1、I INCH-POUND 1 MI I, -C. - 4 3 7 O 1 B 30 July 1490 SUPERSEDING MIL-C-43701A 21 January 1987 MILITARY SPECIFICATION CORD, ELASTIC, NYLON OR POLYESTER This specification is approved for use by all Departments and Agencies of the Department of Defense. 1, SCOPE 1.1 Scope. This specification covers ela
2、stic cord encased within a braided nylon or polyester cover. 1.2 Classification. The cord shall be of the following types as specified (see 6.2). Type I - General purpose cord Type II - Lacing cord 2, APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards and handbooks. The f
3、ollowing specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, c
4、ited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be used in improving this document should be addressed to U.S. Army Natick Research, Development and Engineering Center, Natick, YA 01760-5014, by using the Standardizatio
5、n Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 8305 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
6、-C-4370LB 83 W 7777706 0448L05 L W *, + MIL-C-43701B SPECIFICATIONS FEDERAL A-A-203 UU-T-8 1 PPP-B-636 PPP-T-45 MI LI TARY MIL-C-3131 MIL-L-35078 STANDARDS FEDERAL FED-STD-191 FED-STD-595 MIL I TARY MIL-STD-105 - Paper, Kraft, Untreated - Tag, Shipping and Stock - Boxes, Shipping, Fiberboard - Tapes
7、, Gummed, Paper, Reinforced and Plain, for Sealing and Securing - Cordage; Packaging Of - Loads, Unit: Preparation of Semiperishable Subsistence Items; Clothing, Personal Equipment and and Equipage; General Specifications for - Test Textile Methods - Colors Used in Government Procurement - Sampling
8、Procedures and Tables for Inspection by Attributes (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 Non-Government publicat
9、ions. The following document forms a part of this document to the extent specified herein, Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not list
10、ed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and Material, 1916 Race Street,
11、Philadelphia, PA 19103-1187). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-43701B (Non-Government standards and other publications are normally available from organizations that prepare or distribute the documents. These documents may also
12、 be available in or through libraries or other informational services.) 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 takes precedence, Nothing in this document, however, supersedes applicable laws and
13、 regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.21, a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.3. 3.2 Standard sample. The cord shall match the standard sample for shade and shall be equa
14、l to or better than the standard sample with respect to all characteristics for which the standard sample is referenced (see 6.4). 3.3 Materials. It is encouraged that recycled material be used when practical as long as it meets the requirements of this document. 3.3.1 Yarn. The yarn used in the fab
15、rication of the cover sleeving of type I and type II cord shall be nylon or textured polyester yarn. The yarn used to overwrap the core (elastic strands) of the type II lacing cord shall be spun nylon or textured polyester. 3.3.2 Elastic strands. The elastic strands shall be made of a heat- resistan
16、t, compounded natural rubber, synthetic rubber, or a mixture thereof. The strands shall be of the gage specified in table I, when tested as specified in 4.5.3. 3.4 Color. Unless otherwise specified (see 6.2), the color of the cord shall be Canouflage Green 483 or shall approximate color chip number
17、34094 of FED-STD-595. When dyed cord is specified, the nylon or polyester yarn shall be dyed before braiding (see 3.4.1). 3.4.1 Color matching. The.shade of the dyed cord shall match the standard sample when viewed under filtered tungsten lamps that approximate artificial daylight and that have a co
18、rrelated color temperature of 7500 + 200K, with illumination of 100 2 20 foot candles, and shall be a good match to the standard sample under incandescent lamplight at 2300 2 200K. 3.4.2 Colorfastness. The dyed nylon or polyester yarns shall show fastness to weathering, laundering, and crocking equa
19、l to or better than the standard sample, or equal to or better than a rating of “good“ when tested as specified in 4.4.4. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-4370LB 3 797770b 0448307 5 MIL-C-43701B 3.5 Construction and physical r
20、equirements. The nylon or polyester yarns conforming to the physical requirements specified in table I, when tested as specified in 4.4.4. shall be tightly braided around multiple elastic strands to form a cord i TABLE I, Physical requiremen.ts and construction Weight (oz per Picks Diameter, linear
21、Elas tic Per ( inches) yard) strands Number of inch, Rubber Elongation Type 2 1/32 min. min. carriers min gage (percent) I 7/32 O, 70 35 16 carriers, 44 24-38 . 90-110 1 end per carrier II 3/16 o. 20 7 16 carriers, 24 36 115-140 1 end per (max. carrier fineness) or 8 carriers, 2 ends per carrier 3.5
22、.1 Cover braid. 3.5.1.1 Type I. The outer braid of the type I cord shall be braided so as to give a two over and two under conventional stitch (i.e., each carrier alternates with the next carrier in direction and each strand passes alternately over and under two of the opposite strands). 3.5.1.2 Typ
23、e II. The outer braid of the type II cord shall be braided over the core in a basket weave construction with the carriers braiding in pairs. 3.5.2 Core. - 3.5.2.1 Type I, The core of the type I cord shall be composed of a minimum of 35 unwrapped elastic strands grouped together and encased within th
24、e outer braid cover. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a MIL-C-4370 IB 3.5.2.2 Type II. The core of type II cord shall be composed of seven ends (elastic strands) of rubber, each end individually wrapped first, with four ends of singl
25、es nylon or polyester, S-twist and overwrapped with one end of.singles spun or filament nylon or polyester, Z-twist. 0 3.5.3 Length and tipping (type II, lacing cord only). The lacing cord shall be 24 inches (+ 1 inch) in length. The ends of the lacing cord shall be tipped with nylon sheets or film,
26、 or either tipped or impregnated with cellulose acetate or cellulose acetate butyrate to prevent raveling. The tipped or impregnated end shall be at least 1/2 inch in length. 3.6.1 Type I. Unless otherwise specified (see 6.2), the type I cord shall be The cord put-up on flat head type spools, contai
27、ning 144 -t 2 yards, with not more than three pieces per spool, and no one piece less than 10 yards in length. shall be wound on the spools so that each turn and layer is free from entanglement. 3.6.2 Type II. Unless otherwise specified (see 6.2), one gross of type II lacing cords shall be grouped f
28、ull length and securely tied together with cotton tape or twine. 3.7 Identification. Each spool of cord or gross of lacing cords shall have a ticket (identification tag) or label attached to it for identification purposes. The ticket shall conform to the requirements for type B, class 1, size 4 or 5
29、 of UU-T-81. The ticket shall be made of not less than 15-point paper stock and shall have a minimum tearing resistance in both directions (total) of 850 grams when tested as specified in UV-T-81. When spool labels are used, the label shall be attached in such a manner as to remain in place and be c
30、learly legible until all cord has been removed. All entries on the ticket or label shall be legibly printed, stamped, or typed with water insoluble ink. The ticket or label shall contain the following information: Stock number Nomenclature Do cumen t number Leng th Contract number and date Date of m
31、anufacture Contractors name 3.8 Workmanship. The end item shall conform to the quality of product established by this specification. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the
32、performance of all inspection requirements (examinations and tests) as specified herein. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-43701B Except as otherwise specified in the contract or purchase order, the contractor may use his own or
33、 any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies
34、 and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become part of the contractors overall inspection system or quality program. The absence of any inspe
35、ction requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable
36、 practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.1.2 Responsibility for dimensional requirements. Unless otherwise specified in th
37、e contract or purchase order, the contractor is responsible for ensuring that all specified dimensions have been met. When dimensions cannot be examined on the end item, inspection shall be made at any point, or at all points in the manufacturing process necessary to ensure compliance with all dimen
38、sional requirements. 4.1.3 Certificates of compliance. When certificates of compliance are submitted, the Government reserves the right to inspect such items to determine the validity of the certification. 4.2 Classification of inspections. The inspection requirements specified herein are classified
39、 as follows: a. First article inspection (see 4.3). b. Quality conformance inspection (see 4.4). 4.3 First article inspection, When a first article is required (see 3.1 and 6.2), it shall be examined for the defects specified in 4.4.2 through 4.4.3.2 and tested as specified in 4.4.4 and table IV. 4.
40、4 Quality conformance inspection, Unless otherwise specified, sampling for inspection shall be performed in accordance with MIL-STD-105. 4.4.1 Component and material inspection. In accordance with 4.1, components and materials shall be inspected in accordance with all the requiremects of referenced
41、documents unless otherwise excluded, amended, modified, or qualified in this specification or applicable purchase document. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-43701B 4.4.1.1 Component and material certification. A certificate of
42、compliance may be acceptable as evidence that the characteristics listed in table II conform to the specified requirements. TABLE II. Component tests Characteristic Requirement paragraph Test method Nylon or polyester yarns: Ma ter ia 1 Cover construction Core (singles type II) No. of yarns Directio
43、n of twist Elastic strands: Ma ter ia 1 Gage 3.3.1 3.5.1 3.5.2.2 3.5.2.2 3.5.2.2 3.3.2 Table I 1530 - i/ Visual 4050 i/ - - 4.5.3 - 1/ Refers to test method of FED-STD-191. 4.4.2 End item examination of type I cord. 4.4.2.1 Yard-by-yard examination (type I). The end items shall be examined for the d
44、efects listed below. All defects found shall be counted regardless of their proximity to each other. A continuous defect shall be counted as one defect for each linear yard or fraction thereof in which it occurs. The lot . size shall be expressed in yards. The sample unit shall be one linear yard. T
45、he inspection level shall be I and the acceptable quality level (AQL), expressed in terms of defects per hundred units, shall be 2.5, The number of spools from which the sample yardage is to be selected shall be in accordance selected rolls. . with table III. The sample yardage shall be apportioned
46、equally among the Defects Core not completely covered Any cut or tear Broken or missing end Spot or stain clearly visible at normal inspection distance (approximately Abrasion mark, resulting in a weak place Unevenly braided resulting in open place, break in continuity of braid 3 feet) or soft spot
47、7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-43701B TABLE III. Sample sizes Lot size (yards) Sample size ( spoo 1s Acceptance number up to 1,200 3 1,201 up to and including 3,200 5 3,201 up to and including 10,000 8 10,001 up to and includ
48、ing 35,000 13 35,001 up to and including 150,000 20 150,001 and over 32 4.4.2.2 Overall examination (type I). The end items shall be examined for the defects listed below. Each defect listed shal1,be counted not more than once in each spool examined. The sample size shall be the applicable number of
49、 spools indicated in table III. Each spool in the sample shall be examined over its entire length. The lot shall be rejected if the total number of defects in the sample exceeds the applicable acceptance number specified in table III. Defects Mottled, or uneven color, when dyed Not clean throughout Improperly wound resulting in kinking, knotting, entangling or slippage during unwinding or otherwise affecting free unhampered unw
