1、 The following commercial specification is 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 to reflect tec
2、hnology and design evolution. CORD, NYLON, CORELESS 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 document covers braided nylon coreless cord. 1.2 Cla
3、ssification. The cord shall be of the type specified (see TABLE I and 6.2). A part or identifying number for the cord shall be as specified in 6.3 and be applicable to TABLE I. After treated cordage shall be of the following class as specified (see 6.2): Class F - Fluorocarbon Impregnated (see 3.8 a
4、nd 6.4). 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 include documents cited in other sections of this specification or recommended for additional information or as examples. While every effo
5、rt 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. 2.2 Government publications. The following Government publication fo
6、rms a part of this document. FEDERAL TRADE COMMISSION (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, N.W. Washington, DC 20580-0001. Electronic co
7、pies may be obtained from http:/www.access.gpo.gov/.) PIA-C-7515E 29 June 2015 Superseding PIA-C-7515D 07 December 2011 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission from Parachute Industry Association. Additional copies m
8、ay be purchased on-line from PIA Specifications and Products: . Copyright Protected: Do Not Copy!PIA-C-7515E Page 2 of 14 2.3 Non-government publications. The following publications form a part of this document. AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for In
9、spection by Attributes (Copies are available online at: www.asq.org or from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203. Electronic copies may also be obtained from www.access.gpo.gov/.) ASTM INTERNATIONAL (ASTM) ASTM D276 - Standard Test Methods for Identifica
10、tion of Fibers in Textiles ASTM D1423 - Standard Test Method for Twist in Yarns by Direct- Counting ASTM D1776 - Standard Practice for Conditioning and Testing Textiles ASTM D1907 - Standard Test Methods for Linear Density of Yarn (Yarn Number) by the Skein Method ASTM G151 - Standard Practice for E
11、xposing Nonmetallic Materials in Accelerated Test Devices That Use Laboratory Light Sources ASTM G155 - Standard Practice for Operating Xenon ARC Light Apparatus for Exposure of Non-Metallic Materials (Copies should be obtained from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19
12、428-2959. Electronic copies may be obtained from www.astm.org.) AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 16.2 - Colorfastness to Light: Carbon-Arc AATCC 16.3 - Colorfastness to Light: Xenon-Arc AATCC 20 - Fiber Analysis: Qualitative AATCC 20A - Fiber Analysis: Quantitativ
13、e AATCC 61 - Colorfastness to Laundering: Accelerated AATCC 81 - pH of the Water-Extract from Wet Processed Textiles AATCC 192 - Weather Resistance of Textiles: Sunshine-Arc Lamp Exposure with and without Wetting AATCC Evaluation Procedures: - 1 Gray Scale for Color Change - 2 Gray Scale for Stainin
14、g - 8 AATCC 9-Step Chromatic Transference Scale - 9 Visual Assessment of Color Difference of Textiles Copyright Protected: Do Not Copy!PIA-C-7515E Page 3 of 14 (Applications for copies of referenced documents should be addressed to AATCC National Headquarters, PO Box 12215, Research Triangle Park, N
15、C 27709-2215. Electronic copies may be obtained from www.aatc.org.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-3000 - PERCENT SOLIDS ADD-ON FOR CORD, NYLON, CLASS F, DETERMINATION OF PIA-TEST METHOD-6004 - LENGTH PER UNIT WEIGHT; CORDAGE PIA-TEST METHOD-6010 - SHRINKAGE OF CORDAGE, BOILING
16、 WATER METHOD; DETERMINATION OF PIA-TEST METHOD-6016 - STRENGTH AND ELONGATION BREAKING OF CORDAGE; NON-SPLICED METHOD (Electronic copies may be obtained from .) 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 an
17、d 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 Standard. The dyed cord shall match the standard for shade and appearance, and s
18、hall, unless otherwise indicated, be equal to or better than the standard with respect to all characteristics for which the standard is referenced (see 6.1). 3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.3 Government an
19、d supply purchases. The requirements specified in 3.12 and 3.14 apply to cord purchased directly by the Government. All other requirements apply to cord purchased by a contractor as a component for an end item and to cord purchased directly by the Government. 3.4 Recycled, recovered, or environmenta
20、lly preferable materials. Recycled, recovered, or environmentally preferable 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. 3.5 Material. The n
21、ylon yarn used in the manufacture of this cord shall be bright, high tenacity, heat and light resistant nylon 6,6 and shall have a melting point of 250 6C when tested as specified in 4.3.1. The yarn or cord shall not be bleached. Testing shall be as specified in 4.3.4. 3.6 Construction and physical
22、requirements. The finished braided cord shall conform to the requirements specified herein and in TABLE I, when tested as specified in 4.3.1 and 4.3.4. The cord shall be braided on braiding machines having the number of carriers specified in TABLE I for the applicable type and the machines shall be
23、regulated to give a two over and two under conventional stitch, i.e. each carrier alternating with the next carrier in the same direction and each strand passing alternately over and under two of the opposite strands. The cord after Copyright Protected: Do Not Copy!PIA-C-7515E Page 4 of 14 braiding
24、shall be heat set in continuous lengths and shall not show more than a 3 percent residual shrinkage when tested as specified in 4.3.4. When cord is specified as Class F, shrinkage shall be measured before finish application. 3.6.1 Twist. The nylon yarns shall have the following twist: Types Ia, IIIa
25、, XI - 1/2 to 1 turn per inch Types I, II, III, IV, V, VI, VII, VIII, X - Minimum of 2 1/2 turns of “Z” twist per inch. TABLE I Physical requirements. Dash number Type Breaking strength, pounds (minimum) Number of carriers Ends per carrier Total ends Basic yarn denier Yarn ply Picks per inch Length
26、per pound, feet (minimum) 2/Elongation, percent (minimum) -1 I 400 16 3 48 210 3 1/11 - 13 330 20 -2 Ia 400 16 2 32 840 1 13 - 14 330 20 -3 II 550 16 3 48 840 1 10 - 12 255 20 -4 III 750 16 6 96 210 3 1/8.5 - 10 150 20 -5 IIIa 800 24 3 72 840 1 10 - 12 175 10 -6 IV 1000 16 6 96 840 1 7 - 9 120 20 -7
27、 V 1500 16 9 144 840 1 6.5 - 8 90 20 -8 VI 2000 16 12 192 840 1 4.5 - 6.5 60 20 -9 VII 2500 16 14 224 840 1 4.5 - 6 45 20 -10 VIII 3000 24 12 288 840 1 5.5 - 7.5 36 20 -11 XI 300 16 7 112 210 1 14 - 15.5 480 20 -12IV 3/1000 16 6 96 840 1 7 - 9 129 20 -13 X 3/650 24 2 48 840 1 14 16 230 20 Notes: 1/T
28、en or less linear yards of ply yarns shall not contain any knots. Knots shall not be closer than 10 yards apart. 2/ A minus tolerance of 10 percent in length will be allowed for dyed cord. 3/ Class F- Fluorocarbon impregnated (see 1.2). 3.6.2 Carrier run-off. In the manufacture of the cord, no more
29、than one carrier shall be allowed to be run off per length of cord as specified in TABLE II for the applicable type. When carrier ends run off, they shall be spliced a minimum distance of 5 inches to a maximum of 10 inches in length. When spliced, the outgoing carrier ends shall be joined with the n
30、ew ends and hand braided for four to five picks and the tail of the splice shall be run into the center of the braided cord. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-C-7515E Page 5 of 14 TABLE II Carrier run-off. Types Distance between carrier run-offs feet (min.) 1
31、/I, Ia, XI, X 100 II, III 50 IIIa, IV 40 V 25 VI 20 VII, VIII 10 Note: 1/ A minus tolerance of 10 percent in length will be allowed on dyed cord. 3.7 Color. Unless otherwise specified (see 6.2), the color of the cord shall be natural. When colored cord is specified, the color shall be attained by pi
32、ece dying. The cord shall be piece dyed under uniform tension at all times during the dyeing process. The dyeing of cord in skeins is prohibited. 3.7.1 Visual shade matching. When evaluated in accordance with 4.5.1, the color of the dyed cord shall match the standard with sources simulating artifici
33、al daylight and shall be a good match to the standard sample under incandescent lamplight. Color matching is required prior to Fluorocarbon application. 3.7.2 Colorfastness to light. PIA has adopted AATCC 16.3 as an acceptable alternative test method to AATCC 16.2 for the testing of Narrow Fabrics u
34、sing Xenon (see TABLE VI). 3.7.3 Colorfastness. When tested as specified in 4.3.4, the dyed cord shall show fastness to light and laundering as follows: Characteristic Rating (minimum) Light (fade) 1/3-4 Laundering: Color Change 1/Staining 2/3-4 3-4 Notes: 1/ Rated using the AATCC Evaluation Procedu
35、re 1, Gray Scale for Color Change 2/Rated using the AATCC Evaluation Procedure 2, Gray Scale for Staining. 3.8 Fluorocarbon finish. The Fluorocarbon is to be evenly distributed throughout the treated cordage (Class F). The solid content for Type IV Class F, Cord, Nylon, Coreless shall be no less tha
36、n 2.0 percent nor more than 5.0 percent by weight when tested as specified in 4.3.4. The solid content for Type X shall be 5 2 percent by weight when tested as specified in 4.3.4. The Fluorocarbon finish shall be applied from a water dispersion and when dried shall form a coating that is evenly depo
37、sited and adhered to on the yarns of the braided cord. The process of applying the Fluorocarbon finish to the cord shall cause no detrimental effect to the physical or chemical properties of the cord. Only approved Fluorocarbon shall be used (see 6.4). 3.9 pH. The pH of the water extract of the fini
38、shed cord shall be no less than 5.5 nor more than 9.0 when tested as specified in 4.3.4. 3.10 Extractable matter. No material shall be added for the purpose of weighing the cord. The water soluble material of the finished cord shall not exceed 2.0 percent when tested as Copyright Protected: Do Not C
39、opy!PIA-C-7515E Page 6 of 14 specified in 4.3.4. 3.11 Resistance to light and heat. The cord shall not lose more than 15.0 percent of its original breaking strength after individual exposures to both light and heat when tested as specified in 4.3.4. 3.12 Put-up. Shall be as specified by the procurin
40、g activity (see 6.2), and wound so that each turn and layer is free from entanglement. A plus tolerance of 10 percent shall be allowed on the length specified. The ends of the cord shall be heat sealed, securely joined, and taped to the cord to prevent fraying. 3.13 Fiber identification. When direct
41、ed in the procurement document or purchase order, each reel/spool of cord shall be labeled or ticketed for fiber content in accordance with the Rules and Regulations under the Textile Fiber Products Identification Act (see 2.2). 3.14 Identification. Each unit pack (spool/reel) of cord, interior and
42、exterior container shall be marked per contract requirements. An additional label as noted shall be attached to the spool if the cord is more than one (1) piece to identify the number and length of pieces of cord per spool. 3.15 Workmanship. The end item shall conform to the quality of product estab
43、lished by this document and the occurrence of defects shall not exceed the applicable acceptable quality levels. 3.16 Date of manufacture (see 6.2). When required by the procuring document the textile manufacturer shall properly identify the age of the textile material by placing a tag on the finish
44、ed goods, or a label on the container, identifying the specification to which the material is manufactured, the lot number and date of manufacture. The date of manufacture is defined as the date (month and year) of the last manufacturing process that affects the physical characteristics of the mater
45、ial. 4. VERIFICATION 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: 1) First article inspection (see 4.2) 2) Conformance inspection (see 4.3). 4.2 First article inspection. The first article submitted in accordance with 3.2 shall be inspecte
46、d as specified in 4.3.1 through 4.3.4 for compliance with design, construction, workmanship and dimensional requirements. 4.3 Conformance inspection. Conformance inspection shall include the examination and the tests of 4.3.1 through 4.4 as applicable. Sampling for inspection shall be performed as s
47、pecified in this document, unless otherwise specified in the contact or order (see 6.2). 4.3.1 Component and material inspection. In accordance with 4.1, components and materials shall be inspected in accordance with all the requirements of referenced specifications, Copyright Protected: Do Not Copy
48、!PIA-C-7515E Page 7 of 14 drawings, and standards, unless otherwise excluded, amended, modified, or qualified in this specification or applicable procurement documents. In addition, inspection shall be performed for the requirements in TABLE III and the sample size shall follow TABLE V. 4.3.2 Compon
49、ent testing. In addition to the quality assurance provisions of the subsidiary specifications, component materials listed in TABLE III shall be tested for the specified characteristics in accordance with the referenced test methods. The lot shall be unacceptable if one or more units fail to meet any requirement specified. All test reports shall contain the individual values utilized in expressing the final result. The sample size shall follow TABLE VI. TABLE III Component tests.
