1、MIL-H-44099A 22 Decenber 1986 SU FERSED ING MIL-H-44 O9 9 23 March 1983 MILITARY SPEC IF IC AT1 ON HELMET, GROUND TROOPS AND PARACHUTISTS This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This document covers a ballistic protecti
2、ve helmet consisting of a laminated coated aramid cloth shell with a replaceable suspension assembly, headband, and chin strap. 1.2 Classification. The helmet assembly shall be of one type and in the following sizes as specified (see 6.2). X-Small Small Medium Large 2. APPLICABLE DOCUMENTS 2.1 Gover
3、nment documents. 2.1.1 Documents. The following documents form a part of this document 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 suppleme
4、nt thereto, cited in the solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to U.S. Army Natick Research, Development, and Engineering Center, Natick, MA 01760-5014, by u s i ng t h e s e
5、 1 f - ad d r e s s e d S t a nd a rdi z a t ion Do cume n t Impr ovemen t Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 8470 DISTRIBUTION STATEMENT A. Approved for public release; distribut ion is unlimited . Provided by IHSNot for ResaleNo reproduction or
6、 networking permitted without license from IHS-,-,-MIL-H-44077A 84 9779706 0379308 T SPECIFICATIONS FEDERAL DDD -L-2 O PPP-B-636 PPP-C-843 MILITARY MIL-R-3065 MIL-L -3 507 8 MIL-C-4 4050 MIL-S-44091 MIL-S-4 409 7 MIL-H-4 409 8 MIL-C-46 168 MI L-P- 4 6 5 93 STANDARDS FEDE AL FED-STD-5 9 5 MILITARY MI
7、L-STD-105 MIL-STD-129 MIL-STD -1 47 MIL-STD-6 62 MIL-STD-731 MIL-H-4 409911 - Label: For Clothing, Equipage and Tentage - Boxes, Shipping, Fiberboard - Cushioning Material, Cellulosic (General Use) - Rubber, Fabricated Products - Loads, Unit: Preparation of Semiperishable Subsistence Items; Clothing
8、, Personal Equipment and Equipage; General Specification For - Cloth, Ballistic, Aramid - Strap, Chin, Ground Troops-Parachutists Helmet - Suspension Assembly, Ground Troops -Parachut is ts - Headband, Ground Troops-Parachutists Helmet - Coating, Aliphatic Polyurethane, Chemical Agent - Projectile,
9、Calibers .22, .30, -50, and 20 mm Helmet Res is tant F r agmen t -S imula t i ng - Colors - Sampling Procedures and Tables for Inspection - Marking for Shipment and Storage - Palletized Unit Loads - Ballistic Test for Armor - Quality of Wood Members for Containers and by Attributes Pallets 2 Provide
10、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-4 409 9A DRAWINGS U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 2-1 -1 384 - 2-1-1 38 5 - 2-1-1386 - 2- 1 -1 40 O 8-2-644 - 8-2-645 - 8-2-646 - 8-2-647 - 8-2-661 - 8-2-668 - - Headband,
11、Ground Troops-Parachutists Helmet Clip, Spring , Headband Suspension Assembly, Ground Troops-Parachutists Strap, Chin, Ground Troops-Parachutists Helmet Helmet, Ground Troops-Parachutists; Complete Helmet, Ground Troops-Parachutists i All Sizes Helmet, Ground Troops-Parachutists ; Sizes: Extra Small
12、, Small, Medium, Large Helmet, Ground Troops-Parachutists ; A-Nut and Post Helmet , Ground Troop s -Parachut ist s ; Pinwheel Preform Dimensions for Examination of PASGT Helmet Shell Production Lots Helmet ; As sembly As s emb ly (Copies of documents required by contractors in connection with specif
13、ic acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form a part of this document to the extent specified herein. %less otherwise specified, the issues of the documents which are DOD ado
14、pted shall be those-listed in the issue of the DODISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS shall be the issues of the nongovernment documents which are current on the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MAT
15、ERIALS (ASIM) D 2000 - Classification System for Rubber Products in Automotive D 3951 - Standard Practice for Commercial Packaging Applications (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Technical society
16、 and technical association documents are generally available for reference from libraries. technical groups and using Federal agencies.) They are also distributed among 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-q4077A L( W 7977706 03773
17、30 . MIL-H-4 4 O 9 9A 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 shall take precedence. Nothing in this document, however, shall supersede applicable laws and regulations unless a specific exemption
18、 has been obtained. 3. REQUIREMENTS 3.1 Guide samples. Samples, when furnished, are solely for guidance and Variations from this document may information to the contractor (see 6.4). appear in the sample, in which case this document shall govern. 3-2 First article. When specified in the contract or
19、purchase order, a sample shall be subjected to first article inspection (see 4.3, 6.2, and 6.3). 3.3 Materials and components. All materials and components shall be as specified herein or on the applicable drawings (see 6.6). 3.3.1 Cloth, ballistic, aramid. The aramid ballistic cloth for the helmet
20、shell shall conform to type II, class I.of MIL-C-44050. 3.3.1.1 Laminating resin. The resin for coating and laminating the reinforcing material shall be a catalyzed system composed of 50 percent phenol formaldehyde and 50 percent polyvinyl butyral resins (see 6.5). The resin shall be pigmented to ma
21、tch the color of the coating specified in 3.3.4. 3.3.2 Rubber edging. The edging shall be made of a rubber compound matching color Olive Drab 34087 of FED-STD-595 and shall conform to the grade, type, class, and suffix requirements of 3BC61SA14F17Z of ASTM D 2000 and MIL-R-3065. The suffix letter Z
22、indicates the special requirement that the edging when used in conjunction with the specified adhesive in 3.3.3 and procedure specified in 3.4.2 shall meet the adhesion requirements of 3.5.3. The edging design and dimensions shall conform to Drawing 8-2-644. The length shall be sufficient to conform
23、 with the contours of the helmet. As an option, the edging may be a one-piece molded construction. 3.3.3 Adhesive. The adhesive for bonding the rubber edging shall be of a synthetic rubber base type . 3.3.4 Coating. The coating for finishing the helmet shell (see 3.4.3.2) shall conform to MIL-C-4616
24、8, color Olive Drab 34087 of FED-STD-595. 3.3.5 Texturing of coating. Texturing aggregate incorporated in the second coat (see 3.4.3.2) for the exterior of the helmet shall be silica sand or walnut shell flour. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
25、om IHS-,-,-MIL-H-LI4073A 4 7337706 0373333 T m MIL-H-4 409 9A 3.3.5.1 Sand texturing. The aggregate for sand texturing shall be banded silica sand that is water washed and kiln dried, free of salts and deleterious matter, and containing not more than 1.5 percent of dirt or foreign matter. The sand a
26、ggregate shall be that known commercially as No. 70 and shall have a screen analysis as follows: Sieve No. (U.S. STD) Percent cumulative No. 40 NO. 50 NO. 70 NO. 100 NO. 140 0.5 maximum 6.0 st 3 34.0 f 5 82.0 f 5 97.0 + 3, -5 The coating-sand mixture shall contain 6 pounds of sand to one base gallon
27、 of coating and shall be reduced to spraying consisrency. 3.3.5.2 Walnut shell flour texturing. The aggregate for walnut shell flour texturing shall be 40/100 mesh walnut shell flour. flour mixture shall contain 10 to 12 ounces of walnut shell flour per base gallon of coating. The coating-walnut she
28、ll 3.3.6 Suspensian assembly. The suspension assembly shall conform to MIL-S-44097- 3.3.7 Chin strap. The chin strap shall COIIOI-LII to MIL-S-44091. 3.3.8 Headband . The headband shall conform to MIL-H-44098. 3.4 Construction. The construcrion shall conform in all respects to Drawings 2-1-1384 thro
29、ugh 2-1-1386, 2-1-1400, 8-2-644 through 8-2-647, 8-2-661, and 8-2-668, and as specified herein. 3.4.1 Helmet shell. The helmet shell shall be a laminated structure composed of resin coated reinforcing material compression molded by heat and pressure (see 6.5). coated on both sides with equal amounts
30、 of the aminating resin specified in 3.3.1.1 (see 4.4.1.2). The resin content of the coated reinforcing material shall be 15 ta 18 percent solids by weight (volatile free), based on the uncoated reinforcing material weight, and the mix reduced to spraying consistency. A sample of coated material tha
31、t has been subjected to 320F for 5 minutes in a forced air circulating oven is considered as being volatile free. The reinforcing material specified in 3.3.1 shall be 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-H-4 4 O 9 9A 3.4.1.1 Formin
32、g of shell before molding. Forming of the helmet shell shall be accomplished using either pinwheel preform or a combination of pinwheel preforms and rectangular panels. For either method, fastening devices such as staples are not permitted unless they are in the trim area. Application of resin shall
33、 not be permitted in this operation. Spot welding or sewing with thread is permitted, provided that evidence of these methods is not visible on the outside surface of the finished helmet. 3.4.1.1.1 Pinwheel preform construction. The pinwheel preforms shall be similar in configuration to that shown o
34、n Drawing 8-2-661 but may vary in size. To facilitate forming of the preform, the pinwheels may be cut up to within 2 1/2 inches of the center of the pinwheel, leaving an uncut area miasuring 5 inches minimum across in any direction. legs, of approximate equal dimensions, on each pinwheel. A maximum
35、 of two pinwheels, other than the innermost or outermost preform layer, may be formed by using two half pinwheels joined together with a minimum 3 inch by 5 inch rectangle of the same material used for the pinwheels. The 5 inch dimension shall be centered and parallel to the butted joint of the two
36、half pinwheels. These segmented pinwheel layers may be located anywhere within the preform lay-up. The pinwheel preforms shall be assembled with three crown plies similar to Drawing 8-2-661 so that there are not less than 19 layers of fabric throughout any cross-sectional area of the shell. The pinw
37、heel preforms shall be superimposed over each other such that the gaps of each layer are offset from the gaps of all other layers. The 19 layers of fabric required throughout may be obtained by the use of 16 pinwheel preforms when they are properly formed and superimposed on each other. Gaps in the
38、pinwheel preforms shall not exceed 3/32 inch in width. There shall be no pleat, wrinkle, or crease greater than 1/2 inch width. Any pleat, wrinkle, or crease 1/2 inch or less in length shall be smooth. The pinwheels shall each be one continuou;, integral piece of fabric. There shall be no more than
39、eight 3.4.1.1.2 Combination pinwheel preform and rectangular panel construction. construction shall consist of a single outer and a single inner fabric layer of pinwheel construction, conforming to the same requirements as specified in 3.4.1.1.1, with rectangular panels sandwiched between. The panel
40、s shall be rectangular in shape, cut in the warp and filling direction, and the size may vary providing that no dimension is less than 3 inches. In addition to rectangular panels, the crown may contain circular or oval shaped plies providing that the radius to any point on the periphery is not less
41、than 2 1/2 inches. other such that the gaps of any two adjacent layers are offset by a minimum of 1/2 inch. 19 layers of fabric, including the inner and outer pinwheel layers, throughout The combination pinwheel preform and rectangular panel The individual preform layers shall be superimposed over e
42、ach The panels shall be laid up so that there are not less than 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-4 409 9A any cross-sectional area of the shell. There shal be no pleat, wrinkle, or crease greater than 1/2 inch in length. 1/2 in
43、ch or less in length shall be smooth. Any pleat, wrinkle, or crease 3.4.1.1.3 Approval of helmet shell preform. Prior to beginning production under any contract, the following shall be submitted to the contracting activity for examination for compliance with the specified requirements : a. preform a
44、ssembly for each size helmet. One complete set of individual pieces to be used to form one b. One completely assembled preform for each size helmet for which the pieces were furnished in 3.4.1.1.3.a. C. One molded helmet for each completely assembled preform. . d. One completely finished helmet shel
45、l of each size being procured. Approval by the Government of the individual pieces and the preform assembly required above will authorize the contractor to use his preforming method in- production (see 6.2). Approval of the preforming method does not relieve the contractor from meeting any of the re
46、quirements specified herein. Any changes to the preforming method shall require reapproval. 3.4.1.2 Molding of shell. The shell shall be formed during a single molding cycle that is defined as the time between the closing and opening of the mold one time only (breathing, degassing, or pinching off i
47、s not considered opening or closing the mold in this context). The shell shall not be remolded after this single molding cycle. The outer and inner surfaces of the molded shell shall be smooth, and the edge shall be finished smooth and even with no exposed ends of the fabric fibers showing. Both the
48、 inside and outside surfaces shall be free from any hole, void, delamination, blister, cracking, dry spot, area of non-resin flow, and also any pit greater than 1/8 inch in diameter and the depth of one ply. Permissible gaps and pits shall be filled with epoxy resin to provide a smooth and continuou
49、s surface. There shall be no pleat, wrinkle, or crease on the inside or outside of the helmet shell, except as allowed in 3.4.1.1.1 or 3.4.1.1.2. Before further processing is undertaken, the contractor is responsible for 100 percent inspection immediately after the molding cycle for delamination and bisters (see 4.4.2.2). Delamination and blisters, as well as evidence of delaminations and blisters, are not acceptable; neither is any
