1、MIL-H-24725 4 7777706 0384637 7 MIL-H-24925 14 September 1987 MILITARY SPECIFICATION HOOD, FIREMANS ALUMINIZED, PROXIMITY, WITH LIFT-UP VISOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the require
2、ments for a heat protective hood constructed from a para-aramid knit outer fabric having a highly reflective aluminized face with a protective lift-up visor. I .z 1.2 Classification. The hood covered by this specification shall be of one type and size only. 2. APPLICABLE DOCUMENTS 2.1 Government doc
3、uments. 2.1.1 Specifications, standards, and handbooks . The following specifications, standards, and handbooks f om 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
4、Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. 0 Beneficial comments (recommendations, additions, deletions) and any pertinent . data which may be of use in improving this document should be addressed to: OFFICER IN CHARGE, Navy Clothing and Textile
5、 Research Facility, 21 Strathmore Road, Natick, MA 01760-2490 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 8415 DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimite
6、d. THIS DOCUMENT CONTAINS Yg. PAGES. -, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_-. MIL-H-2Ll925 84 7779906 0384b20 3 MIL-H-24925 SPECIFICATIONS FEDERAL L-P-3 7 7 L-P-378 FF-W-92 NN-P-7 1 RR-P -0056 O ccc-c-440 DDD-L-20 GGG-H-142 PPP-B-26 PPP
7、-B-636 PPP-T-45 MIL I TARY MIL-W-530 MIL-W-5664 MIL-F-10884 MIL-P-150 11 MIL-C-19 699 MIL-F-21840 MIL-C-24929 MIL-T-43548 MIL-T-43636 MIL-C-437 74 MIL-T-44100 MIL-A-46 1 O 6 MIL-P-46144 MIL-B-8 700 2 - Plastic Sheet and Strip, Polyester - Plastic Sheet and Strip, Thin Gauge, Polyolefin - Washer, Fla
8、t - Pallet, Material Handling, Wood, Stringer - Post, Ledger and Binder, Screw Type - Cloth, Cheesecloth, Cotton, Bleached and Unbleached - Label; For Clothing, Equipage, and Tentage (General - Helmet; Construction Workers - Bag, Plastic (General Purpose) - Box, Shipping Fiberboard - Tape, Gummed, P
9、aper, Reinforced and Plain for Construction, 2 Way and 4 Way (Partial) Use) Sealing and Securing - Webbing, Textile, Cotton, General Purpose, Natural - Webbing, Textile, Elastic Cotton - Fasteners, Snap - Pallet, Material Handling, Wood Post Construction, - Cloth, Coatd (Nylon Taffeta) - Fastener Ta
10、pes, Hook and Pile, Synthetic - Cloth, Laminated, Aluminized - Thread, Polyester, Cotton Covered and Rayon Covered - Thread, Aramid - Cloth, Plain or Pajama Check Weave, Aramid - Thread, Para-Aramid, Spun, Intermediate Modulus - Adhesive-Sealants , Silicone, RTV, General-Purpose - Plastic Sheet, Pol
11、ycarbonate - Batting, Synthetic Fibers, Quilted Aramid or in Colors 4-Way Entry (For Eletrical and Mechanical Sealing) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-249 25 O STANDARDS FEDERAL MIL-STD-105 FED-STD-19 1 FED-STD-751 MILITARY MI
12、L-STD-129 MIL-STD-147 MIL-STD-1666 - Sampling Procedures and Tables for Inspection by - Textile Test Methods - Stitches, Seams, and Stitchings At tribut es - Marking for Shipment and Storage - Palletized Unit Loads - Classification of Defects for Evaluation of Quality of Al mini zed Fi remen s Clot
13、hing MS 9358 - Nut, Castellated, Hexagon-A 286, MIL-S-8879 MS-24679 - Nut, Plain Cap, Low Crown Unc-2b, and Unf-2b MS-2 79 80 - Fasteners, Snap, Style 2 (Regular Wire Spring Clamp MS 35207 - Screw, Machine-pan Head, Cross Recessed, Carbon Steel , Cadimum Plated, Unf-2a MS-51957 - Screw Machine Pan H
14、ead, Cross Recessed Corrosion Resisting Steel, Passivated, Une-La Type) DRAWINGS NAVY CLOTHING AND TEXTILE RESEARCH FACILITY 16-1-836 16-1-837 16-1 -838 16-1-839 16-1-840 16-1-841 16-1-842 16-1 -843 1 6- 1 -844 16- 1-845 16-1-846 16-1 -84 7 - Hood Firefighters with Lift Up Visor - Frame, Outer - Fra
15、me, Inner - Visor - Frame, Side Visor Left - Frame, Side Visor Right - Face Shield Gold Coated Mylar - Block, Helmet - Block, Pivot Visor - .Strike - Latch Assembly - Chin Strap Assembly (Copies of specif-ations , standards, drawings, and pu,licat,ms requ-rec contractors in connection with specific
16、procurement functions should by be obtained from the procuring activity or as directed by the contracting officer . ) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ _ _-_ MIL-H-24725 84 7777706 O384622 7 W MIL-H-24925 2.1.2 Other Government docu
17、ments, drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to the extent specified herein. LAWS AND REGULATIONS U.S. POSTAL SERVICE MANUAL (Copies of the manual may be obtained from the Superintendent of Documents, U.S. G
18、overnment Printing Office, Washington, DC 20402.) 2.2 Other publications. The following document(s) form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted shall be those listed in the issue of the DODISS specifi
19、ed in the solici tation. Unless otherwise specified, the issues of documents not listed in the DODISS shallbe the issue of the nongovernment documents which is current on the date of the solicitation. NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC., AGENT National Motor Freight Classification (Appl
20、ication for copies should be addressed to the American Trucking Association, ATTN: Traffic Department, 1616 P Street, N.W., Washington, DC 20036). UNIFORM CLASSIFICATION COMMITTEE, AGENT Uniform Freight Classification (Application for copies should be addressed to the Uniform Classification Committe
21、e, Room 1106, 222 South Riverside Plaza, Chicago, Illinois 60606). JOINT COMMITTEE ON PRINTING (JCP) PUBLICATIONS Government Paper Specification Standards (Application for copies should be addressed to the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.) AMERICAN
22、SOCIETY FOR TESTING MATERIALS ASTM-D-1003-61 - Haze and Luminous Transmittance of Transparent Plastic, Test for (Application for copies should be addressed to the American Society for Testing Materials, 1916 Race Street, Philadelphia, PA 19103.) 4 U Provided by IHSNot for ResaleNo reproduction or ne
23、tworking permitted without license from IHS-,-,-MIL-H-2q925 4 9 9999906 034h23 4 I MIL-H-2 4925 i l i l ! i ! I l I t I i l I k i I t I I I a . .r O CODES FOR COMMERCIAL AND GOVERNMENT ENTITIES (CAGE) Cataloging Handbook H4-1 (Name to Code) and H4-2 (Code to Name) (Application for copies should be a
24、ddressed to Defense Logistics Service Center, Federal Center, Battle Creek, MI 49017) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. Nothing in this specification howeve
25、r, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Guide sample. Samples, when furnished, are solely for guidance and information to the contractor (see 6.3). Variations from this specification may appear in the sample in which case
26、this specification shall govern. 3.2 First article. When specified, the contractor shall furnish sample unit(s) for first article inspection and approval (see 4.3 and 6.2). 3.3 Material. 3.3.1 Basic material. The material for the outer shell of the hood shall be a knit para-aramid fabric laminated w
27、ith a vacuum deposited aluminium on a .25 mil. polyester film on the face conforming to MIL-C-24929. 3.3.2 Quilted lining. The material for the quilted lining shall be aramid quilted batting conforming to type I of MIL-B-87002 except the use of recycled material (batting) is prohibited. The outer co
28、vering cloth shall conform to MIL-C-43774, except it shall have 69 filling yarns and the dimensional stability for warp and filling shall be 3 percent maximum. 3.3.3 Thread. The thread for assembling the outershell and for joining the outershell to the linings shall be a thread conforming to size T-
29、50 of MIL-T-44100, natural in color. As an alternate non-melting nylon (Aramid), natural shade, conforming to Size B and E of MIL-T-43636 may be used. 3.3.4 Interlining. The material for interlining the quilted lining of the hood shall be coated nylon taffeta conforming to type II of MIL-C-19699 exc
30、ept the colorfastness to crocking shall be not less than “fair“. 3.3.5 Elastic take-up strap . The material for the back take-up strap shall be elastic cotton webbing natural or dyed black conforming to class 1, of MILiW-5664, 3/4 inch wide, except that the colorfastness requirements shall not apply
31、. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-24925 3.3.6 Snap fasteners. The snap fasteners for attaching the hood front cover flap to the visor, the bib to the hood front cover flap, and to adjust the bib shall consist of Button and Soc
32、ket (female half), Stud and Eyelet (male half) and a combination Stud/Socket. The fasteners shall be style 2, 24-line (size 1) nickel plate or bright chrome finish conforming to MIL-F-10884, MS 27980 and the following part numbers: Button - 1N or 1C Stud - 7N or 7C Socket - 6N or 6C Eyelet - 8N or 8
33、C. 3.3.7 Chin (take-up) adjustment strap assembly. The chin strap assembly shall be as shown in drawing 16-1-847 and shall consist of cotton webbing with a hook and pile fastener closure. 3.3.7.1 Hook and pile fastener tape. The hook and pile fastener tapes shall conform to type II, class 1 of MIL-F
34、-21840. The tape shall be 5/8 inch wide for the chin strap, 1 and 2 inch wide for the frame cover assembly. The color shall be natural or black. 3.3.7.1.1 Webbing. The webbing shall be cotton, natural, bleached or dyed shade black conforming to type IIa, classes 1, 2, or 3, 3/4 inch wide conforming
35、to MIL-W-530, except that the colorfastness requirements shall not apply 3.3.7.1.2 Thread. The thread for assembling the chin strap shall be a thread conforming to ticket No. 50, 2 or 3 ply of MIL-T-43548. The color shall be natural or black. 3.3.8 Hood f acepiece assembly. 3.3.8.1 Visor. The visor
36、shall be polycarbonate sheeting conforming to MIL-P-46144, type I, grade A, clear, 0.125 (+ 0.015) inch thick or equal. Al1 dimensions shall be in accordance with draang 16-1-839. The visor shall be coated with anti-fog coating “Izonex“ by Exxene Corp. (see 6.4) or equal (see 4.4.1) . Stud/Eyelet sn
37、ap fasteners, and screws and posts shall be positioned according to drawing 16-1-839 with the studs on the outside of the visor. 3.3.8.2 Gold coated face shield. The material for the gold coated face shield shall be polyester type plastic film conforming to type III of L-P-377, except that the thick
38、ness shall be 0.007 (+ 0.001) inch and the maximum haze factor shall be 9.2 percent. The gold coated face shield shall be gold coated on one surface and then overcoated with an abrasion resistant coating (see 4.4.1) by vacuum deposition or other suitable techniques. The gold coated side shall be ide
39、ntified with the word “outside“ printed in black indelible ink letters of not less than 1/4 inch high along the edge of the sheet. The gold coated face shield shall be in accordance with drawing 16-1-842. It shall be positioned over the visor so that the “outside“ surface is away from the visor as s
40、hown in Figure 1. 3.3.8.3 Performance. The performance of the gold coated face shield and visor shall be as indicated below when tested as specified in 4.4.1. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-24925 84 W 979990b 0384625 2 = MIL-
41、H-24925 3.3.8.3.1 Vertex power and prismatic power. The vertex power of the visor, excluding the area 3/4 inch from the outer edge, shall not exceed the inherent power to the required curvature and thickness by more than + 0.06 diopters in any horizontal meridian when tested as specified in 4.4.1;l.
42、 The inherent power of the visor shall be calculated by use of the following equation: F = (Fi + F2) -t n - 1 2 . or 1-1 - F= -t n F = Inherent power of the visor in diopters. FI = Power of the front surface of the visor in diopters. F2 = Power of the back surface of the visor in diopters. n = Index
43、 of refraction of the visor material. t = Thickness of visor in meters. r = Radius of the front surface of the visor in meters. 1 = Radius of the back surface of the visor in meters. The vertical prismatic components at any two points on any given horizontal meridian of the visor excluding the area
44、3/4 inch from the outer edge shall not differ algebraically by more than 0.125 prism diopter and the absolute vertical prismatic deviation measured from any point in any horizontal meridian shall not exceed 0.125 prism diopter when tested as specified in 4.4.1.1. 3.3.8.3.2 Optical distortion. The go
45、ld coated face shield and the visor shall be free from any visible distortion or optical defects when tested as specified in 4.4.1.2. 3.3.8.3.3 Luminous transmittance. The luminous transmittance of the visor shall be not less than 20 percent (illuminant C) when tested as specified in 4.4.1.3. 7 Prov
46、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-24925 3.3.8.3.4 Adhesion of coatings, The coatings on the gold coated face shield shall not be removed when subjected to the adhesion test specified in 4.4.1.4.1. If there is visual evidence that some
47、 of the coatings were removed, the tested area of the gold coated face shield shall be tested again for optical distortion, hardness of coatings, and infrared radiant heat resistance. The gold coated face shield shall be acceptable if it meets the requirements of the above tests after the adhesion t
48、est. 3.3.8.3.5 Hardness of coatings. The coatings on the gold coated face shield shall not be removed or show visible evidence of marring or abrasion when tested as specified in 4.4.1.4.2. If there is visual evidence that some marring or coating removal has occurred, the tested area of the gold coat
49、ed face shield shall be tested again for optical distortion, luminous transmittance, and infrared radiant heat resistance. The gold coated face shield shall be acceptable if it meets the requirements of the above tests after the hardness test. 3.3.8.3.5.1 Cloth cheesecloth. The cheesecloth used in testing the hardness of coating for the gold coated face shield shall conform to type I, class 2 of CCC-C-440 (see 4.4.1.4.2). 3.3.8
