1、BRITISH STANDARD AEROSPACE SERIES BS 5F 54:2002 (Superseding BS 4F 54:1985) Heavy duty linen (flax) sewing thread for aerospace purposes ICS 49.025.60 BS 5F 54:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published
2、under the authority of the Sector Policy and Strategy Committee on 17 October 2002 BSI 17 October 2002 First published BS F 54:1930 Second edition BS 2F 54:1960 Third edition BS 3F 54:1975 Fourth edition BS 4F 54:1985 Fifth edition BS 5F 54:2002 The following BSI references relate to the work on thi
3、s standard: Draft for comment 00/707767 DC Committee reference ACE/22 ISBN 0 580 37035 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/22, Cords, ropes and threads for aerospace purposes, upon which the following bo
4、dies were represented: Linen Sewing Threads Manufacturers Association Ministry of Defence UK Defence Standardization Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBS 5F 54:2002 BSI 17 October 2002 i Contents Page Committees responsible Inside f
5、ront cover Foreword ii 1S c o p e 1 2 Normative references 1 3G e n e r a l 1 4Y a r n 1 5 Finish 2 6 Construction and properties 2 7 Identification 2 Bibliography 3 Table 1 General requirements (given in BS F 100) 1 Table 2 Construction and properties 2BS 5F 54:2002 ii BSI 17 October 2002 Foreword
6、This British Standard, prepared under the direction of Technical Committee ACE/22, is one of a series for textiles of a quality suitable for aerospace purposes. It supersedes BS 4F 54:1985 which is withdrawn. NOTE The previous edition, BS 4F 54:1985, differed from the earlier edition in that it requ
7、ired all thread be supplied rotproofed. This new edition incorporates all earlier amendments, updates references and improves nomenclature in line with other standards in the same series. This publication does not purport to include all the necessary provisions of a contract. Users are responsible f
8、or its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. WARNING NOTES This standard calls for the use of substances and/or test procedures that may be injurious to health if adequate precautions are not taken. It refers only to techni
9、cal suitability and in no way absolves either the supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. This standard specifies pentachlorophenyl laurate (PCPL) as the only approved rotproofing treatment for aerospace textiles. Alternative
10、treatments are under development, and this standard will be updated to delete PCPL as soon as an approved alternative treatment for aerospace textiles is available. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. The BSI c
11、opyright notice displayed in this document indicates when the document was last issued.BS 5F 54:2002 BSI 17 October 2002 1 1 Scope This British Standard specifies requirements for heavy duty linen (flax) sewing thread for aerospace purposes. NOTE The latest revision of an Aerospace Series standard i
12、s indicated by a prefix number. 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) app
13、lies. BS 2087-1, Preservative treatments for textiles Specification for treatments. BS F 100, Procedure for inspection and testing of textiles for aerospace purposes. BS EN ISO 2060:1995, Textiles Yarn from packages Determination of linear density (mass per unit length) by the skein method. BS EN IS
14、O 2061, Textiles Determination of twist in yarns Direct counting method. 3 General 3.1 General In addition to the requirements specified in Clause 4, Clause 5, Clause 6 and Clause 7 of this standard the requirements and tests given in the latest edition of BS F 100 as specified in Table 1, shall app
15、ly. Table 1 General requirements (given in BS F 100) 3.2 Freedom from faults The thread shall have uniformity of thickness, construction, and component ply tension so that there are no visually irregular twist faults. The thread shall contain no thread knots. 3.3 Length per unit mass The length per
16、unit mass of thread shall be determined in accordance with BS EN ISO 2060:1995, Option 1. 4 Yarn 4.1 The thread shall be manufactured from flax fibre (Linum usitatissimum). 4.2 The mass of the yarn shall be reduced by not less than 10 % by boiling. NOTE The degree of boiling of the yarn should be de
17、termined from the manufacturers records, where available. Otherwise, the residual alkali solubility of the thread should be determined and should not exceed 10 %. Section of BS F 100 Section title Requirements and tests 1 General All requirements 2 a Quality requirements Requirements for dyed textil
18、es except those related to fabric intended for coating. Requirements for freedom from corrosive impurities (see BS F 100, Section 4). 3 Physical tests Tests for breaking strength and extension under force 4C h e m i c a l tests Test for residual alkali solubility. If required by BS F 100, Section 2:
19、 test for conductivity of aqueous extract; test for pH value of aqueous extract; test for water soluble chloride; test for water soluble sulfate. a It is not intended that BS F 100, Section 2 tests should be performed on each thread batch. The frequency of these tests should be agreed between the Qu
20、ality Assurance Authority and the thread manufacturer, see BS F 100.BS 5F 54:2002 2 BSI 17 October 2002 5 Finish 5.1 Condition of material The thread shall be supplied in one of the following conditions: a) undyed and rotproofed; b) undyed, rotproofed and wax finished; c) dyed and rotproofed; d) dye
21、d, rotproofed and wax finished. 5.2 Dyeing Where dyeing is required, the colour shall be specified either by reference to a British Standard, e.g. BS 381C, or by pattern. 5.3 Rotproofing The thread shall be treated with pentachlorophenyl laurate (PCPL) from aqueous emulsion, normal process, in accor
22、dance with BS 2087-1, normal process. 5.4 Wax finishing Where wax finishing is required, beeswax substitute microcrystalline hydrocarbon wax shall be used and the added mass due to the wax shall be (20 5) %. Prior to waxing, the thread shall have been rotproofed in accordance with 5.3. 5.5 Surface f
23、inish Thread supplied in accordance with item 5.1a) or 5.1c) shall have a soft, smooth finish, but substances that may promote microbiological growth (e.g. starch or modified starch) shall not be applied. 6 Construction and properties 6.1 Where undyed thread is supplied, the thread shall conform to
24、the requirements given in Table 2. 6.2 Where dyed thread is supplied, the thread shall conform to the requirements of Table 2 except that the minimum breaking strengths shall be reduced by 10 %. NOTE Unless otherwise specified, the direction of final twist should be Z. Table 2 Construction and prope
25、rties 7 Identification The thread shall be identified by the number of this British Standard, i.e. BS 5F 54, together with the finish and, if required dyed, the colour. NOTE This identification may be codified. For example, thread required dyed black and unwaxed may be identified as “BS 5F 54/black/
26、unwaxed”. Nominal resultant linear density Number of plies Final twist a Length per unit mass b Minimum breaking strength unwaxed waxed tex Turns/m m/kg N N 690 8 118 6 1 450 160 220 180 a The final twist shall be determined in accordance with BS EN ISO 2061. b The length per unit mass shall be dete
27、rmined by weighing a skein conditioned and reeled in accordance with BS EN ISO 2060:1995, Option 1. The values stated for length per unit mass exclude the mass of added dye and/or finishes.BS 5F 54:2002 BSI 17 October 2002 3 Bibliography Standards publications BS 381C:1996, Specification for colours
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