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. WEBBING, TEXTILE, ARAMID The Parachute Industry Association makes this document available for use by the Industry and Government organizations that wish to apply this specification to their products. 1. SCOPE 1.1 Scope. This specification covers 14 types of aromatic pol
3、yamide webbing as specified in TABLE I. 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 o
4、r 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. 2.2 Government publications. 2.2.1 Go
5、vernment publications. The following Government publication forms 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 Penn
6、sylvania Avenue, N.W. Washington, DC 20580-0001. Electronic copies may also be obtained from www.access.gpo.gov/.) PIA-W-38283C 21 September 2015 Superseding PIA-W-38283B 01 December 2011 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written
7、 permission from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyright Protected: Do Not Copy! PIA-W-38283C Page 2 of 18 2.3 Non-government publications. The following documents form a part of this document. AMERICAN ASSOCIATI
8、ON OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 20 - Fiber Analysis: Qualitative (Application for copies should 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 QUALI
9、TY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies are available online at www.asq.org or from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL (ASTM) ASTM D1423 - Standard Test Method for Twist in Yarns
10、 by Direct-Counting ASTM D1776 - Standard Practice for Conditioning and Testing Textiles ASTM D1777 - Standard Test Method for Thickness of Textile Materials ASTM D1907 - Standard Test Method for Linear Density of Yarn (Yarn Number) by Skein Method ASTM D3774 - Standard Test Method for Width of Text
11、ile Fabric ASTM D3775 - Standard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabric (Application for copies should be addressed to ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Electronic copies may be obtained from www.astm.org.) PARACHUTE INDUSTRY AS
12、SOCIATION (PIA) PIA-TEST METHOD-4108 - STRENGTH AND ELONGATION, BREAKING; TEXTILE WEBBING, TAPE AND BRAIDED ITEMS (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 and the
13、 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 First article. When specified (see 6.1), a sample representative of the production qu
14、ality shall be submitted for first article inspection in accordance with 4.2. Copyright Protected: Do Not Copy! PIA-W-38283C Page 3 of 18 3.2 Materials. 3.2.1 Yarn. The yarn shall be a nonmelting, aromatic polyamide. The yarn shall not char at a temperature less than 675F, when tested as specified i
15、n 4.3.1.1. 3.2.2 Twist. The final ply of the warp and filling yarns shall have a minimum of 2.5 tpi. The denier and number of single yarns specified in TABLE I shall be twisted together (plied) in one operation. 3.3 Construction and physical properties. The finished webbing shall conform to TABLE I
16、and 3.3.1 through 3.6. 3.3.1 Weave. 3.3.1.1 Types I, II, IIa, IV, VII, XIII and XIV. The weave for Types I, II, IIa, IV, VII, XIII and XIV shall be a two up two down herringbone twill with one reversal at the center of the webbing. 3.3.1.2 Types III, V and VI. The weave for Types III, V and VI shall
17、 be a double plain weave with a single filling. Separate binder warp ends shall weave two up and two down, one end as one. All other warp yarns shall weave two ends as one except that the edge warp yarns shall weave one end as one not exceeding eight ends on one selvage and nine on the other selvage
18、. 3.3.1.3 Types VIII, IX and X. The weave for Types VIII, IX, and X shall be a five up, one down, one up, five down herringbone twill with one reversal at the center of the webbing. The weave is shown in FIGURE 1. 3.3.1.4 Type XI. The weave for Type XI shall be as shown in FIGURE 2. 3.3.1.5 Type XII
19、. The weave for Type XII shall be as shown in FIGURE 3. 3.3.1.6 Type XV. The weave for Type XV shall be as shown in FIGURE 4. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy! PIA-W-38283C Page 4 of 18 TABLE I Construction and physical properties. Type Width (inches) Thickness
20、(inches) Weight (maximum) (oz./linear yard) Breaking strength (lb.)(minimum) Ends in warp (minimum) face and back Binder Total I 9/16 1/32 .025-.040 0.28 500 70 - 70 II 1 1/32 .015-.030 0.40 600 80 - 80 IIa 3/4 1/32 .035-.045 .045 600 180 - 180 III 1 23/32 1/16 .080-.110 2.0 5,500 223 27 250 IV 1 23
21、/32 1/16 .055-.075 1.75 3,600 154 - 154 V 3 1/32 +1/8 .070-.110 4.50 9,000 359 44 403 VI 1 23/32 +1/16 .015-.030 0.70 1,200 146 - 146 VII 1 23/32 +1/16 .145-.175 4.35 8,700 241 29 259 VIII 1 23/32 +1/16 .090-.120 3.0 6,500 272 - 272 IX 1 +1/16 .140-.175 2.70 6,000 252 - 252 X 1 3/4 +1/16 .140-.175 4
22、.30 10,000 282 - 282 XI 1 +1/16 .220-.260 4. 10 9,000 184 15 199 XII 1 23/32 +1/16 .09-.12 3.4 7,300 305 - 305 XIII 1 1/4 +1/32 .015-.030 0.50 800 106 - 106 XIV 1 +1/32 .060-.080 1.20 2,500 104 - 192 XV 1 1/2 +1/16 .045-.065 1.35 1,700 143 34 177 (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Prote
23、cted: Do Not Copy! PIA-W-38283C Page 5 of 18 TABLE I Construction and physical properties (contd.). Type Picks per inch (minimum) Number of yarns for final plied yarns (minimum) Yarn denier Warp Binder Filling Warp Binder Filling I 34 4 - 2 200 - 200 II 34 4 - 2 200 - 200 IIa 34 4 - 2 200 - 200 III
24、20 2 1 2 1,200 1,200 1,200 IV 16 2 - 1 1,200 - 1,200 V 22 2 1 2 1,200 1,200 1,200 VI 18 3 1 2 1,200 1,200 1,200 VII 34 4 - 2 200 - 200 VIII 17 2 - 2 1,200 - 1,200 IX 17 2 - 2 1,200 - 1,200 X 17 3 - 2 1,200 - 1,200 XI 18 4 1 2 1,200 1,200 1,200 XII 7 2 - 2 1,200 - 1,200 XIII 34 4 - 2 200 - 200 XIV 14
25、 2 - 1 1,200 - 1,200 XV 47 1 1 1 1,200 1,200 1,200 (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy! PIA-W-38283C Page 6 of 18 3.3.2 Aging. All types of webbing shall be oven aged and shall not lose more than 15 percent of the original breaking strength, when tested in accordan
26、ce with TABLE V. 3.3.3 Resin treatment. Types I, III, IV and VIII webbings shall be polyvinyl butyral plasticized with butyl ricinoleate suitably applied by water dispersion, dried and cured to form a firmly adherent and evenly distributed deposit or coating on the yarns of the webbing. The curing o
27、f the resin shall be conducted within the temperature range of 240-360F as specified in TABLE V. 3.3.3.1 Extractable matter. All types of resin treated webbing shall contain a maximum of 8.5 percent by weight of matter extractable in methyl ethyl-ketone, when tested as specified in 4.6.2.1. 3.3.4 Re
28、sistance to abrasion (Types I, IV, VIII and XII). After resin treated and when abraded, Types I and IV webbing shall retain not less than 75 percent of the original breaking strength and Types VIII and XII shall retain not less than 85 percent of the original breaking strength, when tested in accord
29、ance with 4.6.3. 3.4 Color. Unless otherwise specified, the color of the webbing shall be Olive Green 106. 3.4.1 Visual shade matching. When evaluated in accordance with 4.6.4, the color of the dyed webbing shall match the standard with sources simulating artificial daylight and shall be a good matc
30、h to the standard under incandescent lamplight. 3.5 Length. Unless otherwise specified by the procuring activity, each roll of webbing shall contain 90 to 110 yards. No roll shall contain more than 3 pieces, and no piece shall be less than 10 yards in length. 3.6 Identification of product. Each roll
31、 shall have an identification ticket attached with not finer than 5-ply cotton string doubled to not less than 6 inches long. The tickets shall be made of paperboard not less than 0.015 inch in thickness and the color shall be manila or light in intensity to permit easy reading of printed, stamped o
32、r typed markings. The use of handwritten entries is prohibited. The ticket shall have clipped corners at the end where a reinforcing patch (with or without a metal eyelet) is firmly affixed for attaching the tying string. The ticket shall be legibly printed with water insoluble ink with the followin
33、g information: - WEBBING, TEXTILE, ARAMID, TUBULAR - Type, Class and specification number - Width - Gross yardage - Number of pieces - Date of manufacturer (month and year) - Name of contractor. 3.7 Fiber identification. Each roll of webbing shall be labeled, ticketed or invoiced for fiber content i
34、n accordance with the Textile Fiber Products Identification Act per 16 CFR 303. Copyright Protected: Do Not Copy! PIA-W-38283C Page 7 of 18 3.8 Workmanship. The finished webbing shall be clean, evenly woven and shall conform to the quality and grade of product established by this specification. The
35、occurrence of defects shall not exceed the levels set by the Acceptable Quality Limit (AQL). 3.9 Date of manufacturer (see 6.1). When required by the procurement document, the textile manufacturer shall properly identify the age of the textile materials by placing a tag on the finished goods, or lab
36、el on the containers, identifying the specification to which the material is manufactured, the lot number and the 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 material. 4. VERIF
37、ICATION 4.1 Classification of inspection. The inspection of the webbing shall be classified as follows: a. First article inspection (see 4.2) b. Conformance inspection (see 4.3). 4.2 First article inspection. The first article submitted in accordance with 3.1 shall be inspected as specified in 4.3 t
38、hrough 4.6.3 for compliance with design, construction, workmanship and dimensional requirements. 4.3 Conformance inspection. Conformance inspection shall include examination of 4.3.1. through 4.6.3 as applicable. Sampling for inspection shall be performed as specified in this document unless otherwi
39、se specified in the contract or order (see 6.1). 4.3.1 Component and material inspection. In accordance with 4.1, components and materials shall be inspected in accordance with the requirements of referenced documents unless otherwise excluded, amended, modified or qualified in this document or appl
40、icable purchase document. 4.3.1.1 Component testing. In addition to the quality assurance provisions of the subsidiary specifications, component materials listed in TABLE II shall be tested for the specified characteristics, in accordance with the referenced test methods. The sample size and accepta
41、nce number shall be shown in TABLE IV. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy! PIA-W-38283C Page 8 of 18 TABLE II Testing of components. Characteristics Requirement reference Test method Yarn: Aromatic polyamide 3.2.1 1/ Denier TABLE I ASTM D1907 1/ Carbonization 3.2.
42、1 AATCC-20 Ply TABLE I Visual Twist 2/ 3.2.2 ASTM D1423 Notes: 1/ Denier shall be calculated as follows and shall be reported to the nearest whole number: Denier = Weight in grams x 9840 Length in yards 2/ The suppliers Certificate of Compliance showing that the yarn identified in 6.2 was used may b
43、e submitted in lieu of test method. If a determination is made, the specimen shall be taken from the woven webbing. 4.3.2 Certificates of Compliance. When Certificates of Compliance are submitted, the procuring activity reserves the right to inspect such items to determine the validity of the certif
44、ication. 4.4 Carbonization. 4.4.1 Apparatus. A suitable melting point apparatus meeting test method requirements shall be used to determine the carbonization point of the yarns. 4.4.2 Procedure. A sufficient number of fibers shall be removed from the yarn sample for observation of carbonization. The
45、 temperature at which the yarn begins to stiffen or char shall be considered the end point of the test. 4.5 End item examination. 4.5.1 Yarn-by-yard examination. The required yardage of each piece shall be inspected on both sides and visual defects classified as listed in TABLE III. All defects foun
46、d shall be counted, regardless of their proximity each other, except where two or more defects represent a single local condition of the webbing, in which case only the more serious defect shall be counted. A continuous defect shall be counted as one defect for each yard or fraction thereof in which
47、 it occurs. The sample unit shall be 1 linear yard. Acceptance sampling shall be determined by using Inspection III with Acceptance Quality Limit (AQL) of 0.15 for major defects and 1.5 for total defects (major and minor combined). For critical defects, the lot shall be rejected when one or more cri
48、tical defects are found in a sample size. The number of rolls from the sample yardage is to be selected in accordance with TABLE IV. The sample yardage shall be apportioned equally among the selected rolls. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy! PIA-W-38283C Page 9 o
49、f 18 TABLE III Classification of defects. Defect Description 1/ Major Minor Abrasion marks Resulting in rupture of yarns, or in nap sufficient to obscure the identity of any yarn exceeding 10 percent of width or 1 inch in length 101 Broken or missing end Two or more regardless of length or a single end exceeding 6 inches in length 102 Single end under 6 inches but exceeding 1/4 inch 201 Broken or missing pick Two or more regardless of extent Note: The filling tie-in or joining shall not be construed as a defect of any nature 103 Coarse o
