1、 The following commercial specification is adopted from the military document. Initial and 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 to
2、 reflect technology and design evolution. CLOTH, PARACHUTE, 240-PERMEABILITY; FOR USE WITH UNDERWATER ORDNANCE 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
3、. This specification covers parachute cloth having the weave pattern indicated in FIGURE 1 and an air permeability of 240 cubic feet per minute per square foot of cloth. It is intended for use with underwater ordnance. 1.2 Type and Class designation. The parachute cloth shall be of the following typ
4、es and classes, as specified (see 6.2). Type I - Nylon Type II - Saponified Acetate Class A - 4.0 ounce Class B - 8.0 ounce Class C - 10.0 ounce 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in Sections 3 and 4 of this specification. This section does not in
5、clude documents cited in other sections of this specification nor is it recommended for additional information 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
6、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 publications form a part of this document. PIA-C-17208B 09 April 2013 Superseding PIA-C-17208A 30 August 2009 DISTRIBUTION STATEMENT: All Ri
7、ghts Reserved. No Part of this publication may be reproduced without prior written permission from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyright Protected: Do Not Copy!PIA-C-17208B STANDARDS FEDERAL FED-STD-4 - Glossar
8、y of Fabric Imperfections (Unless otherwise indicated, copies of the above specifications 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 ma
9、y be obtained from https:/assist.daps.dla.mil/quicksearch/.) FEDERAL TRADE COMMISSION 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, N.W., Washington,
10、DC 20580-0001.) 2.3 Non-government publications. The following documents form a part of this document. AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 81 - pH of the Water-Extract from Wet Processed Textiles AATCC 106 - Colorfastness to Water: Sea (Applications for copies should
11、 be addressed to 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 shou
12、ld be addressed 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 Methods for Identification of Fibers in Textiles ASTM D 737 - Standard Test Method for Air Perm
13、eability of Textile Fabrics ASTM D 1776 - Standard Practice for Conditioning and Testing Textiles ASTM D 1777 - Standard Test Method for Thickness of Textile Materials ASTM D 2261 - Standard Test Method for Tearing Strength of Fabrics by the Tongue (Single Rip) Procedure (Constant-Rate-of -Extension
14、 Tensile Testing Machine) Page 2 of 9 Copyright Protected: Do Not Copy!PIA-C-17208B ASTM D 3774 - Standard Test Method for Width of Textile Fabric ASTM D 3775 - Standard Test Methods for Warp (End) and Filling (Pick) Count of Woven Fabrics ASTM D 3776 - Standard Test Methods for Mass per Unit Area (
15、Weight) of Fabrics ASTM D 3882 - Standard Test Method for Bow and Skew in Woven and Knitted Fabrics ASTM D 5035 - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method) (Application for copies should be addressed to the ASTM International, 100 Barr Harbor Drive, Wes
16、t Conshohocken, PA 19428-2959. Electronic copies may be obtained from www.astm.org/.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-503 - PERMANENCE OF SET AND SHRINKAGE IN PARACHUTE FABRICS (BOILED WATER TEST METHOD) 2.4 Order of precedence. Unless otherwise noted herein or in the contract i
17、n 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 specific exemption has been obtained. 3. REQUIREMENTS 3.1 Materials. 3.1.1 T
18、ype I. The material used in Type I cloth shall be a high-tenacity multifilament nylon yarn of the proper size to meet the applicable requirements of this specification. 3.1.2 Type II. The material used in Type II cloth shall be a continuous multifilament saponified oriented cellulose acetate yarn of
19、 the proper size to meet the applicable requirements of this specification. 3.2 Finish. The finished cloth shall be smooth and even and shall not contain sizing, lubricating, or weighting materials. The pH of the water extract shall be in the range from 5.5 to no more than 9.0. 3.3 Color. The color
20、of the finished cloth and its referenced standard shall be as specified by the procuring activity (see 6.1). 3.3.1 Camouflaging. When camouflaging is specified (see 6.2), the pattern and colors shall be in exact accordance with samples or instructions supplied by the procuring activity. Colors shall
21、 show good fastness to salt water when tested as specified in TABLE II. 3.3.2 Coloring matter. Unless otherwise specified (see 6.2), no coloring matter of any Page 3 of 9 Copyright Protected: Do Not Copy!PIA-C-17208B sort shall be added to the yarn or cloth. 3.4 Permanence of set. The permanence of
22、set of the cloth shall be as specified in 4.4.1. 3.4.1 Air permeability. The air permeability shall be within the limits specified in TABLE I after testing as specified in TABLE II. 3.4.2 Thickness. The thickness of the cloth shall not increase more than 10 percent after testing as specified in TABL
23、E II. 3.4.3 Shrinkage. The cloth shrinkage shall not exceed 2 percent in the warp or 1 percent in the filling after testing as specified in TABLE II. TABLE I Physical requirements. Physical requirement Type I Type II Class A Class B Class C Class A Class B Class C Weight, oz. per sq. yd, maximum 4.0
24、 8.0 10.0 4.0 8.0 10.0 Breaking strength, pounds per inch of width, minimum: Warp direction Filling direction 200 400 480 175 330 400 200 400 480 175 330 400 Elongation, both directions, percent, minimum 25 30 30 10 10 10 Tear resistance, pounds, minimum: Across warp Across filling 25 50 60 25 50 60
25、 25 50 60 25 50 60 Air permeability, cu. ft. per minute per sq. ft. of cloth 240 30 240 30 240 30 240 30 240 30 240 30 3.5 Physical requirements. The finished cloth, including camouflage when specified, shall conform to the requirements of TABLE I. 3.6 Dimensions. 3.6.1 Width. The width of the cloth
26、 shall be as specified by the procuring activity (see 6.2). The width tolerance shall be 1/2 inch. 3.6.2 Lengths. Unless otherwise specified, the lengths of continuous pieces or cuts shall be not less than 100 yards. Shorter cuts may be included in accordance with the following: 75 percent of total
27、order in cuts of 100 yards or more 15 percent of total order in cuts of 25 to 100 yards 10 percent of total order in cuts of 15 to 25 yards Page 4 of 9 Copyright Protected: Do Not Copy!PIA-C-17208B 3.7 Rolls. 3.7.1 Lengths of Classes A, B and C. Unless otherwise specified, rolls shall contain the fo
28、llowing lengths of cloth (see 3.6.2): Class A - 300 to 400 yards Class B - 100 to 200 yards Class C - 100 to 200 yards. 3.7.2 Lengths shorter than 50 yards. Lengths shorter than 50 yards shall be rolled together to the specified roll size and the roll labeled to indicate that it is composed of short
29、er lengths. 3.8 Defects. Defects such as broken picks, broken or missing ends, floats, holes, mispicks, bowed fillings (see 3.8.1), smashes, oil spots, thin areas due to starting or stopping the loom, pickouts, or torn, wavy, or tight selvages will be allowed up to a maximum of 5 defects per 100 yar
30、ds. Definitions are as stated in FED-STD-4, commonly used in commercial practice, or as indicated in 3.8.1. 3.8.1 Bowed filling. A bowed filling is a variation of the filling yarns from the normal, in the form of a single or compound arc. A bowed filling is classified as a defect when the perpendicu
31、lar distance from the highest point on the arc to the straight line chord of the arc, in the plane of the cloth, exceeds 1 inch. The presence of a false bow or filling distortion that can be eliminated within the above requirements by straightening the cloth by hand, when unrolled on a flat surface,
32、 will not be considered a defect. 3.9 Marking of defects. Before material is submitted for Government inspection, the presence of each defect shall be marked by a red string sewn in the selvage opposite the defect or a red plastic marker or tag may be used 3.10 Workmanship. The finished cloth shall
33、be clean, evenly woven, and in accordance with the best commercial practice for textile fabrics and shall contain no defects detrimental to strength, or durability. 3.11 Date of manufacture. The date of manufacture is defined as the date (month and year) of the last manufacturing processing that aff
34、ects the physical characteristics of the cloth. This would not include slitting, inspection or rewinding. 3.12 First article. When specified (see 6.2), a sample representative of the production quality shall be subjected to the first article inspection in accordance with 4.3. 4. QUALITY ASSURANCE PR
35、OVISIONS 4.1 Responsibility 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 order, the contractor may use his own or an
36、y other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to Page 5 of 9 Copyright Protected: Do Not Copy!PIA-C-17208B perform any of the inspections set forth in the specification where su
37、ch inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Conformance inspection. Sampling for inspection shall be performed as specified in this document unless otherwise specified in the contract or order (see 6.2). 4.2.1 Sampling. One representati
38、ve sample 1-1/2 yards long by the full width of the cloth shall be taken from each 1000 yards of cloth or less. Additional samples may be taken, if necessary, to determine uniformity. 4.2.2 Visual examination. The cloth and the materials entering into the manufacture process shall be subjected to vi
39、sual examination for defects which are considered to be detrimental to strength or durability and to ascertain compliance with the material, weave, workmanship, identification marking, and dimensional requirements. 4.2.2.1 Camouflaging. When camouflaging is specified (see 6.1), the cloth shall be ex
40、amined to ascertain that camouflage pattern and colors are in accordance with the samples or instructions supplied by the procuring activity. 4.3 First article. When first article is required (see 3.12 and 6.2, it shall be examined for the defects as specified in TABLE I and paragraphs 4.4.1-4.4.8.
41、4.4 Test procedures. Unless otherwise specified, all tests shall be conducted in accordance with TABLE II. 4.4.1 Permanence of set. Test specimens shall be tested in accordance with PIA-TEST METHOD-503. 4.4.2 Weight. The weight in ounces per square yard of the cloth shall, ordinarily, be determined
42、in accordance with method ASTM D 3776 Option C. When a more accurate determination is necessary, the weight shall be determined in accordance with method ASTM D 3776 Option A. 4.4.3 Breaking strength and elongation. The breaking strength and elongation in both the warp and filling directions shall b
43、e determined by the raveled-strip method in accordance with the test method listed in TABLE II, except that for Class C cloth the specimens shall be raveled to 1/2 inch in width. 4.4.4 Tear resistance. The resistance of tearing across the warp and cross the filling shall be determined in accordance
44、with the test method listed in TABLE II. 4.4.5 Air permeability. Air permeability shall be determined in accordance with the test method listed in TABLE II. 4.4.6 Colorfastness. When camouflaging is specified (see 6.2) the cloth shall be tested in accordance with the test method listed in TABLE II.
45、4.4.7 pH. The pH of the water extract of the finished cloth shall be no less than 5.5 or Page 6 of 9 Copyright Protected: Do Not Copy!PIA-C-17208B more than 9.0 when tested as specified in TABLE II. 4.4.8 Rejection and retest. Failure of any sample of the finished cloth to conform to any one of the
46、requirements of this specification shall be cause for rejection of the lot. Cloth which has been rejected may be reworked or replaced to correct the defects and resubmitted for acceptance. Before resubmitting, full particulars concerning previous rejection and the action taken to correct the defects
47、 found in the original shall be furnished to the procuring activity. Nylon cloth rejected after retest shall not be resubmitted unless specific approval has been obtained from the procuring activity. TABLE II Test methods. Characteristic Requirement Test method Weight: General Precise Para. 4.4.2 an
48、d TABLE I ASTM D 3776 Option C ASTM D 3776 Option A Breaking strength and elongation Para. 4.4.3 and TABLE I ASTM D 5035 (Strip Method) Specimen Type 1R for Class A & B. For Class C use 1/2 inch strip Tear resistance (tongue method) Para.4.4.4 and TABLE I ASTM D 2261 Air permeability Para 4.4.5 and
49、TABLE I ASTM D 737 Yarn identification (materials) Para. 3.1.1 and 3.1.2 ASTM D 276 Permanence of set Para. 3.4, and TABLE I PIA-TEST METHOD-503 Air permeability after permanence of set 3.4.1 and TABLE I PIA-TEST METHOD-503 Thickness after permanence of set 3.4.2 PIA-TEST METHOD-503 Shrinkage after permanence of set 3.4.3 PIA-TEST METHOD-503 Width 3.6.1 ASTM D 3774 Colorfastness to: Sea water 3.3.1, 4.4.6 AATCC 106 pH 3.2, 4.4.7 AATCC 81 Bowed filling 3.8.1 ASTM D 3882 5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall b
