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, NYLON, LOCKING LOOP 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 one type of nyl
3、on webbing furnished in cut pieces with integrally woven loops. 1.2 Classification. The webbing furnished in cut pieces shall be of the following classes, as specified (see 6.2): a. Class 1 - 2 3/4 1/8 inch between outside loop ends (see FIGURE 1) b. Class 2 - 3 3/4 1/8 inch between outside loop end
4、s (see FIGURE 1) c. Class 3 - 6 3/16 inch between outside loop ends (see FIGURE 1). 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
5、 or 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 in Sections 3 and 4 of this specification, whether or not they are l
6、isted. 2.2 Government publications. 2.2.1 Government 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 PIA-W-9049C 29 June 2015 Superseding PIA-W-9049
7、B 21 October 2011 DISTRIBUTION STATEMENT: All Rights 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!PI
8、A-W-9049C Page 2 of 16 (Copies are available online at: www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W. Washington, DC 20580-0001. Electronic copies may be obtained from http:/www.access.gpo.gov/.) 2.3 Non-Government publications. The following documents form a part o
9、f this document. 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 from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL (ASTM) ASTM D14
10、23 - 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 D3774 - Standard Test Method for Width of Textile Fabric ASTM D37
11、75 - Standard Test Method for Warp (End) Count and Filling (Pick) Count of Woven Fabric ASTM D3776 - Standard Test Methods for Mass Per Unit Area (Weight) of Fabric ASTM D5035 - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method) ASTM G151 - Standard Practice for
12、 Exposing 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 (Application for copies should be addressed to ASTM International, 100 Barr Harbor Drive, West Co
13、nshohocken, PA 19428-2959. 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 Anal
14、ysis: Quantitative AATCC 81 - pH of the Water-Extract from Wet Processed Textiles Copyright Protected: Do Not Copy!PIA-W-9049C Page 3 of 16 AATCC Evaluation Procedures: - 1 Gray Scale for Color Change - 2 Gray Scale for Staining - 8 AATCC 9-Step Chromatic Transference Scale - 9 Visual Assessment of
15、Color Difference of Textiles (Applications for copies should be addressed to AATCC National Headquarters, PO Box 12215, Research Triangle Park, NC 27709-2215. Electronic copies may be obtained from www.aatc.org.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-4108 - STRENGTH AND ELONGATION, BR
16、EAKING; 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 references cited herein, the text of this document takes preceden
17、ce. Nothing in this document, however, supersedes applicable laws and regulation unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified in (see 6.1), a sample representative of the production quality shall be submitted for first article inspection in accorda
18、nce with 4.3. 3.2 Design and construction. 3.2.1 Physical properties. The finished webbing shall conform to TABLE I and 3.1 through 3.6. (THIS SPACE LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-W-9049C Page 4 of 16 TABLE I Physical properties of the finished webbing. Note:1/ No bre
19、ak on any one specimen shall be lower than the minimum specified. 3.2.2 Yarn. The yarn shall be a bright, high tenacity, light and heat resistant polyamide (see 3.2.1) prepared from hexamethylene diamine and adipic acid or its derivates. It shall have a minimum melting point of 472F (244.4C). The ya
20、rn shall not be bleached in any manner or in any subsequent process. 3.2.3 Weave. The weave shall be 2/2 twill for the body between the loops and 1/1 for the loop sections as shown in FIGURE 1. 3.2.3.1 Spacing of loops. For all classes the loops, in pairs, shall be as shown in FIGURE 2. 3.2.3.2 Form
21、ation of loops. By adjustment of the weaving mechanism, the loops shall be formed by reversal of the filling yarns at the center of the webbing in order to enclose each half of the total warp ends to form the sides of the loop. 3.3 Functional characteristics. The webbing shall meet the requirements
22、of TABLE I when tested as specified in Section 4. 3.3.1 Resistance to light and heat. The webbing shall lose no more than 25 percent of its original breaking strength when tested, as specified in Section 4, for resistance to heat and to light. 3.3.2 Non-fibrous materials. Residual size, finish oils,
23、 or other nonfibrous materials shall not exceed 2 percent. 3.3.3 pH. The pH value of the water extract of the finished webbing shall be no less than 5.5 or more than 9.0 when tested as specified in 4.4. 3.3.4 Finishing age. Dyestuffs, detergents, or other chemicals or finishing agents used in the ma
24、nufacture of the webbing shall not cause deterioration under normal warehouse storage Characteristic Requirement Filling, (minimum): Warp (minimum) Filling (minimum) 1 2 Yarn twist, turns per inch: Warp, (minimum) 4-Z Filling, (minimum) 2.5-S Breaking strength, lb. (minimum) 1/400 Elongation, percen
25、t (minimum) 20 Picks per inch, (minimum) 60 Lengths of loop (inches) 1/4 1/16 Loop strength, 1b. (minimum) 1/185 Warp ends, total (minimum) 180 Weight, oz. per linear yd. (maximum) 0.22 Width, inches 1/4 1/16 Copyright Protected: Do Not Copy!PIA-W-9049C Page 5 of 16 conditions, nor cause dermatitis
26、on prolonged intimate skin contact, nor increase the flammability of the webbing. 3.4 Color. The color of the webbing and its referenced standard shall be as specified by the procuring activity or order. Unless otherwise specified (see 6.1), the webbing shall be furnished in the natural color. 3.4.1
27、 Dyeing. When colored webbing is specified, the webbing shall be dyed with acetate or acid-type dyes. Metallized or chrome dyes shall not be used. 3.4.2 Visual shade matching. When evaluated in accordance with 4.7.5, the color of the dyed webbing shall match the standard with sources simulating arti
28、ficial daylight and shall be a good match to the standard under incandescent lamplight. 3.4.3 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 using Xenon (see TABLE II). 3.5 Put-up. The webbing shall be furni
29、shed in cut pieces, the dimensions of which shall be specified by class number (see 1.2). 3.5.1 Cutting of pieces for put-up. Each piece shall be prepared by cutting the solid weave webbing with a very hot knife or wire. The seared tail end shall not exceed the thickness of the webbing by more than
30、0.010 inch. The fused portion measured along the length of the tail shall be no greater than 1/32 inch. Notes: 1) Dimensions shown are with loops flat (see FIGURE 2). 2) Dimensions are in inches. 3.6 Identification of product. 3.6.1 Identification label. Each box shall have a label or tag marked wit
31、h the following information and attached in such a manner as to remain in place until all the cut pieces have been removed. The color of the label shall be light in intensity to permit easy reading of printed, stamped, or typed markings. The use of handwritten entries is prohibited. The label shall
32、be legibly printed with water-insoluble ink with the following information: a. Stock number b. Nomenclature c. Specification PIA-W-9049 d. Color e. Actual pieces f. Contract number and date of manufacture (month and year) g. Suppliers name h. Name of contracting agency. Class A 1 2 3/4 1/8 2 3 3/4 1
33、/8 3 6 3/16 Copyright Protected: Do Not Copy!PIA-W-9049C Page 6 of 16 3.6.2 Fiber identification. Each box of webbing shall be labeled, ticketed, or invoiced for fiber content in accordance with the Textile Fiber Products Identification Act. 3.7 Workmanship. The finished webbing shall be clean, even
34、ly woven, and shall conform to the quality and grade of product established by this specification. The occurrence of defects shall not exceed the levels set by Acceptable Quality Limit (AQL). 3.8 Date of manufacture (see 6.1.). When required by the procuring document, the textile manufacturer shall
35、properly identify the age of the textile material by placing a tag on the finished 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 l
36、ast manufacturing process that affects the physical characteristics of the material. 4. VERIFICATION 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 (examinations and tes
37、ts) 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 performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to
38、perform any of the inspections set forth in the specification where such inspections are deemed necessary to ensure that the supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet all requirements of Sections 3 and 5. The inspection set for
39、th in this specification shall become a part of the contractors overall 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 f
40、or acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements; however, this does not authorize submission of known defective material, either indicated or actual, nor does it c
41、ommit the Government to accept defective material. 4.1.2 Certificate of Compliance. Where Certificates of Compliance are submitted, the Government reserves the right to check test such items to determine the validity of the certification. 4.2 Classification of inspection. The classification inspecti
42、on requirements specified herein are as follows: 1. First article inspection (see 4.3) 2. Conformance inspection (see 4.5). 4.3 First article inspection. Sampling for inspection shall be performed as specified in this document unless otherwise specified in the contract or order (see 6.1). Copyright
43、Protected: Do Not Copy!PIA-W-9049C Page 7 of 16 4.4 Inspection conditions. Unless otherwise specified, all tests shall be performed under standard conditions to ASTM D1776. Except for loop strength, the physical and chemical values specified in Section 3 apply to the average of the determinations ma
44、de on the sample for test purposes as specified in the applicable test methods of TABLE II. For loop strength, the lots shall be rejected if any single determination is lower than the required minimum. 4.5 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the te
45、sts of 4.6 through 4.7.4 as applicable. Sampling for inspection shall be performed as specified in this document, unless otherwise specified in the contract or order (see 6.1). 4.6. Dually conformance inspection. The quality conformance inspection shall consist of sampling plans A, B, C and D. 4.6.1
46、 Sampling plan A (by yard). Sample size shall be 10 yards taken from each 3000 yards, or fraction thereof. A minimum of three samples (30 yards) shall be taken from lots containing 6000 yards, or fraction thereof. Each sample shall be subjected to the following tests: Acidity, breaking strength and
47、elongation, melting point of nylon, nonfibrous materials, picks per inch, total ends, weight and width as specified in TABLE II. 4.6.2 Sampling plan B (by pieces). Sample size for the out webbing shall be one box taken from each 250 boxes, or fraction thereof, of each class of cut pieces. Ten pieces
48、 shall be withdrawn at random from each box: five pieces shall be subjected to the loop strength test and five pieces to the out piece dimension test, which includes thickness of seared ends. 4.6.3 Sampling plan C (piece-by-piece examination). The sample unit for this examination shall be one piece.
49、 Acceptance sampling plan shall be determined by using Inspection Level III with an Acceptance Quality Limit (AQL) of 2.5 minor defects. The lot size shall be expressed in units of pieces. An approximately equal number of pieces shall be examined from each box selected for sampling. The number of sample boxes shall be computed as follows: Number of boxes = Pieces in sample 50 The required number of pieces shall be inspected and visual end item defects classified as listed in TABLE II
