1、MIL-B-44421 84 m 79777Ob 0472338 b m MIL-B-44421 (GL) 21 Februarv 1991 MILITARY SPECIFICATION This specification is approved for use by the Natick Research, Developriient, and Engineering Center, Department of the Amy, and is available for use by all Departments and Agencies of the Department of Def
2、ense. 1. SCOPE 1.1 Scope. This specification covers a ceramic body armor insert to be worn by aircrew personnel. worn is intended to provide protection from small arms fire. is part of an aicrew survival system. Clothing and Equipnt (ISC distribution is unlimited. Licensed by Information Handling Se
3、rvicesMIL-B-44421 84 999990b 0472339 8 H MIL-B-44421 (a) are those listed in the issue of the Department of Defense Index of Specifications and Standank (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DDD-L-20 - Label: For Clothing, Equipage and Tentage, PPP-3-63
4、6 - Boxes, Shipping, Fiberboard (General Use) MILITARY MIL-C-12369 - Cloth, Ballistic, Nylon MIL-L-35078 - mds Unit: Preparation of Semiperishable Subsistence Items; Clothing, Personal Equipnt and Equipage; General Specification For STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for
5、 Inspection by MIL-STD-129 - Marking for Shipnent and Storage MIL-STD-147 - Palletized Unit Imds MIL-STD-453 - Inspection, Radiographic MIL-STD-970 - Standards and Specifications, order of Prsedence Attributes For the Selection of (Unless otherwise indicated, copies of federal and military specifica
6、tions, standards, and handbooks are available from the StanMzation Documents Oder Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.1.2 other Government documents, drawinqs and publications. The following other Govenunent documents, drawings and publications form a pwt of this d
7、oCumeait to the extent specified herein. the issues are those cited in the solicitation. Unless otherwise specified, DRAWINGS U.S. ARMY NATICK RES-, DEVELXPMENT, AND ENGINEERING CEMLER 8-2-893 - Ebdy Armor, Survival, Small Arms Protective, Aircrewman, Short Bocty Amior, Survival, -11 Arms Protective
8、, Aircrewman, Medium - 8-2-894 2 Licensed by Information Handling ServicesMIL-E-44421 4 = 9999906 0472320 4 8-2-895 - Bocty Annor, Survival, Srna11 Arms protective, Aircrewman, Long 8-2-896 - EWiy Armor, Survival, Small Anris Protective, AirCr-, X-Long (Copies of drawings are available fram the U.S.
9、 Amy Natick Research, Developnt, and Engineering Center, Am: 01760-5017.) STRNC-UX, Natick, MA 2.2 Non-Government publications. The following documents form a part of Unless otherwise specified, this document to the extent specified herein. Unless otherwise specified, the issues of the documents whi
10、ch are DOD adopted are those listed in the issue of the DDISS cited in the solicitation. the issues of d0c;uments not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESIING AND MATERIALS (ASTM) D 792 - Specific Gravity and Density of Pl
11、astics by D 2584 - Ignition Loss of Cured Reinforced Resins D 2863 - Measuring the Minimum Oxygen Concentration to Displacement Support Candle-Like Combustion of Plastics (Oxygen Index) D 3951 - Standard Practice for Comnerical Packaging (Application for copies should be addressed to the American So
12、ciety for (Non-Government standards and other publications are nomlly available Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) from organizations that prepare or distribute the doc=uments. also my be available in or through libraries or other informational services. ) These d
13、0c;uments 2.3 Mer of precedence. In the event of a conflict between the text of Nothing in this doc;wient, however, supersedes applicable this document and the references cited herein, the text of this documnt takes precedence. laws and regulations unless a specific exemption has been obtained. 3. R
14、EQuIREMnvIis 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accorbance with 4.3. 3.2 Guide samples. Guide samples, when furnished, are solely for guidance and information to the contractor (see 6.11). cation my appear in the sample,
15、in which case this specification shall govern. Variations from this specifi- 3 Licensed by Information Handling ServicesMIL-B-44421 84 9979906 0472323 b 3.3 Materials and components. The materials and components shall be as Materials and cmponents specified herein and on the applicable drawings. not
16、 specified shall be selected by the contractor in accordance with MIL-SID-970. MIL-STD-970 shall not degrade the operational suitability or effectiveness of the bdy arnmr. It is encouraged that recycled material be used when practical as long as it meets the requirements of this specification. Mater
17、ials and components specified in accordance with 3.3.1 Ceramic. The material for the ceramic plate shall be silicon carbide. 3.3.1.1 Formulation and processinq. The ceramic plate shall be homogenous and of one piece (monolithic) construction. manufactured in distinct production lots (see 4.4.1) and
18、a sequential marking system of individual components shall be provided (see 3.6.1). contractor shall not change the ceramic formulation or processing technique without approval of the contracting officer (see 4.4.2.1). Information shall also be furnished as to what production lots are affected by th
19、e change in ceramic formulation or processing technique. formulation or processing technique shall constitute a new lot. All ceramic plates shall be The A change in the ceramic 3.3.2 Fiberqlass laminate. The fiberglass laminate shall consist of a minimum of 20 percent by weight of unsaturated polyes
20、ter type, unfilled resin and my contain modifying monmrs or plpers and the remainder shall be undyed fiberglass fabric. 4.4.2.2. than 20 when tested as specified in 4.4.2.2. be constructed as specified in the appropriate drawing. Resin content shall be determined as specified in The fiberglass lamin
21、ate shall have an oxygen index value not less The fiberglass laminate shall 3.3.3 Cloth, nylon. The nylon cloth for the spall cover and spall cover The color shall be natural. edging shall conform to class 1 of MIL-C-12369. 3.3.4 Foam pad. The foam pad shall be vinyUnitrile, 3/4 inch thick in accord
22、ance with Uniroyal Inc., Ensolite, type AU3 (see 6.9) or Rubatex, R-310-V, R-338-V (see 6.9) or equal (see 6.10). 3.3.5 Adhesives. 3.3.5.1 For bondinq ceramic plate to fibemlass laminate (optionall. The adhesive for bonding the ceramic component to the fiberglass laminate compo- nent shall be solven
23、tless liquid or film epoxy type, two-part polysulfide type, or two-part polyurethane type and shall be capable of passing the requirement in 3.5.2 (see 4.4.2.1). fiberglass laminate component may be performed without adhesive using certain molding techniques. Bonding of the ceramic component to the
24、4 Licensed by Information Handling ServicesMIL-B-44421 84 9999906 0472322 8 MIL-B-44421( incorrect; illegible; of improper size, location, sequence, or methcd of application Materials Any component missing, damaged, or not as specified Worlananship Inadequate application of components, such as: Bulg
25、ed or distorted container inccxnplete sealing or closure of flap, improper taping, loose strapping, or inadequate stapling Contents Number per container is more or less than required 4.4.8 Palletization examination. The -fully packaged and palletized end items shall be examined for the defects liste
26、d below. The lot size shall be expressed in units of palletized unit loads. The sample unit shall be one palletized unit load, fully packaged. The inspection level shall be S-1 and the AQL, expressed in terms of defects per hundred units, shall be 6.5. 19 Licensed by Information Handling ServicesMIL
27、-8-44421 4 9999906 0472337 T Examine Defect Finished dimensions Length, width, or height exceeds specified maximum requirement Palletization Pallet pattern not as specified Lmd not bond incorrect; illegible; of improper size, location, sequence, or method of application 4.5 Methods of inspection. 4.
28、5.1 Ballistic test. The ballistic test shall be conducted in accordance with Appendix A unless otherwise specified. reported for each ceramic/fiberglass laminate. 4.5.2 IWIKE rature extremes test. The ceramic/fiberglass laminate, less the spa11 cover, edging and foam pad shall k heated in an oven op
29、erating at 16O0 _+ 5% for 6 2 1/4 hours. The test specimen shall then be allowd to cool to room temperature followed by cold exposure at -65O _+ 59 for 6 _+ 1/4 hours. to 90%) and shall then be examined at edges for evidence of delamination of the fiberglass laminate component frm the ceramic plate
30、or any delamination of the fiberglass plies. my be returned to the production lot. being pulled in four separate areas (away from the armor plate insert) by hand without tearing the foam. frm an armor plate which has been tested ballistically using an undamaged area, or a small test specimen made id
31、entically to the armor plate with respect to surface preparation, adhesive application, and bonding. parallel cuts through the spall covering 4 inches long and 1 inch apart along the weave. At one end of the cut, make a cut at a right angle so that a 1 inch wide by 2 inch long tab can be peeled from
32、 the armor plate. pound weight to this tab so that the resultant peel force is nom1 to the plane of the armor plate. Make gage marks on the specimen for the measurment of the amount of peeling during the test. hours minimum at room temperature (70 to 909). the tab exceeding 1/16 inch constitutes fai
33、lure of the test. Adhesion test for spall cover edqinq. will be the same as specified in 4.5.4, however the test will be performed on the edge of the plate parallel to the long axis. The areal density shall be The specirnen shall be allowed to warm to room temperature (70 pecimens that have passed t
34、he test The foam pad shall not be capable of 4.5.3 Adhesion test for foam pad. 4.5.4 Adhesion test for spall cover. The sample for this test my be made Make Attach a 2 Allm the weight to hang for 4 Any visual peeling of 4.5.4.1 The sample for this test Make parallel cuts through 20 Licensed by Infor
35、mation Handling ServicesAreal density (lb/sq. ft.) = 5.202 X Density (g/cc) X Thickness (in.) 5. PACKAGING 5.1 Preservation. Presemation shall be level A. 5.1.1 Level A preservation. Each bdy mr insert shall be completely wrap in cushioning to prevent damage. 5.2 Packinq. Packing shall be level A, B
36、 or Ccirtnercial, as specified (see 6.2). specified in 5.1, shall be packed in a shipping container conformingto style Rsc-L, grade V2s of PPP-B-636. 5.2.1 Level A mckinq. mo inserts of one size only, preserved as Inside dimensions of the shipping container 21 MIL-B-44421 84 9999906 0472338 1 the sp
37、a11 cover edging edge covering 4 inches long and 3/4 inch apart along .le weave. At one end of the cut, make a cut at a right angle so that a 3/4 inch wide by 2 inch long tab can be peeled frcnn the plate. Attach a 2-pound weight to this tab so the resultant peel force is normal to the plane of the
38、edge of the armor plate. of the amount of peeling during the test. hours minimum at room temperature (70 to 90%). the tab exceeding 1/16 inch constitutes failure of the test. Make gage marks on the specimen for the measurement Allaw the weight to hang for 4 Any visual peeling of 4.5.5 Areal density.
39、 The areal density in pounds per square foot of the ceramidfiberglass laminate, without spall cover and edging, shall be calculated from measurements on the ceramic/fiberglass laminate. The ceramic/fiberglass laminate shall be weighed to the nearest 0.01 pound. thickness shall be measured to 0.001 i
40、nch at four corner locations on the laminate. Six measurements shall be made at each corner with the first measurement taken approximately 1 inch from the edge of the corner and the remaining five taken on a straight line taward the center of the armor with the measurements spaced at approximately 1
41、 inch increments. measurements shall be taken at the law points of the fabric weave and three at the high points. Products Corp. Model KP 125 or KP 129, or equal (see 6.10), with stxndard tips, shall be used for taking measurenents. shall be used in the calculation of the areal density. minations sh
42、all be reported. painted with a slaw drying lacquer or resin to seal the edges. shall be allawed to dry (at least 1/2 hour) before proceeding with the determination of density, determined by Method A of ASTM D 792, except that the imnerSed weight shall be determined to 0.01 pound and the liquid used
43、 shall be clean tap water, containing a wetting agent if necessary, which shall be changed just prior to examination of each lot, cover and edging shall be calculated to the nearest O.l/lb/sq. ft. as follows : The Three A deep throat type depth gage conformingto Federal The average of the 24 reading
44、s Ail thichess deter- The edges of the glass fiber laminate shall be The lacquer The average density of the armor plate shall be The areal density of the armor plate without spall Licensed by Information Handling ServicesMIL-B-44421 4 9999906 0472339 3 MIL-B-4442 1 (CL) for sizes short and medium sh
45、all approximate 14-1/2 inches in length, 12-1/2 inches in width, and 8 inches in depth. container for sizes long and X-long shall be approximate 15-1/4 inches in length, 14-1/2 inches in width, and 8-1/2 inches in depth. Each shipping container shall be closed, waterproofed, and reinforced in accord
46、ance with the appendix of PPP-B-636. Shipping containers shall be arranged in unit loads in accordance with MIL-L-35078 for the type and class of load specified (see 6.2). type II, class F loads. Inside dimensions of the shipping Strapping shall be limited to nonmetallic strapping, except for 5.2.2
47、Level B packinq. llm inserts of one size only, preserved as specified in 5.1, shall be pcked in a shipping container conforming to style RSC-L, type CF (variety SW) or SF, class domestic, grade 275 of PPP-B-636. Inside dimensions of the shipping container for short and medium shall approximate 14-1/
48、2 inches in length, 12-1/2 inches in width, and 8 inches in depth. shall approximate 15-1/4 inches in length, 14-1/2 inches in width, and 8-1/2 inches in depth. Each shipping container shall be closed in accordance with method II as specified in the appendix of PPP-B-636. Inside dimensions of the sh
49、ipping container for sizes long and X-long 5.2.2.1 Weather-resistant shippinq container. When specified (see 6.2), the shipping container shall be a grade VC, VS, or V4s fiberboard box fabricated in accordance with PPP-B-636 and closed in accordance with the appendix of PPP-B-636. 5.2.3 Comnercial packing. Inserts, preserved as specified in 5.1, shall 5.3 Palletization. When spcified (see 6.2), inserts pcked as specified be pcked in accordance with AS?M D 3951. in 5.2.2 or 5.2.3 shall be palletized on a 4-way entry pallet in accordance with load type Ia of MIL-SID-147. Palle
