1、Comments, suggestions, or questions on this document should be addressed to U.S. Army Tank-automotive and Armaments Command, ATTN: AMSRD-TAR-E/CM/DM/STND, MS# 268 Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact information can change, you may want to verify the
2、currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 9330 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. INCH-POUND MIL-DTL-62474F w/AMENDMENT 1 21 May 2008 SUPERSEDING MIL-DTL-62474F 29 November 2007 DETA
3、IL SPECIFICATION LAMINATE: ARAMID-FABRIC-REINFORCED, PLASTIC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers an aramid fabric-reinforced plastic laminate for use in composite armor systems. 1.2 Classif
4、ication. Laminates will be of the type and class specified (see 6.2): Type 1 - Flat. Type 2 - Molded. Class A - Yarn used, nominal 1500 Denier, minimal 975 filaments. Basket weave Class B - Yarn used, nominal 3000 Denier, minimal 1300 filaments. Basket weave Class C - Yarn used, nominal 3000 Denier,
5、 minimal 1300 filaments. Plain weave Class D* - Yarn used, nominal 3000 Denier, minimal 1300 filaments. Plain weave *(low resin content variant) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62474F w/AMENDMENT 1 1.3 Part or identifying numb
6、er (PIN). The PIN to be used for laminate acquired to this document is created as follows: M 62474 - X X Class (see 1.2) A - Class A B - Class B C - Class C D - Class D Type (see 1.2) 1 - Type I 2 - Type II Specification number Prefix for military specification. 2. APPLICABLE DOCUMENTS 2.1 General.
7、The documents listed in this section are specified in sections 3, 4 or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness
8、of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4 or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards,
9、 and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-662 - V50 Ballistic Test for Armor. MIL-STD-810 - Environmental Test Methods
10、and Engineering Guidelines. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted
11、 without license from IHS-,-,-MIL-DTL-62474F w/AMENDMENT 1 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATION
12、AL ASTM D123 - Standard Terminology Relating to Textiles (DoD Adopted) ASTM D629 - Standard Test Methods for Quantitative Analysis of Textiles (DoD Adopted) ASTM D2563 - Standard Practice for Classifying Visual Defects in Glass-Reinforced Plastic Laminate Parts (DoD Adopted). ASTM D3775 - Standard T
13、est Method for Warp (End) and Filling (Pick) Count of Woven Fabrics (DoD Adopted). ASTM D3776 - Standard Test Method for Mass Per Unit Area (Weight) of Fabric (DoD Adopted). (Copies of the above documents are available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959
14、or through their website at http:/www.astm.org) SAE INTERNATIONAL AMS 3902 - Cloth, Organic Fiber (Para-Aramid), High Modulus for Structural Composites (DoD Adopted). (Copies of the above documents are available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096 or through their we
15、bsite at http:/www.sae.org) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, 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, supersedes applicable la
16、ws and regulations 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 in accordance with 4.2. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
17、HS-,-,-MIL-DTL-62474F w/AMENDMENT 1 3.2 Materials. Materials used shall be in accordance with the manufacturers materials specifications for aramid fabrics. The materials shall be capable of meeting all the operational and environmental requirements specified herein (see 4.4). 3.2.1 Aramid fabrics.
18、3.2.1.1 Class A laminates. The aramid fabric reinforcement used in class A laminates shall be woven from an aramid yarn of nominal 1500 denier, minimal 975 filaments, 1 percent finish. All yarn shall be of the same production lot as defined in ASTM D123. The fabric construction shall be 42 +2 ends p
19、er 25.4 mm by 42 +2 picks per 25.4 mm in a 7 x 7 basket weave as determined by ASTM D3775. Yarns shall have zero twist (see 4.4). 3.2.1.2 Class B laminates. The aramid fabric reinforcement used in class B laminates shall be woven from an aramid yarn of nominal 3000 denier, minimal 1300 filaments, 1
20、percent finish. All yarn shall be of the same production lot as defined in ASTM D123. The fabric construction shall be 21 +1 ends per 25.4 mm by 21 +1 picks per 25.4 mm in a 4 x 4 or 2 x 2 basket weave as determined by ASTM D3775. Yarns shall have zero twist (see 4.4). 3.2.1.3 Class A and class B. T
21、he aramid fabrics described in 3.2.1.1 and 3.2.1.2, shall have a moisture-free weight of 16.25 +0.75 ounces per square yard (oz/yd2) 551 +25 grams per square meter (g/m2) as determined by ASTM D3776 (option C) after drying in accordance with Section 9 of ASTM D629. The sample shall be dried until th
22、e loss in mass is minimal or when a constant mass has been reached. This constant mass shall be considered the moisture-free weight. If sizing is used in the weaving process, it shall be a water soluble polyvinyl alcohol. If sizing is used, the fabric shall be cleaned (scoured) to a maximum content
23、of 0.5 weight percent of the moisture-free fabric weight. The maximum moisture content of the aramid fabric after weaving or weaving and scouring shall be five (5) percent by weight as determined by ASTM D629, Section 9. Fabric quality shall conform to paragraph 3.3 of AMS 3902. Selvages shall be wo
24、ven or three-end leno. Tension in warp and fill shall be adequate to assure uniform fabric construction after resin coating/impregnation (see 4.4). 3.2.1.4 Class C and class D laminates. The aramid fabric reinforcement used in class C and D laminates shall be woven from an aramid yarn of nominal 300
25、0 denier, minimal 1300 filaments, 1 percent finish. All yarn shall be of the same production lot as defined in ASTM D123. The fabric construction shall be 17 +1 ends per 25.4 mm by 17 +1 picks per 25.4 mm in a plain weave as determined by ASTM D3775. Yarns shall have zero twist (see 4.4). 3.2.1.5 Cl
26、ass C and class D. The aramid fabric described in 3.2.1.4, shall have a moisture-free weight of 13.5 +/- 1.0 ounces per square yard (oz/yd2) 450 +/- 30 grams per square meter (g/m2) as determined by ASTM D3776 (option C) after drying in accordance with Section 9 of ASTM D629. The sample shall be dri
27、ed until the loss in mass is minimal or when a constant mass has been reached. This constant mass shall be considered the moisture-free weight. If sizing is used in the weaving process, it shall be a water soluble polyvinyl alcohol. If 4 Provided by IHSNot for ResaleNo reproduction or networking per
28、mitted without license from IHS-,-,-MIL-DTL-62474F w/AMENDMENT 1 sizing is used, the fabric shall be cleaned (scoured) to a maximum content of 0.5 weight percent of the moisture-free fabric weight. The maximum moisture content of the aramid fabric after weaving or weaving and scouring shall be five
29、(5) percent by weight as determined by ASTM D629, Section 9. Fabric quality shall conform to paragraph 3.3 of AMS 3902. Selvages shall be woven or three-end leno. Tension in warp and fill shall be adequate to assure uniform fabric construction after resin coating/impregnation (see 4.4). 3.2.2 Lamina
30、ting resin. The resin for coating and laminating the aramid fabric laminate shall be a catalyzed system composed of a mixture of phenol formaldehyde and polyvinyl butyral resins. Resin coating of the fabric shall be uniform and accomplished by continuous preimpregnation of the fabric. Moisture conte
31、nt of the aramid fabric shall be determined in accordance with Section 9 of ASTM D629. The sample shall be dried until the loss in mass is reduced to less than two (2) percent prior to resin coating. Resin content of class A, B and C aramid laminate after coating shall be 18 to 22 weight percent sol
32、ids (volatile free) based on the weight of aramid fabric as determined by ASTM D3776 (option C) with moisture content reduced to less than 2 percent. Resin content of the class D aramid laminate after coating shall be 12 to 18 weight percent solids (volatile free) based on the weight of aramid fabri
33、c as determined by ASTM D3776 (option C) with moisture content reduced to less than 2 percent. NOTE: A sample of resin coated fabric that has been placed in a forced air circulating oven at 330 +10 degrees Fahrenheit (F) 154 +6 degrees Celsius (C) for 60 minutes is considered to be volatile free (se
34、e 4.4). 3.2.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically
35、advantageous life cycle costs. 5 3.3 Construction (fabrication). 3.3.1 Dimensions and structure. The plastic laminates shall be of the dimensions stated in the acquisition documents (see 6.2). The class A and B laminates shall consist of the specified number of plies of resin-coated aramid fabric re
36、inforcement bonded together in a single molding step with heat and pressure. The laminates shall be built up from individual plies of fabric with no fabric gap or selvage in any individual ply (see 4.3.3 and 4.4). Class C and D laminates shall consist of whatever number of plies required for the spe
37、cified areal density of the finished laminate. 3.3.1.1 Thickness and flatness variation. The thickness at any point more than one in. from an edge shall not vary from the nominal thickness of the panel by more than +0.015 in. (0.38 mm) for type I and +0.030 in. (0.76 mm) for type II. Variation from
38、flatness for each finished panel shall not exceed 0.06 inch per foot (in/ft) (5.00 millimeters per meter (mm/m) (See 4.3.3 and 4.4). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62474F w/AMENDMENT 1 6 3.3.1.2 Weights. The unit weight or ar
39、eal density of the finished class A or class B laminates shall fall within the ranges established by table I (see 4.3.4.1). TABLE I. Finished laminate unit weights for Class A and Class B. 1/ Plies wt (lb/ft2) Plies wt (lb/ft2) Plies wt (lb/ft2) Plies wt (lb/ft2) 1 0.127-0.152 11 1.40-1.67 21 2.67-3
40、.18 31 3.95-4.69 2 0.255-0.303 12 1.53-1.82 22 2.80-3.33 32 4.08-4.85 3 0.382-0.454 13 1.65-1.97 23 2.93-3.48 33 4.20-5.00 4 0.510-0.606 14 1.78-2.12 24 3.06-3.64 34 4.33-5.15 5 0.637-0.757 15 1.91-2.27 25 3.18-3.79 35 4.46-5.30 6 0.765-0.908 16 2.04-2.42 26 3.31-3.94 36 4.59-5.45 7 0.892-1.06 17 2.
41、16-2.58 27 3.44-4.09 37 4.71-5.60 8 1.02-1.21 18 2.29-2.73 28 3.57-4.24 38 4.84-5.75 9 1.14-1.37 19 2.42-2.88 29 3.69-4.39 39 4.97-5.91 10 1.27-1.57 20 2.55-3.03 30 3.82-4.54 40 5.10-6.06 1/ pounds per square foot (lb/ft2) TABLE Ia. Finished laminate unit weights for Class A and Class B. 1/ Plies wt
42、 (kg/m2) Plies wt (kg/m2) Plies wt (kg/m2) Plies wt (kg/m2) 1 0.62-0.74 11 6.84-8.15 21 13.04-15.53 31 19.29-22.90 2 1.25-1.48 12 7.47-8.89 22 13.67-16.26 32 19.92-23.68 3 1.87-2.22 13 8.06-9.62 23 14.31-16.99 33 20.51-24.41 4 2.49-2.96 14 8.69-10.35 24 14.94-17.77 34 21.14-25.15 5 3.11-3.70 15 9.33
43、-11.08 25 15.53-18.51 35 21.78-25.88 6 3.74-4.43 16 9.96-11.82 26 16.16-19.24 36 22.41-26.61 7 4.36-5.18 17 10.55-12.60 27 16.80-19.97 37 23.00-27.34 8 4.98-5.91 28 11.18-13.33 28 17.43-20.70 38 23.63-28.08 9 5.57-6.69 19 11.82-14.06 29 18.02-21.44 39 24.27-28.86 10 6.20-7.42 20 12.45-14.80 30 18.65
44、-22.17 40 24.90-29.59 1/ kilograms per square meter (kg/m2) 3.3.2 Lamination pressures and temperatures. The following conditions shall prevail during lamination processes (see 4.3.3): a. Type I and II. 1. Type I (flat) laminates shall be press-molded at 250 +10 pounds per square inch (psi) 1725 +69
45、 kilopascals (kPa). 2. Type II (molded) laminates shall be press-molded at 200 +10 psi (1380 +69 kPa) or may be autoclaved at 50 psi (345 kPa) minimum. Pressures indicated above shall be maintained until the following stages have been completed. b. Type I and II (except autoclave). Provided by IHSNo
46、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62474F w/AMENDMENT 1 7 1. Press platen temperature increased to 330 +10F (166 +6C). 2. Dwell in accordance with schedule of Table II (Class A and B) with platens at 330 +10F (166 +6C). Use Table IIa for dwell ti
47、me based upon areal densities (AD) of the ply layup for class C and D laminates. 3. Press platen temperature reduced to a maximum of 180F (82C) before laminate removal. c. Type II (autoclave) 1. Autoclave temperature increased to 330 +10F (166 +6C). 2. Dwell in accordance with Table II (Class A and
48、B) with autoclave at 330 +10F (166 +6C). Use Table IIa for dwell time based upon areal densities (AD) of the ply layup for class C and D laminates. 3. Autoclave temperature reduced to a maximum of 180F (82C) before laminate removal. TABLE II. Laminating dwell times for Class A and B. Laminate plies
49、(number) Dwell time (minutes) 1-10 30 11-20 45 21-30 75 31-40 TABLE IIa. Laminating dwell times for Class C and D. Laminate AD (psf) Dwell time (minutes) 4.5 75 3.3.3 Finished laminate. The finished laminates shall consist of the specified number of plies (A and B) or areal density (C and D) sandwiched between single peel-plies which can be incorporated in the lamination process. Peel-pli
