1、 The following commercial specification is originally adopted from the military document. Revision A includes 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 by
2、DoD and Industry to reflect technology and design evolution. CLOTH, DUCK, NYLON 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 nyl
3、on duck cloth. 1.2 ClassificationClass 1 - Untreated . The nylon duck cloth shall be of the following classes, as specified (see 6.1). Class 2 - Melamine resin treated (extra stiff) (0.45-0.65 pounds warp/0.65-0.85 pounds filling) Class 3 - Melamine resin treated (parachute procurement only) (0.3-0.
4、4 pounds warp/0.4-0.5 pounds filling) 2. APPLICABLE DOCUMENTS 2.1. General2.2 . 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 nor is it recommended for additional inf
5、ormation or as examples. While every effort has been made to ensure the completeness of 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. Government publications. 2.
6、2.1 Government publications. The following Government publications form a part of this document (see 2.4). STANDARDS FEDERAL FED-STD-4 - Glossary of Fabric Imperfections FED-STD-595 - Colors Used in Government Procurement PIA-C-3953F 17 November 2010 Superseding PIA-C-3953E 21 February 2009 DISTRIBU
7、TION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission from the Parachute Industry Association. Additional copies may be purchased online from the PIA Store at: . PIA-C-3953F Page 2 of 9 (Unless otherwise indicated, copies of the above spe
8、cifications and standards are available from the Standardization Documents Order Desk, 700 Robbins Avenue, Building 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 COM
9、MISSION (FTC) 16 CFR 303 - Rules and Regulations Under the Textile Fiber Products Identification Act (Copies are available online at: www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, Washington, DC 20580-001. Electronic copies may be obtained from www.access.gpo.gov/.) 2.3
10、Non-government publications. The following documents form a part of this document. AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC-16 - Colorfastness to Light AATCC-61 - Colorfastness to Laundering: Accelerated AATCC-81 - pH of the Water-Extract from Wet Processed Textiles AATCC
11、-96 - Dimensional Changes in Commercial Laundering of Woven and Knitted Fabrics Except Wool AATCC Evaluation Procedures: - 1 Gray Scale for Color Change - 8 AATCC 9 -Step Chromatic Transference Scale - 9 Visual Assessment of Color Difference of Textiles (Applications for copies should be addressed t
12、o the AATCC National Headquarters, P.O. Box 12215, Research Triangle Park, NC 27709-2215. Electronic 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 (Applications for copies should be addressed
13、 to American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203. Electronic copies may be obtained from www.asq.org.) ASTM INTERNATIONAL (ASTM) ASTM D 276 - Standard Test Method for Identification of Fibers in Textiles ASTM D 1776 - Standard Practice for Conditioning and Testing T
14、extiles ASTM D 2261 - Standard Test Method for Tearing Strength of Fabrics by the Tongue (Single Rip) Procedure (Constant-Rate-of-Extension Tensile Testing Machine) PIA-C-3953F Page 3 of 9 ASTM D 3775 - Standard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabrics ASTM D 3776 - Stand
15、ard Test Methods for Mass Per Unit Area (Weight) of Fabric ASTM D 5034 - Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test) (Application for copies should be addressed to the ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Electronic
16、 copies may be obtained from www.astm.org.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-5202 - STIFFNESS OF CLOTH, DIRECTIONAL; CANTILEVER BENDING METHOD (Electronic copies may be obtained from .) 2.4 Revision levels of subsidiary documents. The documents listed in Section 2 shall be define
17、d as subsidiary documents, other Government documents, and non-government publications. Unless otherwise specified by the procuring activity, the revision level of subsidiary documents shall be the latest revision level as listed in the Acquisition Streaming and Standardization Information (ASSIST)
18、data base located at: https:/assist.daps.dla.mil/quicksearch/. 2.5 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 regulati
19、ons unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Standard. The finished cloth shall match the standard for shade and appearance and shall be equal to or better than the standard with respect to all characteristics for which the standard is referenced (see 6.2). 3.2 Material3.2.
20、1 . Nylon. The nylon shall be a high tenacity bright nylon polyamide. The nylon shall be either Nylon 6 with a minimum melting point of 392F (203C) or Nylon 6,6 with a minimum melting point of 471F (244C) when tested as specified in 4.2.3. 3.3 Color. The color of the finished cloth shall be as speci
21、fied by the procuring activity (see 6.1). 3.3.1 Visual shade matching. If the fabric is dyed, the color of the dyed fabric shall match the standard when viewed using the AATCC Evaluation Procedure 9, Option A, with sources simulating artificial daylight D75 illuminate with color temperature of 7500
22、200K, illumination of 100 20 foot candles, and shall be a good match to the standard under incandescent lamplight at 2856 200k. PIA-C-3953F Page 4 of 9 3.3.2 Colorfastness. 3.3.2.1 Dyed fabric. If the fabric is dyed, the dyed fabric shall show fastness as follows: Characteristic Rating (minimum) Lig
23、ht (Fade) 1/3-4 Laundering 2/3-4 Notes: 1/Rated using the AATCC Evaluation Procedure 1, Gray Scale for Color Change 2/Rated using the AATCC Evaluation Procedure 1, Gray Scale for Color Change and AATCC Evaluation Procedure 2, Gray Scale for Staining. 3.4 Physical requirements. The cloth shall confor
24、m to the minimum requirements specified in TABLE I when tested as specified in 4.2.3. TABLE I Physical requirements 1/Weight oz./sq. yard (g/m2) Yarns per inch (cm) Breaking strength pounds (N) Tearing strength pounds (N) Warp Filling Warp Filling Warp Filling 18.5 1 62 60 1100 1100 135 135 (627 34)
25、 (24) (24) (4893) (4893) (600) (600) Note: 1/Classes 2 4 picks per shed). 3.5 Finish. The cloth shall be dyed or natural and shall not be bleached in any manner or process. 3.5.1 Resin treatment. 3.5.1.1 Resin treatment, Class 2 (extra stiff)pounds load in the warp and 0.65 to 0.85 pounds load in th
26、e filling when tested as specified in 4.2.3. . The Class 2 cloth shall be impregnated with a suitable type of melamine resin and the finished cloth shall have a stiffness of 0.45 to 0.65 PIA-C-3953F Page 5 of 9 3.5.1.2 Resin treatment, Class 3 for parachute procurement only. The Class 3 cloth for pa
27、rachute procurement shall be impregnated with a suitable type of melamine resin and the finished cloth shall have a stiffness of 0.3 to 0.4 pounds load in the warp and 0.4 to 0.5 pounds load in the filling when tested as specified in 4.2.3. 3.5.2 pH3.6 . The pH value of the water extract of the fini
28、shed cloth shall not be lower than 5.5 or higher than 9.0 when tested as specified in 4.2.3. Dimensional stability3.7 . The cloth shall have no more than 2.0 percent dimensional change in either the warp or filling direction when tested as specified in 4.2.3. Length and put-up. As required by the cu
29、rrent procurement agency (see 6.1). 3.8 Identification of product. Each roll of finished cloth shall be marked for identification in accordance with good commercial practice. In addition, each piece of cloth in each finishers roll shall be clearly and legibly marked with the finishers roll number or
30、 code, as specified in 4.2, and each roll shall have attached a durable tag on which the finishers roll number or code is listed. The date of manufacture (see 3.9.1) shall be included on the tag attached to each roll. 3.9 Age. The cloth shall not be more than 3 years old from the date of manufacture
31、r to the date of fabrication of parachute assemblies. The 3 years age requirement, as per paragraph 3.3.2 of MIL-DTL-6645, is for personnel parachute cloth only. 3.10 Date of manufacture. The date of manufacture is defined as the date (month and year) of the last manufacturing processing that affect
32、s the physical characteristics of the cloth. This would not include slitting, inspection or rewinding. 3.11 Workmanship. The finished cloth shall conform to the quality established by this specification. The demerit points per 100 square yards (84 m2), when calculated as specified in Section 4, shal
33、l not exceed the established maximum point value. 3.12 Recycled, recovered, or environmentally preferable materials. Recycled, recovered and environmentally preferable material should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance
34、requirements and promotes economically advantageous life cycle costs. 4. VERIFICATION 4.1 Classification for inspectionperformance 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 t
35、his specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. . Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests)
36、as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use their own or any other facilities suitable for the 4.1.1 Responsibility for compliance. All items shall meet all requirements of Sections 3 and 4. The inspection set forth in this specificati
37、on shall become a part of the contractors overall PIA-C-3953F Page 6 of 9 inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government
38、 for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to the requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor doe
39、s it commit the Government to accept defective material. 4.1.2 Certificates of Compliance4.2 . When Certificates of Compliance are submitted, the Government reserves the right to inspect such items to determine the validity of the certification. Quality conformance inspectiontagged (see 3.8) with th
40、e number or code of the finishers roll of which it was a part. Unless otherwise specified by the procuring activity, sampling for examination shall be performed in accordance with section 4.2.2.1. . The quality conformance inspections shall be performed on every shippers roll, as specified. Shippers
41、 rolls are created after finishing when a finishers roll is divided for the purpose of handling and delivery. Each shippers roll shall be 4.2.1 Component and material inspectionunless otherwise excluded, amended, modified or qualified in this specification or applicable purchase document. . In accor
42、dance with 4.1, components and materials shall be inspected in accordance with all the requirements of referenced documents 4.2.2 End item examination4.2.2.1 . Examination of the end item shall be in accordance with the provisions of 4.2.2.1 through 4.2.2.4. Yard-by-yard examinationexamined. All def
43、ects, as defined in Section III of FED-STD-4, which are clearly noticeable at normal inspection distance (3 feet) shall be scored and assigned demerit points as listed in 4.2.2.1.1. No linear yard (increments of 1 yard on the measuring device of the inspection machine) from any one roll within the s
44、ample shall be penalized more than 4 points. The sample size shall be 20 rolls selected from 20 containers. The lot shall be unacceptable if the points per 100 square yards of the total yardage examined exceed 35 points. The lot shall be unacceptable if the points per 100 square yards or two or more
45、 individual rolls exceed 53 points. If one roll exceeds 53 points per 100 square yards, a second sample of 20 rolls shall be examined only for individual roll quality. The lot shall be unacceptable if one or more rolls in the second sample exceed 53 points per 100 square yards. Point computation for
46、 lot quality and individual roll quality shall be as follows: . Each roll in the sample shall be examined. When the total yardage in the roll does not exceed 100 yards, the entire yardage in the roll shall be examined. When the total yardage in the roll exceeds 100 yards, only 100 yards shall be (To
47、tal points scored in sample size x 3600) = Points per 100 (Contracted width of cloth (inches) x Total yards inspected) square yards 4.2.2.1.1 Demerit points. Demerit points shall be assigned as follows: PIA-C-3953F Page 7 of 9 For defects up to 3 inches in any direction One point For defects exceedi
48、ng 3 inches, but not exceeding 6 inches in any direction Two points For defects exceeding 6 inches, but not exceeding 9 inches in any direction Three points For defects exceeding 9 inches in any direction Four points Note: The following defects, when present, shall be scored four points for each yar
49、d in which they occur: Baggy, ridgey or wavy cloth Width less than specified Raw edge Poor dye penetration, mottled, streaky or cloudy Overall uncleanness Objectionable odor 1/. Note: 1/ Normal residual odor of chemicals commonly used shall not be regarded as objectionable. 4.2.2.2 Examination for length. 4.2.2.2.1 Individual rollstwo yards below the length marked on the roll ticket, or unless otherwise specified any piece less than 50 yards shall be rejected.
