1、 The following commercial specification is originally adopted from the military document. Revision A included all known accepted revisions, amendments, notices, and Department of Defense (DoD) engineering changes previously developed for this item. Revisions B and forward include changes adopted to
2、reflect technology and design evolution. CLOTH, AIRPLANE The Parachute Industry Association makes this document available for use by Industry and Government organizations that wish to apply this specification to their products. 1. SCOPE 1.1 Scope. This specification covers cotton cloth in the types
3、as specified below and is intended for use in the integral surface coverings of airplanes, as a base for a modified butyl rubber coated cloth, and in military personnel and cargo parachute systems. Type I - mercerized cotton Type II - non-mercerized Supima cotton 2. APPLICABLE DOCUMENTS 2.1 General.
4、 The documents listed in this section are specified in Sections 3 and 4 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 o
5、f this list, document users are cautioned that they must meet all specified requirements of the documents cited in Sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government publications. 2.2.1 Government publications. The following Government publication forms a part of
6、this document. SPECIFICATIONS MILITARY MIL-D-5549 - Dope; Cellulose-Acetate- Butyrate, Clear for Aircraft Use PIA-C-5646D 19 June 2013 Superseding PIA-C-5646C 14 December 2009 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission
7、from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyright Protected: Do Not Copy!PIA-C-5646D (Unless otherwise indicated, copies of the above specification are available from the DLA Document Services, 700 Robbins Avenue, Bui
8、lding 4D, Philadelphia, PA 19111-5094. Electronic copies of Military and Federal standards and specifications may be obtained from https:/assist.daps.dla.mil/quicksearch/.) FEDERAL TRADE COMMISSION (FTC) 16 CFR 303 - Rules and Regulations Under the Textile Fiber Products Identification Act (Copies a
9、re available online at: www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W., Washington, DC 20580-0001. Electronic copies may also be obtained from http:/www.access.gpo.gov/.) 2.3 Non-government publications. The following documents form a part of this document. AMERICAN
10、ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 20 - Fiber Analysis: Qualitative AATCC 81 - pH of the Water-Extract from Wet Processed Textiles (Applications for copies should be addressed to the AATCC National Headquarters, P.O. Box 12215, Research Triangle Park, NC 27709-2215. Electron
11、ic copies may be obtained from www.aatcc.org.) AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies are available online at: www.asq.org or American Society For Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNAT
12、IONAL (ASTM) ASTM D 629 - Standard Test Methods for Quantitative Analysis of Textiles ASTM D 2165 - Standard Test Method for pH of Aqueous Extracts of Wool and Similar Animal Fibers ASTM D 3775 - Standard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabrics ASTM D 3776 - Standard Tes
13、t Methods for Mass Per Unit Area (Weight) of Fabrics ASTM D 3786 - Standard Test Method for Hydraulic Bursting Strength of Textile Fabrics-Diaphragm Bursting Strength Tester Method ASTM D 3951 - Standard Practice for Commercial Packaging Page 2 of 10 Copyright Protected: Do Not Copy!PIA-C-5646D ASTM
14、 D 5035 - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method) ASTM E 1452 - Standard Practice for Preparation of Calibration Solutions for Spectrophotometric and Spectroscopic Atomic Analyses (Withdrawn in 2005) (Application for copies should be addressed to the
15、ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Electronic copies may be obtained from www.astm.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,
16、 the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, and environmentally prefera
17、ble materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.2 Basic Material. The cloth shall be made from 2 ply combed yarns. Type I cloth shall be m
18、ade with yarns spun from mercerized cotton of a suitable staple length to assure conformance of the finished cloth to specification. When mercerized cotton has been used the yarn shall be mercerized under tension. Piece mercerization shall not be acceptable. Type II shall be made with yarns spun fro
19、m non-mercerized Supima cotton.3.3 Finish. Finishing shall consist of washing, framing and medium-cold calendaring. Calendaring shall be sufficient to lay any nap present and to provide a smooth even surface. Care should be taken to avoid excessive roll pressure on the cloth. 3.4 Color. The color sh
20、all be natural unless otherwise specified. 3.5 Physical properties. The finished cloth shall conform to the requirements in TABLE I when tested as specified in 4.4. (THIS SPACE LEFT INTENTIONALLY BLANK) Page 3 of 10 Copyright Protected: Do Not Copy!PIA-C-5646D TABLE I Physical properties. Notes: 1/T
21、his requirement does not apply to parachute systems. 2/Maximum yarns per inch does not apply to parachute use unless otherwise specified. 3.6 Width. The width of the finished cloth, inclusive of selvage, shall be as specified in TABLE II, unless otherwise required and specified in the procurement do
22、cument (see 6.1). TABLE II Width and tolerance of finished cloth. 3.7 Length of roll. The finished cloth shall be furnished in rolls containing the lengths in TABLE III, or as otherwise specified for direct Government contracts. TABLE III Roll lengths. 3.7.1 Length of cut. The length of a single cut
23、 of the finished cloth shall be not less than 40 yards, except that 10 percent of the total yardage of one width under any contract or order, may be short lengths from 10 to 25 yards and another 10 percent may be from 25 to 40 Characteristic Requirement Weave Plain (one up and one down) Weight, ozs.
24、/sq.yd. (maximum) 4.5 Yarns per inch 2/: Warp Filling 82 2 82 2 Breaking strength, lbs. (minimum) (Ravel Strip Method): Warp Filling 80 80 Elongation 1/, percent (maximum) (under 70 lbs. tension): Warp Filling 16.0 20.0 Bursting strength, lbs./sq.in. (min.) 1/170 Width Tolerances (inches) 36 1/2 60
25、1 90 1-1/2 Width (inches) Roll length (yards) 36 100 to 200 60 100 to 150 90 50 to 100 Page 4 of 10 Copyright Protected: Do Not Copy!PIA-C-5646D yards. No length shorter than 10 yards will be accepted. Short lengths shall be rolled together and the roll shall be properly labeled to indicate that it
26、is composed of short lengths. 3.8 Water soluble. The water soluble material of the finished cloth shall not contain more than 2.0 percent starch and protein, including chloroform and water-soluble material, when tested as specified in 4.4. 3.9 Copper and manganese. The finished cloth, when used as b
27、ase cloth for coating, shall contain no more than 0.003 percent copper and 0.0015 percent manganese when tested as specified in 4.4. 3.10 pH. The pH value of the water extract of the finished cloth shall be not less than 5.5 nor more than 9.0 when tested as specified in 4.4. 3.11 Compatibility with
28、dope. The finished cloth shall be compatible with aircraft dope as specified in 4.4.1. The dope shall dry within 45 minutes when applied to the finished cloth. This requirement applies for aircraft coverings only, unless otherwise specified. 3.12 Fiber identification. Each roll shall be labeled, tic
29、keted, or invoiced for fiber content in accordance with the Rules and Regulations under the Textile Fiber Products Identification Act. 3.13 Workmanship. The finished cloth shall conform to the quality established by this specification. The occurrence of defects shall not exceed the applicable accept
30、able quality limits. 4. VERIFICATION 4.1 Classification for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order,
31、 the contractor may use his own or any other facility 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 the specification where such inspections are deem
32、ed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Certificate of Compliance. Where Certificates of Compliance are submitted, the Government reserves the right to test such items to determine the validity of the certification. 4.2 Quality conformance inspection. S
33、ampling for inspection shall be performed in accordance with ANSI/ASQ Z1 .4, except where otherwise indicated. 4.2.1 Component and material inspection. In accordance with 4.1 above, components and materials shall be tested in accordance with all the requirements of referenced specifications, drawing
34、s and standards unless otherwise excluded, amended, modified or qualified in this specification or applicable procurement documents. In addition, the supplier shall submit a Certificate of Compliance identifying which type of cotton was used as specified in 1.1 and 3.2. Page 5 of 10 Copyright Protec
35、ted: Do Not Copy!PIA-C-5646D 4.2.2 Examination of the end item. Defects found during this examination shall be classified in accordance with 4.2.2.1 through 4.2.2.3. 4.2.2.1 Yard-by-yard examination. The required yardage of each roll shall be examined and the visual defects classified as listed in T
36、ABLE IV. All defects found shall be counted regardless of their proximity one to another, except where two or more defects represent a single local condition of the cloth, in which case only one defect shall be counted for each warp wise yard or fraction thereof in which it occurs. The unit of produ
37、ct for this examination shall be one linear yard. The sample size for the yard-by-yard-examination shall be determined in accordance with ANSI/ASQ Z1 .4, Inspection Level II; and the Acceptable Quality Limit (AQL) shall be 2.5 major defects and 6.5 total defects per 100 units. The lot size shall be
38、expressed in units of one yard each. The number of rolls sampled shall be in accordance with TABLE V and approximately an equal number of yards shall be examined in each roll. TABLE IV Classification of defects. Defects Major Minor Hole, cut or tear, including selvage X Smash, any X Broken or missin
39、g yarns: Three or more contiguous regardless of length X Two contiguous, 2 inches or more missing X Two contiguous, less than 2 inches, or single 2 inches or more missing X Fine filling bar or light place, clearly visible 1/X Thin place, open place, crack or hitchback opening at widest point three o
40、r more yarn diameters, or sequence of openings resulting in a weak spot X Thin place, open place, crack or hitchback opening clearly visible 1/, but opening at widest point less than three yarn diameters X Floats or skips - multiple, 1/2 inch or more in combined warp and filling directions, or harne
41、ss skips X Floats or skips - multiple, less than 1/2 inch in combined warp and filling directions, or single floating over 2 inches or more X Heavy filling bar, heavy place, coarse or additional yarns, clearly visible 1/thickening of cloth X Slough-off, jerked-in filling, slugs, slubs or gouts in ei
42、ther direction more than three times the thickness of normal yarn X Slough-off, jerked-in filling, slugs, slubs or gouts in either direction clearly visible 1/but not more than three times the thickness of normal yarn X Kinks - single, more than 1 inch in length, or multiple 1 inch or less in length
43、 X Spot, stain or streak - clearly visible 1/(Count regardless of cause, i.e., not restricted to rust, oil or grease). However, a rim or light detergent mark where a stain has been removed, shall not be classified a defect X Mixed filling, finishing mark, clearly visible at 6 feet distance X Wrinkle
44、 or crease - embedded X Knot - oversized, extending from surfaces of cloth X Wrong draw, reed mark - clearly visible X Temple mark - resulting in pin holes or frayed fibers, clearly visible 1/X Baggy, ridgy or wavy cloth, clearly visible 1/X Tender or weak place - any X Note: 1/Clearly visible at no
45、rmal examination distance of 3 feet. Page 6 of 10 Copyright Protected: Do Not Copy!PIA-C-5646D 4.2.2.2 Overall examination. Each defect listed below shall be counted not more than once in each roll examined. The unit of product shall be one roll. The sample size or number of rolls selected as sample
46、s, and the maximum number of defects acceptable, shall be shown in TABLE V. Overall defects: a. Color (when specified) off shade, shaded side to side, blotchy, mottled, two-sided b. Finish not as specified in 3.3 c. Overall uncleanness d. Objectionable odor 1/e. Excessive nappiness f. Uneven weaving
47、 for more than 20 yards continuously or intermittently g. Selvage tight, wavy, scalloped, cut or broken, curled, folded, rolled, slack or loopy, continuously or intermittently over more than half the piece. (Beaded selvage or thickening limited to outer reinforcing ends, and no more than two times t
48、he thickness of the selvage shall not be classified as a defect.) h. Width, less than minimum specified Note: 1/ Normal residual odor of chemicals commonly used to apply treatment of dyestuff for finish or color shall not be regarded as objectionable. TABLE V Examination of roll. Lot size in yards S
49、ample size (rolls) widths in inches Acceptance number 36” 60“ and 90” 36” 60“ and 90” Up to 1,200 1/2 3 0 0 1,201 to 3,200 3 5 0 0 3,201 to 10,000 5 7 0 0 10,001 to 35,000 7 10 0 0 35,001 to 150,000 10 15 0 1 150,001 and over 15 25 1 2 Note: 1/If a lot contains fewer than three pieces, each piece in the lot shall be examined for overall defects. 4.2.2.3 Examination for length. 4.2.2.3.1 Individual rolls. During the yard-by-yard examination, each roll in the sample shall be examined for length.
