1、I MIL-P-18948B 13 999990b 1161173 615 INCH-POUND I I _ MILP-l8948B(OS) 15 Julv 1992 SUPERSEDING 10 November 1972 and Amendment 1 10 May 1974 MIL-P-l8948A(OS) MILITARY SPECIFICATION PROJECTILES, PRIMING, MARKING, AND GREASING OF %is specification is approved for use within the Naval Sea Systems Comma
2、nd, Department of the Navy, and is available for use by all Departments ana Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers that priming, marking, greasing, and preservation done by the manufacturers of the projectile bodies and related inert components for ammun
3、ition calibers 75mm through 16 inch. This specification is supplementary to the specification governing manufacture of projectiles under contract as listed in the applicable list of drawings and specifications (see 6.2). 1.2 Classification. The projectiles shall have one of the following grades of p
4、rotective coatings as specified in the contract or purchase order (see 6.2): Grade A - Adherent crystalline phosphate deposit and primer Grade B - Rust preventive compound 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards
5、 form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be 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). _ B
6、eneficial comments (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, 101 Strauss Avenue, Standardization Branch (0343), Indian Head, Maryland 20640-5035,
7、 by using the self addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. a FSC 1320 Licensed by Information Handling ServicesProvided by IHS
8、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-SPECIFICATIONS FEDERAL TT-C-490 IT-P-664 MILITARY MIL-C-450 MIL-P- 15024 MIL-C-16173 MIL-C-18487 MIL-P-22332 MIL-G-8 1322 STANDARDS MILITARY MIL-STD- 130 MIL-STD-650 MIL-STD- 1 168 Cleaning Methods for Ferrous Surface
9、s and Pretreatments for Organic Coatings Primer Coating, Synthetic, Rust Inhibiting, Lacquer-Resisting Coating Compound, Bituminous, Solvent Type, Black (For Ammunition) Plates, Tags and Bands for Identification of Equipment Corrosion Preventive Compound, Solvent Cutback, Cold Application Compound,
10、Gun Slushing Paint, Aircraft, General Purpose, Wide Temperature Range Grease, Aircraft, General Purpose, Wide Temperature Range, NATO Code Number G-395 Identification Marking of U.S. Military Property Explosive Sampling Inspection and Testing Ammunition Lot Numbering (Unless otherwise indicated, cop
11、ies of federal and military specifications, standards, and handbooks are available from: Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-5094). 2.1.2 Other Government publications. The following other Government publication forms a part of this document
12、 to the extent specified herein. Unless otherwise specified, the issue is that cited in the solicitation. COMMERCIAL ITEM DESCRIPTION A-A-1 830 Tape, Pressure-Sensitive Adhesive, Box Closure 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL-P-L
13、8948B 13 R 9999906 1161175 498 D MIL-P-l8948B(OS) (Application for copies should be addressed to: Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-5094). 2.2 Other publications. The following document forms a part of this specification to the extent spec
14、ified herein. Unless otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of DoDISS specified in the solicitation. Unless otherwise specified, the issues of the documents not listed in the DoDISS shall be the issue of the non-government documents
15、which is current on the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 Standard Test Method of Salt Spray (Fog) Testing (DOD adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia,
16、PA 19103.) (NonGovernment standards and other publications are normally available from the organizations that prepare or that distribute the documents. 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
17、between the text of this specification and the references cited herein, except for related associated detail specifications, specification sheets or MS standards, the text of this specification shall take precedence. Nothing in this specification, however, supersedes applicable laws and regulations
18、unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified, (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.4. 3.2 General. Each projectile shall be properly marked and the surfaces either adequately prepared and
19、 primed or thoroughly cleaned and protected. Projectiles smaller than 75mm shall be marked as specified on the applicable drawing. Projectiles of 75mm and larger shall be marked in accordance with this specification, except as may be qualified by the applicable drawings. 3.3 Marking. The marking sha
20、ll be stamped or otherwise suitably indented into the proper surfaces. The marking shall be legible and arranged and located in an orderly manner. The surfaces of empty projectiles on which marking may be required by this specification are the base plug, rotating band, body and windshield. The marki
21、ng to be stamped on these surfaces is given in table 1. Typical arrangements of marking for various types of projectiles are shown on figures 1 and 2. Where an identification mark is specified for any piece (see 6.2), MIL-STD-130 and MIL-P-15024 shall apply. Arabic numerals and upper case letters sh
22、all .be used. The size of characters used in marking shall be appropriate for the space available. In general, 75mm through 4 inch projectiles shall be marked with characters 0.125 inch high, 5-inch projectiles with characters 0.1875 inch high, and larger than 5-inch projectiles with characters 0.25
23、 inch high. Periods after abbreviations may be 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-omitted, but decimal points in fractional quantities and hyphens in compound words or abbreviations shall be shown. Marking Base Plug, if any Automated D
24、ata List (ADL) Number Serial NumberZone Symbol Rotating Band Automated Data List (ADL) Number Ammunition Lot Number TABLE 1. Marking of pro-iectiles. Example Remarks (see) Figure 2 ADL 537 1 1 -2838596B (if required) 123X ADL 10001-2838466-A Figures 1 and after cleaning, there shall be no evidence o
25、f contamination from residual cleaning compounds. 3.4.2 Phosphate coating. After cleaning, all ferrous metal surfaces of projectiles (except the band seat area) and removable components shall be evenly coated with an adherent crystalline phosphate film in accordance with the requirements of TT-C-490
26、, Type I, Class 1 or Class 2A. Coating weights shall be as specified in TT-C-490 unless otherwise specified (see 6.2). All the treated surfaces shall be thoroughly dry and clean without any contamination when the primer and other coatings are subsequently applied to the untreated phosphated surfaces
27、. 3.4.3 Exterior surface primer application. The exterior surfaces of the projectile body (including threads on nose for fuze protecting cap), windshield, and nose excepting the rotating band, threaded surfaces, seating surfaces, and surfaces designated by applicable drawings, shall be uniformly cov
28、ered with a primer. The primer shall conform to the revision of T-P-664 specified in the contract or order (see 6.2), or MIL-P-22332. Care shall be exercised in controlling the limits of primed areas in order to prevent the impingement of paint on any surface which is to remain unprimed. The primer
29、film shall be hard, tough, adherent, smooth, continuous and unbroken, and shall be thoroughly dry so as not to be damaged in any way at the time of packaging for delivery. NOTE: If revision A, B, or C of TT-P-664 is specified in the contract or order, the projectiles shall be air dried for a minimum
30、 of 72 hours prior to being tested for dry film thickness, adhesion, or salt spray resistance. If revision D of TT-P-664 is specified in the contract or purchase order, the projectiles should be heated to, and maintained at, a metal temperature of 150 degrees Fahrenheit (OF) for 30 to 45 minutes pri
31、or to being air dried for a minimum of 72 hours. Testing may then proceed in accordance with this specification. If the projectiles are not heated, they shall be air dried for a minimum of 144 hours prior to being tested for dry film thickness, adhesion, or salt spray resistance. 6 Provided by IHSNo
32、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-c MIL-P-189488 13 9999906 11b1179 033 MIL-P- 1 8948B(OS) 3.4.4 Interior surface primer application. The interior surfaces of projectiles and the applicable surfaces of base plugs, fuze adapters, and noses which will be
33、in contact with explosives after the projectile is loaded, shall be uniformly coated with a smooth, continuous, and unbroken surface of acid-proof black paint (cavity paint) conforming to MIL-C-450 Type I or II. To aid in preventing runs or sags in the paint, leave the closure plug out of the nose t
34、hreads for a minimum of 30 minutes or until the paint has lost its tackiness. The interior surfaces of windshields excepting threads shall also be painted. 3.4.4.1 Explosive compatibility. The interior surfaces of projectiles and the applicable surfaces of base plugs, fuze adapters, and noses which
35、will be in contact with PBX type explosives after the projectile is loaded, and the cavities of load dispensing projectiles (CHAFF, Illuminating, Improved Conventional Munitions, etc.) shall be coated with a smooth, continuous, and unbroken surface of primer, MIL-P-22332 or TT-P-4, that meets the fo
36、llowing reactivity requirements: The primer shall not react with plastic bonded, cast explosive, and the maximum volume of reactivity gas liberated shall be 2 milliliters per gram (ml/g) when tested in accordance with 4.6.3. 3.4.5 Coating of unprotected surfaces. Threads and seating surfaces of proj
37、ectiles, base plugs, nose adapters, fuze hole closures, and windshields shall be given a thin, even coat of a suitable nonhardening, rust inhibiting grease. The grease shall conform to MIL-G-81322 and shall be applied in such a manner so as to prevent oxidation of unprimed metal without contaminatin
38、g the primed surfaces. 3.4.6 NO-GO gaging of threaded surfaces. Threaded surfaces shall comply with NO-GO thread gaging requirements before application of phosphate coating and shall comply with all thread gaging requirements after application of phosphate coating. 3.5 Grade B protection. 3.5.1 Surf
39、ace preparation. When grade B protection is specified in the contract or purchase order (see 6.2), interior and exterior surfaces of the projectiles and removable components shall be thoroughly cleaned so as to be free of chips, dirt, scale, rust, grease, or other residues foreign to their compositi
40、on, and after cleaning, there shall be no evidence of contamination from residual cleaning compounds. Objectionable dirt residues include perspiration, residual welding or brazing fluxes, cutting or cooling compounds, buffing or grinding compounds, residual heat-treat salts, general factory contamin
41、ation from machines, floors, etc., dust and chemical deposits, and residues from etching solutions. Cleaning shall be carefully performed in strict accordance with the requirements of this specification. The applicable detail requirements for Type II of TT-C-490 for cleanliness of surfaces shall be
42、for all metallic surfaces. All surfaces shall be thoroughly dry when coated with the preservative. 3.5.2 Preservative application. All interior and exterior surfaces of the finished and cleaned projectiles and removable components shall be thoroughly and evenly coated with a rust preventive compound
43、. Unless otherwise specified in the contract or purchase order (see 6.2), the rust preventive compound shall comply with the requirements of Grade 1 of MIL-C-16173. The application of the 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-l8948B
44、(OS) preservative should follow the cleaning without delay, allowing only enough time for cooling of any heated parts to the proper temperature for preservative application. A thin, even coat of grease conforming to MIL-G-81322 shall be applied to all internal and external threads prior to the overa
45、ll application of the grade 1 compound specified above. 3.5.3 Method of preservative application. The preservative, at a temperature of 70 to 95“F, shall be applied to a film thickness of not less than 0.002 inch by any suitable method such as dipping, spraying, slushing, or brushing which will prod
46、uce a continuous, unbroken, even and uniform coating free of moisture droplets, air bubbles, or other inclusions. Excess preservative shall be drained from surfaces in such a manner as to avoid accumulation of the compound in cavities, apertures, and corners of the projectiles and components. During
47、 the entire period of preservative application, the projectiles and components shall be suitably supported or racked so that the protective film is undisturbed until dry and sufficiently set for handling and packaging. Coated parts which are subsequently heated to dry to set the preservative compoun
48、d shall be allowed to cool before handling. Just prior to packaging, any bare or uncoated spots which result from contact with supports or racks during the coating and drying procedure shall be touched up by brushing with additional preservative. 3.6 Dry film thickness. The thickness of the dry film
49、 coating (phosphate and primer) shall be within the limits specified in 3.6.1 through 3.6.3. 3.6.1 Exterior. Projectiles shall have a phosphate and primer coating of 0.0005 to 0.0012 inch thickness on all primed exterior surfaces. 3.6.2 Bourrelets. Projectile bourrelets shall have a phosphate and primer coating of 0.0005 to 0.0010 inch dry film thickness. If electromagnetic thickness gage readings exceed 0.0010 inch at the bourrelet, when tested in accordance with 4
