1、BRITISH STANDARD AEROSPACE SERIES BS 5F 118:2002 50 g/m 2nylon parachute fabric ICS 49.025.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 5F 118:2002 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 February 1964 Second edition August 1978 Third edition September 1980 Fourth edition September 1990 Fifth edition May 2002 The following BSI references relate to the work o
3、n this British Standard: Committee reference ACE/54 Draft for comment 00/706576 DC ISBN 0 580 37917 5 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 wh
4、ich the following bodies were represented: British Rubber Manufacturers Association Ltd. Ministry of Defence Society of British Aerospace Companies Ltd. Textile Finishers Association Amendments issued since publication Amd. No. Date CommentsBS 5F 118:2002 BSI 22 May 2002 i Contents Page Committees r
5、esponsible Inside front cover Foreword ii 1S c o p e 1 2 Normative 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
6、4 Annex A (informative) Information to be supplied by the purchaser 5 Annex B (normative) Heat ageing test 5 Bibliography 7 Table 1 General requirements (given in BS F 100) 2 Table 2 Yarn twist 3 Table 3 Construction and properties of finished fabric 4 Table 4 Permeability requirements 4BS 5F 118:20
7、02 ii BSI 22 May 2002 Foreword This British Standard, prepared 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 4F 118:1990, which is withdraw
8、n. This revision updates the standard, introduces intermingled 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
9、an aerospace series standard is indicated by a prefix number. 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 Britis
10、h Standard does not of itself confer immunity from legal obligations. 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 5F 11
11、8:2002 BSI 22 May 2002 1 1 Scope This British Standard specifies the requirements for a range of nylon fabrics, of nominal mass per unit area of 50 g/m 2 , for aerospace purposes, primarily for parachute canopies. NOTE The information to be supplied by the purchaser in the contract or order should b
12、e as listed in Annex A. 2 Normative references The following referenced 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
13、 F 100, Procedure for inspection and testing of textiles for aerospace 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, Te
14、xtiles Determination of twist in yarns Direct counting method. BS 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
15、ageing breaking strength lost after a specified heat treatment NOTE 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
16、 specified in Clause 4 to Clause 11 of this standard, the requirements 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, exce
17、pt 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 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
18、the number of tests required to produce a package mean shall be five.BS 5F 118:2002 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-
19、resistant polymer. 5.2 Properties 5.2.1 The yarn prior to twisting shall have the following properties: a) a nominal linear density of 50 dtex 1)and contain 15 filaments; b) a mean breaking force per package of not less than 260 cN, and a mean elongation at break per package not exceeding 30 %. 5.2.
20、2 The yarn prior to twisting shall not lose more than 20 % of 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. Section of BS F 100 Section title Requirements and tests in BS F 100 1 Gener
21、al All requirements 2 Quality requirements 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
22、 in wide fabrics 3 Physical tests Test for 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 C
23、hemical tests Test for water extractable matter 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 6 kg/m.BS 5F 118:2002 BSI 22 May 2002 3 Table 2 Yarn twist 6 Manufacture 6.1 The weave shall be plain. 6.2 In f
24、abric 1302 a single black thread, the same count as the warp ends, shall be included in the fabric not less than 50 mm in from each finished edge, to distinguish this fabric from fabrics 556 and 854. 6.3 When fabric woven as 1302 is used to produce fabric 1307, the black identifying thread shall als
25、o be present in fabric 1307. 7 Finish 7.1 General 7.1.1 Except for fabric 1307, the fabric shall not be pressed or calendered, and shall be supplied scoured and either: a) undyed; or b) dyed (see 7.2). 7.1.2 Fabric 1307 shall be supplied scoured, calendered on both sides, and either: a) undyed; or b
26、) 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 An appropriate British Standard would be BS 381C:1996. NOTE The requirement for dyed or undyed fabric should be specified by the
27、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 a similar appearance on both faces. Fabric designation Y
28、arn twist turns/m Warp Weft 556 160 15 Intermingled 295 30 Intermingled 854 160 15 295 30 295 30 160 15 295 30 295 30 1302 160 15 Intermingled 295 30 Intermingled 1307 160 15 Intermingled 295 30 IntermingledBS 5F 118:2002 4 BSI 22 May 2002 8 Construction and properties of finished fabric 8.1 When te
29、sted in accordance with 4.1, the fabric in the finished state shall comply with the requirements of Table 3. 8.2 The minimum usable width of the finished fabric shall be 920 mm unless otherwise stated by the purchaser in the contract or order (see Annex A). NOTE The fabric may be woven in multiple w
30、idths 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 with 4.1, each piece of finished fabric shall have a mean permeability as shown in Table 4. NOTE
31、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 as low as possible. Table 4 Permeability requirements 10 Water extractable matter When tested in
32、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 date of this British Standard, i.e. BS 5F 118:2002 2) , together with the relevant designation g
33、iven in Table 3 and, if required dyed, the colour. NOTE This identification may be codified, e.g. fabric 854 required dyed olive drab may be identified as BS 5F 118:2002/854/BS 381C:1996 No. 298. Designation Minimum number of threads per centimetre a Maximum mass per unit area Minimum average breaki
34、ng strength Minimum breaking extension Minimum tearing strength b g/m 2 N/50 mm % N Warp Weft Warp Weft Warp Weft Warp Weft 556 39.5 39.5 50 510 510 22 22 30 25 854 39.5 38.0 50 475 475 22 22 30 30 1302 41.5 41.5 52 510 510 22 22 32 27 1307 39.5 39.5 52 510 510 22 22 30 25 a Calculated from the numb
35、er of threads in a measured length of not less than 2 mm. b Warp tear means tearing across warp threads. Weft tear means tearing across weft threads. Fabric Mean permeability a 556 3 800 800 854 7 000 800 1302 2 150 460 1307 760 460 a Mean permeability readings refer to l/(m 2 s), i.e. volume of air
36、 in litres passing through 1m 2of fabric in 1 s at 2.5 kN/m 2 (25.4 cm water gauge). 2)Marking BS 5F 118:2002 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard.
37、 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 of conformity.BS 5F 118:2002 BSI 22 May 2002 5 Annex A (informative) Information to be supplied by the purchaser The following inf
38、ormation should be stated by the purchaser in the contract or order: a) the number of this British Standard, i.e. BS 5F 118; b) the fabric designation from Table 3; c) whether the fabric is required dyed or undyed (see Clause 7); d) the minimum usable width required (see Clause 8). Annex B (normativ
39、e) Heat ageing test B.1 Principle Specimens of yarn are heated 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 bre
40、aking strength as determined from unheated comparison specimens. 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
41、 150 C to 250 C, with control of the selected temperature to 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 great
42、er than 2 C). B.2.3 Suitable timer. B.2.4 Wrap wheel, of 1 m 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
43、 carry out all tests in the standard atmosphere for testing, as 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 t
44、ogether to form a skein, release the retractable arm of the wrap 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 atmosp
45、here 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.BS 5F 118:2002 6 BSI 22 May 2002 B.5.3 When the oven is at the required t
46、emperature, open the oven door, immediately insert the rod or hook frame and close the door. B.5.4 Start the timer. B.5.5 After (60 1) min, put on heat-resistant gloves, open the oven door and remove the rod or frame. B.5.6 Hang the skeins to condition in the standard atmosphere for testing defined
47、in B.3. Condition for a minimum of 2 h. B.5.7 Using one of the following sets of conditions, determine the breaking strength of the unheated and the heated specimens: a) gauge length of (250 1) mm, a cross-head speed of 100 mm/min; b) gauge length of (500 1) mm, a cross-head speed of 200 mm/min. B.5
48、.8 Record the breaking strength in newtons to the nearest 0.1 N. B.6 Calculation and expression of results B.6.1 Calculate the mean breaking strength for the unheated control sample and for the heated sample in newtons. B.6.2 Calculate the percentage strength loss as follows: S L= where B.7 Report B
49、.7.1 Report the percentage strength loss of the material tested to the nearest 0.1 %. B.7.2 Report the test conditions used (see B.5.7). S L is the percentage strength loss; S u is the mean breaking strength of unheated sample; S h is the mean breaking strength of heated sample. S u S h S u - 100 BS 5F 118:2002 BSI 22 May 2002 7 Bibliography Standards publication BS 381C:1996, Specification for colours for identification, coding and special purposes.
