall be nonperforated cylinders. 3.7 Chemical stability. The chemical stability shall be as follows: a. The slope at 100 minutes shall be less than 1.00. b. The ti
28、me to 100 millimeters shall be more than 100 minutes. 3.8 Screen loading density. The screen loading density shall be not less than 1.030 g/cc for Type I and shall not be less than 1.050 g/cc for Types II and III. 3.9 Heat of explosion. The heat of explosion shall be 930 20 calories per gram for eac
29、h type. 3.10 Evaluation grains (test specimens). 3.10.1 Physical properties. The physical properties at 77 3 Fahrenheit (F) shall conform to the requirements shown in TABLE II. TABLE II. Physical properties. Type I Types II & III Physical property Minimum Value Minimum Value Tensile strength 400 psi
30、 350 psi Elongation 40% 35% 3.10.2 Burning rate. The burning rate at 1000 pounds per square inch absolute (psia) pressure shall conform to the requirements shown in TABLE III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 6 TABLE
31、 III. Burning rate. Temperature, F Rate, Inches Per Second -10 Not more than 0.06 below 70 rate Type I Types II and III 70 0.77 0.04 0.78 0.04 130 Not more than 0.05 above 70 rate 3.11 Data. The contractor shall prepare a test report with description sheets in accordance with MIL-STD-1171 giving a h
32、istory of ingredients and manufacture, including process control and summary sheets and evaluation and processing data (see 6.2). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Conformance inspection (see 4.4) 4.2 Lot. A
33、lot shall consist of material from one supplier manufactured under operating and processing conditions that shall make the final product a uniform blend. 4.3 Sampling. The minimum sample size shall be three containers. The containers selected shall be the primary samples representing the lot. A comp
34、osite sample, of sufficient size to perform the tests required by this specification, shall be made by blending equal portions from each of the selected containers in a blending barrel for a minimum of 30 minutes. The composite sample shall be placed in airtight containers and labeled with powder de
35、signation, manufacturer, plant, contract number, lot number, and lot size. However, if it becomes apparent during sampling that the lot is not uniform, the inspector may require that any primary sample be tested for conformance to this specification. All primary samples shall be retained for further
36、 testing should the composite sample fail to meet requirements (see 6.2). 4.4 Quality conformance tests. The following quality conformance tests shall be performed on each lot. Failure of any sample to conform to any requirement of this specification shall be cause for rejection of the lot. Where tw
37、o test methods are referenced, the first one listed shall take precedence. The percentage of all ingredients shall be calculated on a volatile-free basis. 4.4.1 Nitrocellulose. The nitrocellulose shall be determined in accordance with MIL-STD-286, method 209.2. 4.4.2 Nitroglycerin. The nitroglycerin
38、 shall be determined in accordance with MIL-STD-286, method 208.1. or by Liquid Chromatography, method 208.3.1. 4.4.3 2-Nitrodiphenylamine. The 2-nitrodiphenylamine shall be determined in accordance with MIL-STD-286, method 218.4, or by Liquid Chromatography, method 208.3.1. Provided by IHSNot for R
39、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 7 4.4.4 Carbon black and graphite. The carbon black and graphite contents shall be determined in accordance with the following procedure: a. Procedure. 1. Weigh a 3 gram(g) sample to 0.05 mg. Transfer to a 4
40、00 ml beaker 2. Add 50 ml of concentrated nitric acid to the beaker and sample and place on hot plate. Heat solution about 45 minutes or until sample is completely decomposed. 3. Remove beaker from hot plate, allow beaker to cool, add 50 ml of water and reheat. Continue heating until carbon black an
41、d graphite coagulate in bottom of beaker. 4. Filter through a tared fine selas crucible (Weight A). Wash with 2/1 ether/acetone solution. 5. Place crucible in 100 C drying oven for 2 hours. Allow crucible to cool and reweigh the crucible (Weight B). Weight gain (Weight B-A) is the total carbon black
42、 and graphite in the sample. 6. Place crucible on filtering apparatus and fill crucible with 20% sodium hydroxide solution. Turn vacuum on and the carbon black will flow through the crucible. Rinse crucible twice with additional sodium hydroxide solution and then with water. 7. Place crucible in 100
43、 C drying oven for 2 hours. Allow crucible to cool and reweigh (Weight C). b. Calculation: % Carbon black = graphiteweightSampleAWeightBWeight%100)(0.3)()(% Graphite = 100)(0.3)()(weightSampleAWeightCWeight4.4.5 Total lead content. The total lead content shall be determined in accordance with MIL-ST
44、D-286, method 311.1. The equivalence factor shall be 0.6833. 4.4.6 Total volatiles. The total volatiles shall be determined in accordance with MIL-STD-286, method 103.3 or by method 103.1.3. 4.4.7 Density. The density shall be determined in accordance with OD 19477, OD 26254, or by MIL-STD-286, meth
45、od 510.3.1 4.4.8 Granule dimensions. The granule dimensions shall be determined in accordance with one of the following procedures: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32298 (OS) 8 a. Sample preparation. Coat approximately three-f
46、ourths of one side of a microscope slide with a thin layer of light lubricating oil or petroleum jelly. Place a minimum of 20 granules, selected at random from a blended sample, on coated surface of microscope slide. b. Procedure. Use a Bausch and Lomb Illuminator, catalogue No. 42-63-58, or an opti
47、cal comparator, mounted so that granule shadow will project upon a flat surface perpendicular to axis of light beam. Adjust projector for sharp focus and calibrate projector magnification with a wire of diameter know to 0.0005 inch. Measure length and diameter of each granule to nearest 0.001 inch b
48、y measuring from knife-cut entrance to knife-cut entrance. c. Alternate procedure. Use a Bausch and Lomb Model MA chemical microscope, or equivalent, equipped with a calibrated 100 division ocular micrometer and with incident lighting on sample, to measure length and diameter of granules to nearest
49、0.001 inch. When ends of granules are irregular, determine average length by measuring from knife-cut entrance to knife-cut entrance. d. Calculation. Calculate and report average length and diameter dimensions of granules and L/D. L/D = diameterAveragelengthAverage4.4.9 Chemical stability. The chemical stability test shall be determined in acc
