1、, MIL-N-BZZ 99999Ob LbbL 960 MIL-N-8288 1 27 October 1993 SUPERSEDING MIS4256 18 December 1991 MILITARY SPECIFICATION NITROSTARCH lis specflcaton is approved for use by ail Departments and Agencies of the Depanment of Defense. 1. SCOPE, 1.1 Scope. This specification establishes the requirements and
2、quality assurance provisions for a wet nitrostarch for the base charges of small explosive devices. This nitrostarch is of one type and one class and is prepared by nitrating a starch from which excess fats and pectin acid have been removed. 2. APPLICABLE DOCUMENTS 2.1 Govirnment documents. 2.1.1 Sp
3、ecifications, standards and handbooks. The following specifications, standards and handbooks iform a part of this document to the extent 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
4、Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS MILITARY MIL-A48078 Ammunition, Standard Quality Assurance Provisions, General Specification For Beneficial comments (recommendations, additions, deletions) and any pertinent dah which may be of use in imp
5、roving this document should be addressed to: Commander, Mian Head Division, Naval Surface Warfare Center, Stai-ion Branch (Code 8420), 101 Strauss Avenue, Indian Head, MD 20640-5035, by using the Standardization Document Improvement Proposai D Form 1426) appearing ai the end of this document or by s
6、ending a Mer. AMSC NIA FSC 1376 DISTRIBIPION STATEMENT A. Approved for public release; distribution is unlimited. O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-82881 9999906 I1976620 682 MIL-N-8288 1 STANDARDS MILITARY MIL-STD- 105 MIL-STD-
7、129 MIL-STD-286 MIL-STD-1168 Ammunition Lot Numbering DOD-STD-2101 Classification of Characteristics Sampling Procedures and Tables for Inspection By Attributes Marking for Shipment and Storage Propellants, Solid: Sampling, Examination and Testing (Unless otherwise indicated, copies of federal and m
8、ilitary specifications, standards, and handbooks are available from Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-5094.) 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications fo
9、rm a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. PUBLICATIONS CODE OF FEDERAL REGULATIONS (CFR) 49 CFR 100-199 Transportation (October 1, 1989 revision) (Application for copies should be addressed to the Superinten
10、dent of Documents, US Government Printing Office, Washington, DC 20402-0001 .) 2.2 Non-Government publications. The following document forms a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the i
11、ssue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D2905 Standard Practice for Statements on Number of S
12、pecimens for Textiles (Application for copies should be addressed to the American Society for Testing and Materiais, 1916 Race Street, Philadelphia, PA 19103-1 187). (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the document
13、s. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, sup
14、ersedes applicable laws and regulations unless a specific exemption has been obtained. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-82881 M Ob Lbb21 519 M MIL-N-82881 Requirement Water content, k by weight, minimum (M101) Nitrogen content,
15、 46 by weight (M102) Acetone insoluble material, % by weight, maximum (M103) Sulfates, % by weight, maximum (M104) Ash, 96 by weight, maximum (h4105) Heat stabiiity at 134.SoC, time in minutes, minimum (M106) 3. REQUiREMENTS 3.1 Manufacturing requirement. The nitrostarch shall be manufactured from c
16、ornstarch which, prior to nitrating, is chemically treated to remove excess fats and pectic acid. O Value Test Paragraph 20 4.6.1 12.75 - 13.00 4.6.2 0.40 4.6.3 0.05 4.6.4 0.40 4.6.5 50 4.6.6 3.2 Chemical requirements. The nitrostarch shall conform to the chemical requirements of table I when tested
17、 as specified Form (M107) Color (M108) Loss of weight at 100“C, 46, maximum (M109) Ignition temperature, minimum (Milo) TABLE I. Chemical reauirements, Non-caking powder 4.6.7 Light tan 4.6.7 2.0 4.6.8 15OoC 4.6.9 3.3 Physical requirements. The nitrostarch shall conform to the physical requirements
18、of table II when tested as specified. TABLE II. Phvsical requirements. II Requirement I Value I Test Paragraph II 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order (see 6.2), the contractor is responsible for the performan
19、ce of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by
20、the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
21、thout license from IHS-,-,-MIL-N-L m 9979906 1976622 455 m MIL-N-82881 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. T
22、he 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 contract. Sampling inspection, as part of manufacturing opera
23、tions, 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. 4.2 Classification of inspection. The inspection requirement
24、s specified herein are classified as follows: a. Quality conformance inspection (see 4.3) 4.3 Quality conformance inspection. 4.3.1 Inspection lot formation. A lot shall consist of one or more batches of nitrostarch produced by one manufacturer, in accordance with the same specification under one co
25、ntinuous set of operating conditions. Each lot shall consist of that quantity of nitrostarch that has been subjected to the same unit chemical and/or physical process intended to make the final product homogeneous. The lot shall comply with the provisions for submission of product samples as specifi
26、ed in MIL-STD-105. Lot number assignment shall be in accordance with MIL-STD-1168. When specified in the contract or purchase order (see 6.2), the provisions of MIL-A48078 shall apply. 4.3.2. Sample size. Quality conformance inspection sample size shall be as specified in the contract or purchase or
27、der (see 6.2). 4.3.3 Inspection. Quality conformance inspection lots or samples shall be subjected to the tests and examinations of 4.6. 4.4 Classification of characteristics. The characteristics verified by the tests and examinations herein are classified as critical, major, or minor in accordance
28、with DOD-STD-2101. Requirements for critical characteristics are identified by the symbol (C) and major characteristics by the symbol (M). The number following the classification symbol indicates the serial number of the characteristic. Requirements not annotated with a classification code are class
29、ified as minor. 4.5 Testing. CAUTION This specification covers sampling and testing of toxic and hazardous material. Accordingly, ail applicable safety rules, regulations and procedures must be followed in handling and processing the nitrostarch. Disposal of all chemicals and hazardous materials mus
30、t be in accordance with all local, state, and federal regulations. 4.5.1 Inspection equipment. Inspection equipment and its calibration, design and approval shall be as specified in the contract or purchase order (see 6.2). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
31、ut license from IHS-,-,-MIL-N-82881 4.6 Test procedure. All tests shall be performed using prescribed procedures for replicate e determinations given in standard analytical chemistry textbooks or ASTM D2905. Unless otherwise specified, all chemicals shall be reagent grade or ACS grade. It is recomme
32、nded that all test procedures be documented by Standard Operating Procedures (SOPS) for organizational use. (See 6.3 for use of equivalent test methods.) 4.6.1 Water content test. Accurately weigh 5.000 f 0.500 grams (g) of nitrostarch into an appropriate tared container, such as a 2.5-inch diameter
33、 aluminum cup or 4-inch watch glass. Then dry this sample over concentrated sulfuric acid in a desiccator to constant weight at room temperature. Approximately 48 hours is required to dry a sample of this size. The percent loss in weight of the sample shall be determined and recorded as percent wate
34、r content. The percent by weight of water content shall conform to the value specified in table I. 4.6.2 Nitrogen content test. The nitrogen content shall be determined using a nitrometer on a 1.0 g specimen of the dried nitrostarch used in 4.6.1. Testing of the specimen shall be in accordance with
35、Method 209.3.2 of MIL-STD-286. The percent by weight of nitrogen content shall conform to the value specified in table I. 4.6.3 Acetone insoluble material test. A 1.0 g specimen of the dried nitrostarch used in 4.6.1 shall be weighed to the nearest 0.1 milligram (mg) and transferred to a 250-millili
36、ter (mi) Erlenmeyer flask. The material shall be moistened with 10 ml of ethyl alcohol. A 150 ml portion of filtered, reagent grade acetone shall be added and this mixture shaken until solution is complete. The solution shall be filtered through a well prepared and tared Gooch crucible. Any residue
37、on the flask shall be transferred to the Gooch crucible by means of several small rinses of acetone. The excess of acetone in the crucible shall be removed by sucking air through for several seconds. The crucible shall be dried for 45 minutes in an oven maintained at 100 to 105 degrees Celsius (OC).
38、 Any increase in weight of the crucible shall be calculated as percentage of acetone insoluble materials. The percent by weight of acetone insoluble material shall conform to the value specified in table I. 4.6.4 Sulfates test. Weigh 20.00 f 0.10 g of the wet material and transfer it to a 250-mi bea
39、ker. Add 20 ml of reagent grade hydrochloric acid (sulfate free) to the beaker. Cover with a watch glass and digest on the steam bath for 1 hour. Add 75 ml of water to the beaker and continue heating on the steam bath for 1/2 hour. Filter the contents of the beaker through a #1 Whatman filter, and w
40、ash the residue on the filter 10 times with small portions of hot water. Collect the filtrate and washings in a 400-mi beaker. Dilute this solution to about 200 mi and bring to a boil on a hot plate. Add 10 mi of 10% BaCI, solution slowly by means of a pipette to the boiling sample. Digest solution
41、and precipitate on the steam bath for 3 to 6 hours. Then filter while hot on a #42 Whatman filter. Transfer all of the precipitate to the filter and wash well (6 to 8 times) with hot water. Transfer the filter paper and precipitate to a freshly ignited and tared crucible. Dry the crucible and conten
42、ts in an oven (70“ to 100C for 1 hour) and then ignite at 800C in a muffle. Cool the crucible and contents in a desiccator and weigh. 95 Sulfates as H,SO, = P x 42.02 W P = Weight of precipitate, g W = Dry weight of sample, g (calculated; see 4.6.1) where 5 Provided by IHSNot for ResaleNo reproducti
43、on or networking permitted without license from IHS-,-,-MIL-N-82881 The percent by weight of sulfates shall conform to the value specified in table I. 4.6.5 Ash test. The percent of ash shall be determined on a 1.0 g specimen taken from a sample of nitrostarch dried in accordance with 4.6.1. Place t
44、he dried specimen into a previously ignited and subsequently tared crucible, and weigh to the nearest 0.1 mg. Add, with gentle stirring, sufficient acetone (containing 5 percent by volume of castor oil (see 4.6.5.1) to gelatinize the nitrostarch (see 4.6.5.2). The crucible shall be gently ignited an
45、d then the nitrostarch shall be allowed to bum, without applying any further heat, until a charred residue remains. The ignition temperature shall be continued until no further change is noted in the contents. The crucible shall be cooled in a desiccator and reweighed. The gain in weight of the cruc
46、ible shall be calculated as percent ash. The percent by weight of ash shall conform to the value specified in table I. 4.6.5.1 Blank determination. A blank shall be run concurrently with the specimen on the same volume of reagents employed. The blank shall be ignited in the same manner as the specim
47、en. Any residue of ash found in the blank shall be subtracted from the ash found in the nitrostarch specimen. 4.6.5.2 Digesting of nitrostarch. If preferred, the nitrostarch may be digested in the crucible with nitric acid and then ignited directly. Avoid spattering of liquids while heating. Run a b
48、lank on reagents as specified in 4.6.5.1. 4.6.6 Heat stability at 134.5“C test. Heat stability of the nitrostarch shall be determined using 2.5 g samples. Each sample shall be tested in accordance with Method 404.1.2 of MIL- STD-286 at a temperature of 134.5“C. Record the time at which the methyl vi
49、olet test paper has completely changed to salmon pink. The recorded time shall conform to the value specified in table I. 4.6.7 Form and color tests. The nitrostarch shall be examined visually to determine the form and color. The form and color shall conform to the descriptions in table II. 4.6.8 Loss of weight at 100C test. From a sample of dried nitrostarch (see 4.6.1), place an approximately 0.6 g specimen in a tared test tube 80 mm long X 10 mm inside diameter.
