1、BRITISH STANDARD AEROSPACE SERIES BS 3F 126:2002 35 g/m 2nylon parachute fabric ICS 49.025.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 3F 126:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee,
2、was published under the authority of the Standards Policy and Strategy Committee on 22 May 2002 BSI 22 May 2002 First published July 1980 Second edition September 1990 Third edition May 2002 The following BSI references relate to the work on this British Standard: Committee reference ACE/54 Draft fo
3、r comment 00/706578 DC ISBN 0 580 37921 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/54, Wide fabrics and coated fabrics for aerospace purposes, upon which the following bodies were represented: British Rubber Ma
4、nufacturers Association Ltd. Ministry of Defence Society of British Aerospace Companies Ltd. Textile Finishers Association Amendments issued since publication Amd. No. Date CommentsBS 3F 126:2002 BSI 22 May 2002 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Nor
5、mative references 1 3T e r m s a n d d e f i n i t i o n s 1 4 General requirements 1 5Y a r n 2 6 Manufacture 3 7 Finish 3 8 Construction and properties of finished fabric 4 9 Permeability 4 10 Water extractable matter 4 11 Identification 4 Annex A (informative) Information to be supplied by the pu
6、rchaser 5 Annex B (normative) Heat ageing test 5 Bibliography 7 Table 1 General requirements (given in BS F 100) 2 Table 2 Yarn twist 2 Table 3 Construction and properties of finished fabric 4 Table 4 Permeability requirements 4BS 3F 126:2002 ii BSI 22 May 2002 Foreword This British Standard, prepar
7、ed by Technical Committee ACE/54, Wide fabrics and coated fabrics for aerospace purposes, is one of a series of specifications for textiles of a quality suitable for aerospace purposes, and is a revision of BS 2F 126:1990, which is withdrawn. This revision updates the standard, introduces intermingl
8、ed yarns and deletes the imperial units for air permeability. Quality requirements as defined in the latest edition of BS F 100 are also included, as are details of information to be supplied by the purchaser. NOTE The latest revision of an aerospace series standard is indicated by a prefix number.
9、Annex A is informative and Annex B is normative. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal oblig
10、ations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 3F 126:2002 BSI 22 May 2002 1 1 Scope This British Standard specifi
11、es the requirements for a range of nylon fabrics, of nominal mass per unit area of 35 g/m 2for aerospace purposes, primarily for parachute canopies. NOTE The information to be supplied by the purchaser in the contract or order should be as listed in Annex A. 2 Normative references The following refe
12、renced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS F 100, Procedure for inspection and testing of textiles for aero
13、space purposes. BS EN ISO 7500-1:1999, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system. BS EN ISO 2061:1996, Textiles Determination of twist in yarns Direct counting method. BS
14、 EN ISO 2062:1995, Textiles Yarns from packages Determination of single-end breaking force and elongation at break. 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply. 3.1 heat ageing breaking strength lost after a specified heat treatment NO
15、TE This is usually expressed as a percentage of the original strength. 3.2 intermingle impart cohesion to the filament bundle of a multifilament yarn by entwining the filaments 4 General requirements 4.1 In addition to the requirements specified in Clause 4 to Clause 11 of this standard, the require
16、ments and tests of the latest edition of BS F 100 as specified in Table 1 shall apply. 4.2 The breaking force and elongation at break of the yarn (see 5.2) shall be determined in accordance with BS EN ISO 2062:1995, Method A or B, except that the number of packages to be tested shall be a minimum of
17、 five, and the number of tests required to produce a package mean shall be five. 4.3 The yarn twist shall be determined in accordance with BS EN ISO 2061, except that the number of packages to be tested shall be a minimum of five, and the number of tests required to produce a package mean shall be f
18、ive.BS 3F 126:2002 2 BSI 22 May 2002 Table 1 General requirements (given in BS F 100) 5 Yarn 5.1 Type The fabric shall be woven from continuous-filament, round cross-section, high-tenacity nylon 6.6 yarn manufactured from bright, heat-resistant polymer. 5.2 Properties 5.2.1 The yarn prior to twistin
19、g shall have the following properties: a) a nominal linear density of 33 dtex 1)and contain 10 filaments; b) a mean breaking strength per package of not less than 170 cN, and a mean elongation at break per package not exceeding 30 %. 5.2.2 The yarn prior to twisting shall not lose more than 20 % of
20、its original strength, when tested in accordance with the heat ageing test described in Annex B. 5.2.3 Yarn twist shall comply with the values stated in Table 2. Table 2 Yarn twist Section of BS F 100 Section title Requirements and tests in BS F 100 1 General All requirements 2 Quality requirements
21、Requirements for the manufacture of wide fabrics Requirements for dyed textiles Requirements for dimensions and tolerances, general and wide fabrics Requirements for freedom from corrosive impurities (see also section 4) Requirements for freedom from faults in wide fabrics 3 Physical tests Test for
22、the determination of the number of threads in woven fabrics Test for the determination of mass of wide fabrics Tests for breaking strength and extension under force of wide fabrics Test for tearing strength Test for air permeability of parachute fabrics 4 Chemical tests Test for water extractable ma
23、tter If required by section 2 test for pH value of aqueous extract test for water-soluble chloride test for water-soluble sulfate 1) 1t e x = 1 0 6kg/m. Fabric designation Yarn twist Warp Weft turns/m turns/m 220 Intermingled Intermingled 254 200 20 Intermingled 1312 200 20 Intermingled 1316 200 20
24、IntermingledBS 3F 126:2002 BSI 22 May 2002 3 6 Manufacture 6.1 Fabric 1316 shall be plain weave. Other fabrics shall be plain weave with a rip-stop pattern as specified in 6.2 or 6.3. 6.2 Fabric 220 shall have ribs spaced at constant pitch. These shall be formed by two ends in the warp and two picks
25、 in the weft weaving as double threads. There shall be 14 single ends or picks respectively between the ribs. 6.3 Fabrics 254 and 1312 shall have ribs spaced at constant pitch. These shall be formed by four ends in the warp and four picks in the weft weaving as two adjacent double threads. There sha
26、ll be 14 single ends or picks respectively between the ribs. 7 Finish 7.1 General 7.1.1 All fabrics shall be scoured. 7.1.2 Fabric 220 shall be supplied either: a) undyed, subjected to a silicone treatment (see 7.4) and calendered on both sides; or b) dyed (see 7.2), subjected to a silicone treatmen
27、t (see 7.4) and calendered on both sides. 7.1.3 Fabric 254 shall be supplied: a) undyed and calendered on both sides; or b) undyed, subjected to a silicone treatment (see 7.4) and calendered on both sides; or c) dyed (see 7.2) and calendered on both sides; or d) dyed (see 7.2) subjected to a silicon
28、e treatment (see 7.4) and calendered on both sides. 7.1.4 Fabric 1312 shall not be pressed or calendered and shall be supplied either: a) undyed and subjected to a silicone treatment (see 7.4); or b) dyed (see 7.2) and subjected to a silicone treatment (see 7.4). 7.1.5 Fabric 1316 shall not be press
29、ed or calendered and shall be supplied either: a) undyed; or b) dyed (see 7.2). 7.2 Dyeing Where dyeing is required, the colour of the fabric shall be specified either by reference to a British Standard or otherwise by pattern. NOTE 1 An appropriate British Standard would be BS 381C:1996. NOTE 2 The
30、 requirement for dyed fabric should be specified by the purchaser in the contract or order (see Annex A). 7.3 Calendering Where calendering is required, the method of calendering shall be at the discretion of the finisher provided that the finished fabric complies with Table 3 and Clause 9, and has
31、a similar appearance on both faces. 7.4 Silicone treatment Where silicone treatment is required, the fabric shall be treated with a non-ionic silicone emulsion, of viscosity nominally 10 000 cSt 2)and containing 35 % silicone, to give an added nominal mass of 2 % silicone on fabric mass per unit are
32、a. NOTE The requirement for silicone treatment should be stated by the purchaser on the contract or order (see Annex A). 2) 1S t = 1 0 4m 2 /s.BS 3F 126:2002 4 BSI 22 May 2002 8 Construction and properties of finished fabric 8.1 When tested in accordance with 4.1, the fabric in the finished state sh
33、all comply with the requirements of Table 3. 8.2 Unless otherwise stated by the purchaser in the contract or order (see Annex A): the minimum usable width of the finished fabric 220 shall be 1 200 mm; the minimum usable width of the finished fabric 254 shall be 940 mm and; the minimum usable width o
34、f the finished fabrics 1312 and 1316 shall be 920 mm. NOTE The fabric may be woven in multiple widths with leno weave selvedges, and slit to yield finished fabric of the minimum usable width stipulated. Table 3 Construction and properties of finished fabric 9 Permeability When tested in accordance w
35、ith 4.1, each piece of finished fabric shall have a mean permeability as shown in Table 4. NOTE It is most desirable that the mean permeability of the fabric should be as near as possible to the relevant mean figure shown in Table 4, and that the variation between the individual readings should be a
36、s low as possible. Table 4 Permeability requirements 10 Water extractable matter When tested in accordance with 4.1, the amount of water extractable matter in the finished fabric shall not exceed 1.0 % by mass. 11 Identification The fabric shall be identified for ordering purposes by the number and
37、date of this British Standard, i.e. BS 3F 126:2002 3) , together with the relevant designation given in Table 3, if required dyed, the colour, and the finish. NOTE This identification may be codified, e.g. fabric 254 required dyed olive drab and silicone treated may be identified as BS 3F 126:2002/2
38、54/BS 381C:1996 No. 298/silicone treated. Designation Minimum number of threads per centimetre a Maximum mass per unit area Minimum average breaking strength Minimum breaking extension Minimum tearing strength b g/m 2 N/50 mm % N Warp Weft Warp Weft Warp Weft Warp Weft 220 48 48 38 400 400 25 25 40
39、40 254 48 48 38 400 400 22 22 30 30 1312 48 48 38 420 420 22 22 40 40 1316 43 39 34 350 350 22 22 22 27 a Calculated from the number of threads in a measured length of not less than 20 mm. b Warp tear means tearing across warp threads. Weft tear means tearing across weft threads. Fabric Mean permeab
40、ility a 220 350 max. 254 915 max. 1312 4 000 600 1316 7 000 920 a Mean permeability readings refer to l/(m 2 s), i.e. volume of air in litres passing through 1 m 2of fabric in 1 s at 2.5 kN/m 2(25.4 cm water gauge). 3)Marking BS 3F 126:2002 on or in relation to a product represents a manufacturers d
41、eclaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third-party certification
42、 of conformity, which may also be desirable.BS 3F 126:2002 BSI 22 May 2002 5 Annex A (informative) Information to be supplied by the purchaser The following information should be stated by the purchaser in the contract or order: a) the number of this British Standard, i.e. BS 3F 126; b) the fabric d
43、esignation from Table 3; c) whether the fabric is required dyed or undyed (see Clause 7); d) whether the fabric is to be subjected to a silicone treatment (see Clause 7); e) the minimum usable width required (see Clause 8). Annex B (normative) Heat ageing test B.1 Principle Specimens of yarn are hea
44、ted in an oven for a specified time and temperature. The specimens are then removed from the oven, conditioned, and the breaking strength is determined. The strength lost during treatment is expressed as a percentage of the unheated yarn breaking strength as determined from unheated comparison speci
45、mens. B.2 Apparatus B.2.1 Tensile testing machine, to BS EN ISO 7500-1:1999 (Class 1 or better) and fitted with the appropriate load cell and clamps. B.2.2 Laboratory oven, of suitable size, capable of providing temperatures within the range 150 C to 250 C with control of the selected temperature to
46、 2 C. NOTE To ensure uniform temperature distribution the oven should preferably be fitted with a fan. It is important that the oven regains the set temperature within 3 min of shutting the door, without any appreciable overshoot (not greater than 2 C). B.2.3 Suitable timer. B.2.4 Wrap wheel, of 1 m
47、 circumference. B.2.5 Heat-resistant gloves. B.2.6 Means of suspending the yarn samples in the oven, e.g. a frame or metal rod fitted with bulldog clips. B.2.7 Tie-on labels. B.3 Conditioning and testing atmosphere Condition all samples and carry out all tests in the standard atmosphere for testing
48、defined in BS F 100. B.4 Test specimens B.4.1 Unwrap and discard the surface layers from each package to be tested. B.4.2 Using the wrap wheel, run off from each package sufficient yarn to carry out five tests. B.4.3 Tie the free ends together to form a skein, release the retractable arm of the wrap
49、 wheel, and remove the skein, taking care not to damage the yarn. B.4.4 Double the skein and attach a label noting the specimen reference. B.4.5 Repeat B.4.2, B.4.3 and B.4.4 for the unheated samples and place in the conditioning atmosphere while the first samples are heated. B.5 Procedure B.5.1 Set the oven temperature to (180 2) C. B.5.2 For the yarn that is to be heated, suspend each folded skein from a bulldog clip on the rod, or from a hook on the frame.
