1、MIL-C-7020H 83 79799Ob 0509bb4 3 ! I INCH-POUND I MIL-C-7020H 16 March 1992 SUPERSEDING MIL-C-7020G 22 August 1978 MILITARY SPECIFICATION CLOTH, PARACHUTE, NYLON-RIP STOP AND TWILL WEAVE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1
2、. Scope. This specification covers rip stop and twill weave nylon parachute cloth. 1.2 Classification. There shall be six types of nylon cloth of the following types and weaves, as specified (See 6.2). Type 1 - 1.1 oz./sq. yd., Rip Stop Weave Type II - 1.6 oz./sq. yd., Twill Weave Type III - 1.6 oz.
3、/sq. yd., Rip Stop Weave Type Ia - 1.1 oz./sq. yd., Rip Stop Weave, Reinforced Selvage Type IIa - 1.6 oz./sq. yd., Twill Weave, Reinforced Selvage Type IIIa - 1.6 oz./sq. yd., Rip Stop Weave, Reinforced Selvage 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards. and ha
4、ndbooks. The following 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 supplem
5、ent thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Technology Sr Industrial Services Division, SA-ALC/TIRDM, Kelly AFB, TX 78241-5000 by using the
6、Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7020H SPECIFICATIONS FEDERAL PPP-P-1133 - Packaging and Packing of Synthetic Fiber
7、Fabrics. STANDARDS FEDERAL FED-STD-191 - Textile Test Methods. MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-109 - Quality Assurance Terms and Definitions. MIL-STD-851 - Coding; Manufacturers Color, Nylon by Attributes. Parachute Cloth. (Unless otherwise indicated, cop
8、ies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, dra
9、wings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. Rules and Regulations Under the Textile Fiber Products Identification Act. (Application for copies should be addressed to the Federal Trade
10、 Commission, Washington, DC 20580.) FAR 27 (DOD Supplememt) - Data Requirements. DDD 5000.19-L, Volume II- DOD Acquisition Management System and Data Requirements Control List (AMSDL). (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available
11、from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) (Copies of.specifications, standards, and other government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activit
12、y or as directed by the contracting officer . ) 2.2 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 regulations unless a sp
13、ecific exemption has been obtained. 3. REQUIREMENTS 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7020H 3.1 Material. The nylon used in the manufacture of all types of parachute fabric shall be multi-filament, bright, high tenacity, light a
14、nd heat resistant polyamide prepared from hexamethylene diamine and adipic acid, or irs derivatives. It shall have a melting point of 489O 2 go Fahrenheit (F) (254O 2 5O Celsius (C) when tested in accordance with 4.5. The yarn shall not be bleached in any manner or process. The use of any recycled m
15、aterial is prohibited; unless otherwise specified. 3.1.1 Yarn twist. Any yarn twist (warp andlor filling) is acceptable, but not required, provided all requirements of this specification are satisfied. 3.2 Fiber identification. Each roll of the finished cloth shall be labeled or ticketed and invoice
16、d for fiber content in accordance with the Rules and Regulations Under the Textile Fiber Products Identification Act. 3.3 Weave. 3.3.1 Type I weave. The weave pattern for type I cloth shall be as specified in figure 1. Reinforcement ribs in both warp and filling shall form a . uniform pattern of squ
17、ares. A = Two warp ends woven as one. 2B = Two filling picks per shed. One repeat of weave pattern shown. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7020H 83 W 99999Ob 0509bb7 9 W MIL-C-7020H 3.3.2 Type II weave. The weave pattern for ty
18、pe II cloth shall be a two-up 9 and one-down twill. 3.3.3 Type III weave. The weave pattern for type III cloth shall be as specified in figure 2. Reinforcement ribs in both the warp and the filling directions shall approximate squares. lA = Two warp ends woven as one. 2B = Two filling picks per shed
19、. One repeat of weave pattern shown. 3.3.4 Types Ia, IIa and IIIa. The weave of the edge for types Ia, IIa and IIIa shall be of a construction that will meet the requirements in table I. If the fabric is woven wider than 36 inches and is cut to a narrower width, a false selvage with the same require
20、ments as specified in table I shall be wover. and the cut made 1/8 inch from the false selvage using a heat sealed edge. This heat seeled edge shall be straight, have no loose yarns greater than 1/8 inch in length, be effectively locked against fraying, have no sharp or protruding edges, and shall m
21、eet all other requirements of this specification. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7020H 83 9999906 0509668 O MIL-C-7020H TABLE I. Physical properties. Property Yarns per inch (Minimum) Warp Filling Weight, ounces/square yard (
22、Maximum) Thickness, inches (Maximum) Breaking strength, pounds per inch (Minimuml ) Warp and Filling Elongation, percent (Minimum1) Warp and Filling Tear Strength, pounds (Minimum1) Warp and Filling Air permeability, cubic feet: per minute per square feet Selvage requirements2 Width . Thickness, inc
23、hes (Maximum) Breaking strength., pounds3 Types I Sr Ia 120 120 1.1 O. 003 42 20 5 100 220 112 2118 O. 005 75 Types II Sr IIa 120 76 1.6 O. 004 50 20 5 130 230 1/2 +1/8 O. 005 75 Types III Sr IIIa 120 76 1.6 O. 004 50 20 5 130 230 112 +1/8 O. 005 75 lAll individual readings shall meet or exceed the
24、minimum requirement. 2Types Ia, IIa, and IIIa only. 3P0r 3 14 inch wide specimen. 3.4 Physical and chemical properties. The physical and chemical properties shall conform to table I and the following subparagraphs thereto. The frequency of testing shall be dependent on the width of the fabric delive
25、red. For fabrics wider than 36 inches, the number of tests made shall be increased proportionately with the increase of width-for example, 1/3 more readings (two) shall be taken for 48 inch wide fabric. For 72 inch wide fabric delivered without splitting, the number of tests shall be doubled; if the
26、 fabric is split by the finisher, the fabric is considered as 36 inches wide and will be tested at the frequency specified herein. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7020H 83 9999906 0509bb9 2 W MIL-C-7020H 3.4.1 Permanence of se
27、t. When the cloth is subjected to the test specified in 4.5.2, the permanence of the cloth set shall be as follows: a. The average of the air permeability readings taken after testing shall be within 15 percent of the average of the readings taken before testing. b. The cloth shrinkage measured afte
28、r testing shall not exceed three (3) percent in either the warp or filling direction. 3.4.2 Nonfibrous materials. 3.4.2.1 Silicone oil. The finished cloth shall contain a silicone oil; so applied that it is evenly distributed throughout the cloth. The amount of oil added shall be a minimum of 0.3 pe
29、rcent based on the weight of the dry cloth. The finisher shall submit a certification for each finishers roll (see 4.4) indicating that the silicone oil was used (see 6.3). c P 3.4.2.2 Chloroform soluble material. The chloroform soluble material of the finished cloth shall not exceed 2.0 percent whe
30、n tested as specified in 4.5. 3.4.3 Acidity - alkalinity (DH). The pH value of the finished cloth shall be within the range of 5.5 to 9.0 when tested as specified in 4.5. 3.4.4 Color. The color shall be as specified by the procuring activity. 3.4.4.1 Colorfastness. Unless otherwise specified by the
31、procuring activity, the dyed and finished cloth shall show “GOOD1 fastness to light and crocking when tested as specified in 4.5. 3.4.5 Light and heat resistance. The finished cloth shall not lose more than 25 percent of its original strength when tested in accordance with 4.5. 3.4.6 Dimensions. 3.4
32、.6.1 Width. Unless otherwise specified by the procuring activity, the overall width of the finished fabric shall be 36 1/2 inches 5 1/2 inch or 48 1/2 inches 1/2 inch. The acceptable width shall be inclusive of the selvages but exclusive of fringed ends produced on shuttleless looms (see 6.2). 3.4.6
33、.2 Length and put up. The fabric shall be in roll form as specified by the procuring activity. 3.4.6.2.1 Length and put up for fabric shipped to government activity. Unless otherwise specified (see 6.2), the fabric shall be in continuous lengths, each not less than 100 yards with the following excep
34、tions: A maximum of 9 percent of the yardage may be in pieces that are 50 to 99 yards long, and a maximum of 1 percent in 25 to 49 yard pieces. 3.5 Identification yarns. Dyed yarns shall be woven 1 1/2 inches 1/2 inch from selvage edges of the cloth to identify the cloth to the procuring activity. W
35、hen a false selvage is to be removed during the manufacturing of the end product, the identification yarns shall be woven within 1 1/2 inches of the cut edges, 5 1/2 inch. The colors used shall be those indicated in MIL-STD-851. Additional dyed yarns may be used to identify the converter (supplier)
36、provided 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.8 Workmanship. The finished cloth shall be clean and evenly woven and shall conform to the quality and grade of product established by this specification. The finished cloth shall be free f
37、rom defects except to the extent specified herein. 4. QUALITY ASSURANCE PROVISIONS MIL-C-7020H 83 m 9999706 0509670 9 W MIL-C-7020H that the converter has identification yarns assigned by MIL-STD-851 or by the procuring activity. The dye used in the marker yarns shall have no deteriorative effect on
38、 the physical properties of the yarn, and the dyed yarns shall show no bleeding or color transfer when subjected to the tests as specified in 4.5. 3.6 Identification of product. Each roll of finished cloth shall be marked for identification in accordance with PPP-P-1133. In addition, each piece of c
39、loth in each fnishers roll shall be clearly and legibly marked with the finishers roll number or code, as specified in 4.3, and each roll shall have attached a durable tag on which the finishers roll number or code is listed. The date of manufacture of the cloth shall be included on the tag attached
40、 to each roll. 3.7 h. The cloth shall be not more than 3.5 years old from the date of manufacture of the yarn to the date of delivery of cloth. 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all in
41、spection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Governme
42、nt. 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 and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet all requirements of section
43、s 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 inspection requirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplie
44、s submitted to the Government for acceptance comply with all requirements of the contract. Sampling for quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 Classification
45、 of inspection. The inspection and testing of nylon parachute cloth shall be classified as follows: a. Quality conformance inspection (see 4.3). b. Quality conformance testing (see 4.4 and 4.5). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C
46、-7020H 4.2.1 Certificates of compliance. When certificates of compliance are submitted, the Government reserves the right to inspect and/or test such items to determine the validity of the certificate. 4.3 Quality conformance inspection. The quality conformance inspections shall be performed on each
47、 and every shippers rolls as specified. Shippers rolls are created after finishing when a finishers roll is divided for the purpose of handling and delivery. Each shippers roll shall be tagged (see 3.6) with the number or code of the finishers roll of which it was a part. Unless otherwise specified
48、by the procuring activity, sampling for examination shall be performed in accordance with section 4.4.3. 4.3.1 Components and material. In accordance with 4.1, components and materials shall be tested (see 4.4.1 and table II) in accordance with all the requirements of referenced documents unless oth
49、erwise specified by the procuring activity. Material warp and filling yarns Identification yarns TABLE II. Character- istics Tenacity Luster Melting point Bleaching Heat and light resistance Colorfastness to laundering Deleterious effect of dye Components a squirement aragraph 3.1 3.1 3.1 3.1 3.1 3.4.4.1 3.5 1 materials. ED-STD- 19 1 :est method i/ 1 i/ 1 1534 Il 1 c 1 5614 i/ 1 lests for- !ach pra- uct used Results Reported Pass or
