1、klL-H-18911A (OS) 27 February 1974 SUPERSEDING MIL-H-18911 (Nord) 3 August 1955 See Section 6 MILITARY SPECIFICATION HEADS AND MOTORS, ROCKET, INERT PARTS, PAINTING AND MARKING This specification is approved for use by all deparmtents and agencies of the Department of Defense 1. SCOPE 1.1 This speci
2、fication covers the painting and marking of all types of rocket heads and motors by the manufactwer of inert parts. (See 6.1.) 2, APPLICABLE DOCLJMENTS * 2.1 The following documents of the issues in effect on date of invi- tation for bids or request for proposal form a part of this specifica- tion t
3、o the extent specified herein. SPECIFICATINS Fede ra 1 IT-C-490 Cleaning Method and Pretreatment of Ferrous Surf aces for Organic Coatings IT- 1-55 8 Ink, Marking Stenci 1, Opaque, for Nonporous Surfaces (Metals, Glass, etc.) IT- L- 32 Lacquer, Cellulose Nitrate, Gloss, for Aircraft Use TT-P- 175 7
4、Primer Coating, Zinc Chromate Low Moisture- Sensitivity . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I I MIL-H-18911A (OS) Eli lit ary MIL -C- 45 O Coating-Compound, Bituminous Solvent Type, Black (For Ammunition) MIL- P- 3420 Packaging Material
5、s, Volatile Corrosion Inhibi tor, Treated, Opaque Chemical Conversion Coatings on Aluminum and Aluminum Alloys MIL-C-5541 MIL-1-8574 Inhibitors, Corrosion, Volatile, Utilization of MIL-A-8625 Anodic Coatings, For Aluminum and Aluminum Al 1 oys MIL- P-15024 Plate, Tags and Bands for Identification of
6、 Equipment MIL-C-16173 Corrosion Preventive Compound, Solvent Cutback, Co 1 d- App li cati on MIL-P-16594 Projectiles, Bombs, Rockets, and Guided Missile Warheads, Inert Parts, Manufacture of MIL-E-16663 Enamel, Semi-Gloss (For Metal Surfaces of Ammunition and Ammunition Containers) MIL-H-19050 Head
7、s, Rocket, Penetrative, Manufacture and Inspection of MIL-P-22332 Paint, Priming, Exterior and Interior (For Ammunition) “ Grease, Aircraft, General Purpose Wide Tempera- ture Range MIL-G-81322 STANDARDS Federal FED-STD-595 Colors Mi lit ary MIL-STD-105 Sampling Procedures and Tables for Inspection
8、by Attributes MIL-STD-130 Identification Marking of U. S. Military Property Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-1B9LltA 13 = 9977906 04186Y7 = MS 603 MIL-H- 18911A (OS) Formula for Fuze Thread Luting (For Special Ammunition Use) MIL
9、- STD- 709 Ammunition Color Coding (Copies of specifications and standards required by contractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 General. * 3.1.1 All surfaces protected. A
10、ll surfaces of rocket head and rocket motor components shall have either paint or rust preventive coatings applied except those surfaces specifically exempted by applicable para- graphs of this specification or by the applicable drawings. ments of MIL-P- 16594 regarding discrepancies, See require- *
11、 3.1.2 Dimensions of painted components. The dimensions and tolerances of all rocket components required to be painted shall apply prior to the application of the paint coatings. * 3.2 Material. All material used shall comply strictly with the speci- fications and requirements listed herein and with
12、 the specifications and requirements shown on the applicable drawings prior to their use. * 3.3 Surfaces to be painted. The surfaces to be painted shall be those specified in this specification or as indicated on the applicable drawings. Care shall be exercised in controlling the limits of painted a
13、reas in order to prevent the impingement of paint on any surface which may be specified, either herein or on the applicable drawings, to remain unpainted. * 3.4 Surfaces not to be painted. Threads, electrical contact and elec- trical insulation surfaces, seating surfaces, bearing surfaces, bourre- l
14、ets, retaining grooves, and such other surfaces as may be specified on the applicable drawings shall not be painted. treatment of unpainted surfaces shall be as specified in 3.6 and 3.8.2. Unless otherwise specified plated surfaces shall not be painted. The final protective I 3 Provided by IHSNot fo
15、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-18911A (OS) I 3.5 Preparation of surfaces to be painted. * 3.5.1 Steel surfaces. The surfaces of steel parts requiring painting shall be cleaned and otherwise prepared for painting in strict accordance with the requir
16、ements of T-C-490. I * 3.5.1.1 Not-go gaging of steel threaded surfaces. Unless otherwise specified, steel threaded surfaces of parts which are to be prepared in accordance with T-C-490 shall comply with not-go thread gaging require- ments before application of phosphate coating in accordance with T
17、T-C-490 and shall comply with all thread gaging requirements after application of phosphate coating. Prior to use of not-go gages, care shall be exercised that threads are clean and free from rust, chips, or other foreign matter. I * 3.5.2 Aluminum surfaces. Surfaces of aluminum parts shall be anodi
18、zed For alumi- in strict accordance with MIL-A-8625 and immediately thereafter painted as specified in the applicable portions of this specification. num rocket motor tubes which are required to be anodized, the inspection specimen for determination of compliance with MIL-A-8625 shall be a suit- abl
19、e portion of a motor tube which has been anodized. approval of the procuring activity, chemical coating in accordance with MIL-C-5541 may be applied to aluminum parts to be painted. Upon specific I 3.5.3 Nonferrous metallic surfaces (other than aluminum). Surfaces of nonferrous (other than aluminum)
20、 metal parts shall be prepared for painting as directed by the procuring actiiity or as specified on the app li cab 1 e drawing . 3.6 Preparation and treatment of unpainted surfaces. * 3.6.1 Threaded, bearing, and seating surfaces of metallic components. All threaded, bearing, and seating surfaces o
21、f metallic components shall be cleaned and prepared for protective treatment the same as specified in 3.5 for surfaces to be painted. Unless otherwise specified in the applicable drawings, protective treatment in accordance with 3.6.1.1, 3.6.1.2, or 3.6.1.3, as applicable, shall then be applied. det
22、ail requirements for cleanliness of ferrous surfaces of T-C-490 shall be met prior to application of protective treatment. The applicable * 3.6.1.1 Permanent assemblies. The mating threaded, bearing, and seating surfaces of metallic components which are to be permanently assenbled by the contractor,
23、 as indicated on the applicable drawings, shall, prior to assembly, be coated with fuze thread luting compound in 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H- 18911A (OS) accordance with MIL-STD-603. After assembly, care shall be taken th
24、at the detail requirements of TT-C-490 for cleanliness of adjacent surfaces which are to be painted subsequent to assembly are complied with. * 3.6.1.2 Semipermanent assemblies. The mating threaded, bearing, and seating surfaces of metallic components of semipermanent assemblies, as indicated on the
25、 applicable drawings, shall, prior to assembly, be coated with grease conforming to MIL-G-81322. A thin, even, continuous film shall be applied, covering all applicable surfaces. (Semipermanent assemblies are assemblies made by the contractor which are disassembled at ammunition depots or in the fie
26、ld). CAUTION: nents thereof which are required to be coated with grease and which are adjacent to the interior cavity paint coated surfaces of the rocket heads (see para 3.8.1) shall be sparingly coated with a thin, even, continuous film of bearing grease, MIL-G- 81322, avoiding contact with the cav
27、ity pairit coating. Threaded and other surfaces of rocket heads and compo- -x 3.6.1.3 Components not assembled with mating components. Threaded, bearing, and seating surfaces of components not assembled by the con- tractor with mating components shall be coated with bearing grease, MIL-G-81322. A th
28、in, even, continuous film shall be applied, covering all applicable surfaces. 3: 3.6.2 Metallic surfaces other than threaded, bearing, and seating surfaces. Electrical contact, bourrelet, retaining groove surfaces, and the like of metallic components required to remain unpainted shall be cleaned and
29、 prepared for protective treatment the same as specified in 3.5 for surfaces to be painted. Unless otherwise specified, a thin, even, continuous film of rust preventive compound conforming to MIL-C- 16173, grade 2, shall then be applied, covering all applicable surfaces. The applicable detail requir
30、ements for cleanliness of ferrous surfaces of TT-C-490 shall be met prior to application of rust preventive compound, 3.6.3 Nonmetallic surfaces. Surfaces of nonmetallic components, except those surfaces intended to be in contact with high explosives, chali not be painted or otherwise treated. nonme
31、tallic surfaces intended to be in contact with high explosives. See 3.8.3 for tratment f * 3.7 Preparation and treatment of nonthreaded permanent steel-aluminum assemblies, Mating surfaces of permanent nonthreaded assemblies involving 5 Provided by IHSNot for ResaleNo reproduction or networking perm
32、itted without license from IHS-,-,-MIL-H-3873LA 13 7777706 0438650 = I I I MIL-H-18911A (OS) steel in contact with aluminum shall-, prior to assembly, be cleaned and prepared in strict accordance with 3.5.1 for steel surfaces and 3.5.2 or aluminum surfaces. surfaces shall be coated with primer, TT-P
33、-1757; see 3.9 or 3.10, as applicable. to assure complete separation of steel from aluminum surfaces shall be applied between the mating steel and aluminum surfaces. coating shall be applied, after assembly, as specified in this specifica- tion for the applicable surfaces. After preparation, the ste
34、el and aluminum mating On assembly, unbacked zinc chromate tape of sufficient width The final cover 3.8 Rocket heads and component parts thereof, interior surfaces, * 3.8.1 Metallic surfaces in contact with high-explosive fillers. After cleaning and preparation of surfaces in strict accordance with
35、the appli- cable portions of this specification, all interior metallic surfaces of each rocket head assembly, including the head cavity wall, and the appli- cable surfaces of base plugs, fuze adapters, and fuze liners, which will be in contact with high explosives after the head is loaded, as indica
36、ted on the applicable drawings, shall be completely covered (as evidenced by a dense biack appearance on all areas so specified to be covered) with acid-proof black paint (cavity paint) conforming to NIL-C-450 or MIL-P- 22332. Special precautions shall also be taken that internal cavities of rocket
37、heads are thoroughly purged of all solvent vapors from the cavity paint and that the paint film (MIL-C-450 or LIIL-P-22332) is thor- oughly dry and hard (see 3.16) before the cavity is sealed for shipment as specified on the applicable drawings. 3.8 cives. rocket - .2 Metallic surfaces in contact wi
38、th fillers other than high explo- Unless otherwise specified, the interior metallic surfaces of head assembles, incuding the head cavity wall, and the applicable surfaces of base plugs, fuze adapters, and fuze liners intended to be in contact with special purpose fillers other than high explosives s
39、hall not be painted. 3.8.2.1 Steel surfaces. Immediately after cleaning and surface prepara- tion, the applicable steel surfaces shall be protected against subsequent corrosion by inserting a 4-ply tube of material conforming to MIL-P-3420 and immediately sealing the cavity securely by means of the
40、blugs or other closures as specified in the applicable drawings. Unless otherwise specified, the tube shall be 0.750 f 0.0625 inch O.D. and 0.012 inch minimum wall thickness, with length as specified in the applicable draw- ings. Except as specified above, the general requirements of MIL-1-8574 shal
41、l be complied with, I 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-18911A (OS) 3.8.2.2 Metallic surfaces other than steel. The applicable metallic surfaces other than steel shall be treated as specified in the applicable drawings or as spe
42、cified by the procuring activity. 3.8.3 Nonmetallic surfaces. Surfaces of nonmetallic components intended to be in contact with high explosives after the head is filled shall be painted as specified for metallic surfaces in 3.8.1. 3.9 Painting of rocket heads and component parts thereof, exterior su
43、rfaces. * 3.9.1 Metallic surfaces. Exterior metallic surfaces of rocket head assemblies and accessories, such as shipping plug and thread protectors, required to be painted as indicated on the applicable drawings, after having been cleaned and prepared for painting in accordance with the appli- cabl
44、e portions of this specification, shall be painted with one coat of zinc chromate primer conforming to TT-P-1757 followed by one cover coat of semi-gloss enamel conforming to MIL-E-16663. primer shall be not less than 0,0003 inch and not more than 0.0007 inch. Dry-film thickness of the enamel shall
45、be not less than 0.001 inch. Dry-film thickness of the 3.9.1.1 Exterior surfaces of rocket heads to contain explosive. For rocket heads which are to be used with high explosive fillers only, i.e., for those rocket heads in which the interior surfaces are coated with cavity paint in accordance with 3
46、.8.1, the exterior surfaces of the detail piece which has the cavity paint coating shall, unless otherwise specified by the procuring activity, be coated with primer only in accor- dance with 3.9.1, omitting the final enamel cover coat. The exterior surfaces of accessories for these heads, such as s
47、hipping plugs and thread protectors, shall, unless otherwise specified, be completely painted with primer and cover coat in accordance with 3.9.1, CAUTION: Since the rocket heads are to be painted subsequently with the final cover coat by the loading depot, after high explo- sive loading, special pr
48、ecaution shall be taken that the prime coated surfaces of the rocket heads are free from grease, dirt, or any other contamination which would prevent firm adhesion of the final cover coat to the prime coated surfaces. .K 3.9.2 Color of final coating. The color of the final coating shall be in accord
49、ance with MIL-STD-709. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-H-L893LA 3r3 U 9799906 0438652 I = I MIL-H-18911A (OS) * 3.10 Painting of rocket motors. * 3.10.1 Painting of rocket motors and component parts thereof, interior surfaces. Interior surfaces of rocket motors required to be painted shall, after cleaning and preparation for painting in accordance with this sp
