1、MIL-M-247L3 84 m 777Ob 0384282 7 MIL-M-24913 6 January 1984 MILITARY SPECIFICATION MASK, EXTREME COLD WEATHER, DRY AND WijT COLD This specification is approved for use by the Navy Clothing and Textile Research Facility, and is available for use by all Departments and Agencies of the Department of De
2、fese. . .I 1. SCOPE 1.1 Scope. This specification covers the requirements for a one type and size cold weather mask. 2. APPLICABLE DOCUMENTS 2.1 Government docunents. 2.1.1 Specifications and standards. Unless otherwise specified, the following specifications and standards of the issue listed in tha
3、t issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification.to the extent specified here in. SPECIFICATIONS FEDERAL DDD-L-20 . - Label, for Clothing , Ewipage; and Tentage (General Use) Beneficial comnents (recom
4、riendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Officer in Charge, Navy Clothing h Textile Research Facility, 21 Strathmore Road, Natick; MA 01760 by using the self-addressed Standardization Document Improvement .Propsa
5、l (DD Fonn 1426) appearing at the end of this document or by letter. FSC 8415 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILITARY MIL-W-5664 MIL-B-17757 MIL-F-21840 MIL-T-83193 MIL-C-83429 - FEDERAL FED-STD-191 FED-STD-40 6 FED-STD-751 MILITARY
6、MIL-STD-105 MIL-STD-129 MIL-M-2Ll7L3 4 9797906 03Ll283 O MIL-M-24913 - Wbbing, Textile, Elastic, Cotton - Boxes, Shipping, Fiberboard (Modular Sizes) - Fastener Tapes, Hook and Pile, Synthetic - Thread, Aramid, Spun Staple - Cloth, Plain and Basket Weave, Aramid - Textile Test Methods - Plastics: Me
7、thod of Testing - Stitches, Seams and Stitching - Sampling Procedures and Tables for Inspection - Marking for Chipent and Storage by Attributes (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be obtaine
8、d from the procuring activity or as directed by the contracting officer.) 2.1.2 Other Government documents and publications. The following other Government documents and publications form a Part of this specification to the extent specified herein. LAWS AND REGULATIONS US POSTAL SERVICE MANUAL (Copi
9、es of the manual may be obtained fran the Superintendent of Documents, US Government Printing Office, Washington, DC 20402). (Copies of documents required by contractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the contracting o
10、ff her. ) 2.2 Other publications. The following documents form a part of this spcfication to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply NATIONAL MYIOR FREIGHT TRAFFIC ASSOCIATION, INC., XENT National
11、 Motor Freight Classification (Application for copies shall be addressed to the American Trucking Association, Inc., Traffic Departnient, 1616 P Street, N.W., Washington, D.C. 20036. ) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-24713 84
12、W 7779706 0389284 2 W MIL-M-249 13 UNIFRH CLASSIFICATION COMMITIEE, AGENT uniform Freight ClassiEication (Application for copies shall be addressed to the Uniform Classification Ccmnittee, Roan 1106, 222 South Riverside Plaza, Chicago, IL 60606.) AMERICAN SOCIETY FOR TESTING AND MATERIAES (ASTM) D15
13、64 - Testing Flexible Cellular Materials - Slab, Bonded, and Molded Urethane (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) Foams 2.3 Order of precedence. In the event of a conflict between the text of this do
14、cument and the references cited herein, the text of this document shall take precedence. 3. REQUIREMENTS 3.1 Guide sample. Samples, when furnished, are solely for guidance and information to the contractor (see 6.3). Variations frm this specification may appear in the sample, in which case this spec
15、ification shall govern. 3.2 First article. When specified (see 6.2, 4.3, and 6.4) the contractor shall furnish a sample for first article inspection and approval. 3.3 Materials. 3.3.1 Basic material. The basic material for the face mask shall be made from a woven aramid fabric, a microprous plastic
16、film, a polyurethane foam, and a cotton knit fabric laminated together in the order stated. The faee side of the laminated material will be the woven aramid fabric. The basic material components shall comply with the requirements of 3.3.1.1, 3.3.1.2, 3.3.1.3, 3.3.1.4 and 3.3.1.5. The material used f
17、or the outer layer (face) of the mask shall be a woven aramid fabric conforming to type II of MIL-C-83429, except that the color shall be Sage Green 3734. 3.3.1.1 Outer layer. 3.3.1.2 Inner layer, (plastic film). The plastic film used as a misture barrier in the laminated material shall be microporo
18、us polytetrafluoroethylene (PTFE) weighing 0.5 5 0.1 ounces per square yard when tested as specified in 4.4.1. The color of the film shall be natural or white (see 6.5). 3.3.1.3 Inner layer (foam). The foam used as an insulator in the laminated material shall be made of unpigmented polyurethane conf
19、orming to the following requirements when tested as specified in 4.4.1. (see 6.5). - Characteristic Requirement Thickness, inch 0.235 thru 0.250 Tear strength, pounds per inch of thickness, Ccmpression set, percent, max. 15.0 Density, pounds per cubic foot, max. 2 .o min. 3.5 3 Provided by IHSNot fo
20、r ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-M-247L3 84 m 7777906 0384285 4 m MIL-M-24913 3.3.1.4 Back layer (knit cloth). The material used as a lining for the laminated material shall be a cotton flat jersey knit cloth confonning to the follcwing requirements w
21、hen tested as specified in 4.4.1 (see 6.5). Characteristic Typ of yarn Yarns per inch Weight per square yard, ounces Bursting strength, pounds Shrinkage or elongation, percent Wales direction Course direction Non-fibrous matter, percent pH value Color Wales Courses 3 Requirement single or 2 ply, com
22、bed cotton 30 (min.) 36 (min.) 3.3 (min.) 55 (min.) 12 .o 12.0 6.0 (max.) 6.0 to 8.0 bleached 3.3.1.5 Laminated cloth. The finished laminated cloth described in 3.3.1 shall conform to the follwing requirements when tested as specified in 4.4.1. Characteristic Thickness, inches Weight per square yard
23、, ounces Shrinkage, percent Length direction width direction Moisture vapoz transmission rate, gms/m /24 hrs. Hydrostatic resistance, high, PSI initial After strength of coating Hydrostatic resistance, law Delamination after laundering Requi remient 0.180 (min.) 13.0 (min.) 5.0 (max.) 5.0 (max.) 300
24、 (min.) 90 (min.) 85 No eakage No delamination 3.3.2 Webbing. The elasticized cotton webbing used for the head harness and neck band shall be black, 1 inch wide, conforming to class 1 of MIL-W-5664. 3.3.3 Fastener tape. The material used for the adjustable neck band shall be 1 inch wide hook and loo
25、p fastener tape conforming to type I, class 1 of MIL-F-21840. The color shall be Black 3230 or Green OG 106. 3.3.4 Thread. The thread used for stitching and overedging the mask shall be 100 percent aramid, shade olive green, conforming to MIL-T-83193. 3.3,5 Ring. The ring (rectangular or oval shape)
26、 used as a slide for the . adjustable neck band shall be made of 0.100 to 0.110 diameter, low brass 80% minhum 8 hard temper wire, welded or unwelded, with a durable black finish. The inside measurements of the ring shall be 1 inch wide and 3/8 to 1/2 inch in height. The ring shall be tested a speci
27、fied in 4.4.1 (see 6.5). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-247L3 C 799970b 0384286 b 3.3.6 Label. Each mask shall have a combination identif ication/instruction lakl conforming -to type. VI, class 4 of DDD-L-20. The label shall
28、masure 1 5 1/16 inches in height by 1.-1/2 *- + 1/16 inches wide and shall contain the following information: - . y . MASK, EXTREME COLD WEATHER OWRAcr NO. SUPPLIER.S NAME - HAND LAUNDER ONLY. * - 1 STOCK NO. - _. 3.4 Design. The mask is made of- Figures are furnished for information purposes only.
29、To the extent of any inconsistencies between the written document and the figures, the document shall govern. 3.5 Patterns.: Standard patterns will be furnished by the Govenment. The standard patterns shall not he al.tered ih any way and are to be used as a guide for cutting the. contractors working
30、 patterns. . Since the patterns do not provide a 1/8 inch trirwoff for overedgeing, the use of a knife shall not be permitted during the overedge operation. 3.5.1 List of pattern parts. The mask shall be cut fr-om the materials specified herein in accmdance with the nUr33er of pattern parts indicate
31、d below: Material Pattern nomenclature Cut parts Laminated -fabric Face 1 (3.3.1) Nose cover 2 Nose-bridge cushion . 1 Nose closure template - 3.5.2 Stitches, seams, and stitching. All- stitches, seams, and stitching shall conform to FED-SW751. The type of sean, stitching, and stitches per inch shal
32、l be as specified in Table I. Seam allowances shall be mintained with seams sewn so that no run-Offs, pleats, puckers, or open seams occur. Unless otherwise specified, ends. of all stitching shall be back stitched or overstitched 3/8 inch minhum, except when caught in other stitching. Thread tension
33、 shall be maintained so that there will be no loose stitching, resulting in loose top or bottom thread or excessively tight stitching, resulting in puckering When thread breks or bobbin run-outs occur, the stitching shall be repaired by restarting the stitching a minimum of 3/8 inch back of the end
34、of the stitching, The fabric brght for the overedge stitching shall be 3/16 to 1/4 inch and a trimoff knife shall not be used. r. 3.6 Manufacturing operation requirements. The mask shall be manufactured in accordance with the operation requirements specified in Table I. is not required to follow the
35、 exact sequence of operations. The contractor . 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-ZLt9L3 BLt m 779990b 038qZ7 m MIL-M-24913 TABLE I - CONSTRUCTION OF MASK No. Operation 1. Cutting. a. Cut all material in strict accordance with p
36、atterns furnished, which show direc- tional lines, notches and location marks fo assembling cmpnent parts. The sage green aramid fabric shall be considered the face side of laminated material. b. Cut two strips of 1 inch wide elastic webbing for head harness (over-the-head) each 10 (+ - 1/4) inches
37、long. c. webbing for head harness (back-of-the- head) 14 1/2 (+ - 1/4) inches long. Cut one strip of 1 inch wide elastic d. Cut one strip of 1 inch wide elastic webbing for neck adjustment strap, 19 (+ - 1/41 inches long. e. Cut one strip of 1 inch wide loop fastener tape for neck adjustment strap,
38、8 (+ - 1/4) inches long. f. Cut one strip of 1 inch wide hook fastener tape for neck adjustment strap, 4 (+ - 1/41 inches long. 2. Replacement of defective components. During the spreading, cutting, and manufacturing process, components having material defects or damages that are classified as defec
39、ts in Section 4, shall be removed from production and replaced with nondefective and properly matched coniponents . 6 Stch Fuee %am/ itch tyE! Stch, in - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-24913 TABLE I - COSEIRUCTION OF MASK NO pe
40、rat ion 3. Make head harness. a. Center and lap the two 10 inch long strips of elastic webbing, side by side, over the 14 1/2 inch long strip of webbing for a distance of 3/4 inch perpendicularly. Stitch across the full width of the two 10 inch long strips of webbing with two rows of stitching down
41、the center parallel to the 14 1/2 inch long strip of webbing. b. Position the cambination indentific- tion and instruction label over the two stitched down ends of webbing and stitch label thru all plies 1/16 inch frcm all four sides of label. be parallel to the 14 1/2 inch long strip of webbing. co
42、ver the cut ends of lapped webbing and shall face towards the wearer. Length of label shall Label shall be wide enough to 4. Make neck adjustment strap. a. long strip of 1 inch wide loop tape on one side and end of the 19 inch long strip of 1 inch wide elastic webbing. The loop tape shall extend 1/8
43、 to 1/4 inch beyond the end of elastic webbing. Stitch perimeter of thf loop tape, except extension end, 1/16 to l/t inch from edge. Suprknpse the back side of the 8 inch b. long strip of 1 inch wide hook tape on the 19 inch long strip of 1 inch wide elastic webbing, approximately 1 inch fran the op
44、posite end of the elastic webbing on the same side as the stitched loop tape. Superimpose the back side of the 4 inch c. Fold back the L inch extension of the elastic webbing and insert the end under the hook tape for a distance of approxi- mately 1/4 inch. of the hook tape twice around with 1/16 to
45、 1/8 inch edge stitching, simultaneously catching the end of the elastic webbing. Stitch entire perimeter 7 Ctch ?YEEL 301 30 1 301 301 301 *m/ Xch typ Similar to Ea-2 Ebj-1 Ebj-1 Ebj-1 - s tch/ in 10-12 8-12 10-12 10-12 10-12 Thread gdl Provided by IHSNot for ResaleNo reproduction or networking per
46、mitted without license from IHS-,-,-MIL-M-24913 TABLE I - CONSTRUCTION OF MASK No. Operation 5. Make nosecover. a. Suprimpose the two nosecover pieces, face to face, and stitch 3/16 to 1/4 inch gage at center seamline starting at the notch indicated on patterns and ending at a pint approximately 1/4
47、 inch from the top of nosecover at center, a distance of about 1 3/4 inches. b. and loop fastener tape, c. Spread open seam allowances of center joining seam, simultaneously turning under the edges of the two free flaps 1/4 inch, and stitch entire length of nosecover 1/16 to 1/8 inch frm the seamlin
48、e of the join- ing seam and folded edges of left and right flaps. Cut out a 3 1/4 inch long piece of hook d. Align the selvage edge of the 3 1/4 inch long piece of hook fastener tape on the underside of the folded edge of the left flap (as worn). with a triangular shaped stitchline. trbing in the le
49、ngth of the hook tape may be required to fit the nose flap properly (see figure 4). e. Align the selvage edge of the 3 1/4 inch long piece of loop fastener tape with the cut edge of the turn under on the right flap (as worn) and stitch 1/16 to 1/8 inch from folded edge of flap. This stitchline may be performed simultaneously with the edge stitch performed in operation 5.c. loop tape may be required to fit nose flap p
