BS-4F-58-1990.pdf

BRITISH STANDARD AEROSPACE SERIES BS 4F 58:1990 Superseding BS 3F 58:1975 Specification for Cotton thread for aerospace purposes Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee (ACE/-), was published under the authority of the Board of BSI and comes into effect on 31 August 1990 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference ACE/22 Draft for comment 88/75255 DC ISBN 0 580 17910 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/22, upon which the following bodies were represented: British Association of Clothing Machinery Manufacturers British Narrow Fabrics Association Cordage Manufacturers Institute Lambeg Industrial Research Association Linen Sewing Thread Manufacturers Association Man-made Fibres Producers Committee Ministry of Defence Society of British Aerospace Companies Limited Society of Dyers and Colourists Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 © BSI 02-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2General requirements1 3Yarn1 4Construction and properties1 5Finish1 6Type test1 7Identification1 Table 1 General requirements1 Table 2 Construction and properties of finished thread2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 ii © BSI 02-2000 Foreword This British Standard prepared under the direction of the Aerospace Standards Policy Committee is one of a series for materials of a quality suitable for aerospace purposes. It is a revision of BS 3F 58 which is withdrawn. It differs from the previous edition primarily in that only one thread is now specified. The quality assurance authority referred to in this standard is as stated in the contract or order, or the accredited representative of the authority stated, as instructed by the prime contractors. 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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 © BSI 02-20001 1 Scope This British Standard specifies the requirements for a cotton thread, for use primarily as safety ties and break threads, for aerospace purposes. NOTE 1The titles of publications referred to in this standard are listed on the inside back cover. NOTE 2The latest revision of an Aerospace standard is indicated by the prefix number. 2 General requirements 2.1 In addition to the requirements specified in clauses 3 to 7 of this standard the requirements of the latest edition of BS F 100 indicated in Table 1 shall apply. 2.2 Thread manufactured in accordance with this standard shall comply with the following. a) Freedom from defects. i) The thread shall have uniformity of thickness, construction, and component ply tension so that there are no visually irregular twist defects. ii) The thread shall contain no thread knots. NOTEUp to two laid-on ends per package are permitted. b) Length per unit mass. The length per unit mass of thread shall be determined in accordance with BS 2010, method A. 3 Yarn The thread shall be manufactured from combed cotton yarn. 4 Construction and properties 4.1 The construction and properties of the finished thread shall comply with the requirements of Table 2. 4.2 The direction of final twist shall be Z. 5 Finish 5.1 Condition of material The thread shall be supplied scoured, dyed to BS 381C shade 539 and rot-proofed with pentachlorophenyl laurate (PCPL) in accordance with BS 2087-1, normal process. NOTEIt is very important that the scouring process is thorough in order to remove surface acting agents, and processing acids. 5.2 Finish 5.2.1 The thread shall have a soft finish. 5.2.2 Finishes which promote microbiological growth (e.g. starch or modified starch) shall not be applied. NOTEA lubricating finish may be applied to the thread to facilitate its performance. 6 Type test 6.1 General 6.1.1 The type test specified in 6.2 shall be carried out to the satisfaction of the quality assurance authority. 6.1.2 After initial satisfaction of the type test, no changes in respect of either the materials or processing conditions used shall be made without the type test being repeated to the satisfaction of the quality assurance authority. 6.1.3 The manufacturers records of type tests shall be made available to the quality assurance authority on request. 6.2 Loop breaking strength The thread shall have a minimum average loop breaking strength of 20 N when tested in accordance with BS 1932-2. 7 Identification The thread shall be identified for ordering purposes by the number of this British Standard, i.e. BS 4F 58. Table 1 General requirements (given in BS F 100) SectionTitleRequirements and tests 1GeneralAll requirements. 2aQuality requirementsRequirements for dyed textiles except those relating to fabric intended for coating. Requirements for freedom from corrosive impurities (see section 4). 3Physical testsTests for breaking strength and extension under load. 4Chemical testsIf required by Section 2, test for freedom from corrosive impurities. a It is not intended that section 2 tests should be performed on each thread batch. The frequency of these tests should be agreed between the quality assurance authority and the thread manufacturer. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 2 © BSI 02-2000 Table 2 Construction and properties of finished thread Designation Structure Nominal tex/turns per metrea (tpm) Minimum length per unit mass Minimum average breaking strength Maximum strength 60/2/310 tex × 2S 1 350-1 650 × 3Z 530-650 m/kg 14 500b N 13.3 N 20 a The twist shall be determined in accordance with BS 2085. b The added mass due to the dye and finish should not exceed a total of 10 % of the original mass. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 © BSI 02-2000 Publications referred to BS F 100, Procedure for inspection and testing of textiles for aerospace purposes. BS 381C, Specification for colours for identification, coding and special purposes. BS 1932, Methods of testing the strength of yarns and threads from packages. BS 1932-2, Determination of knot strength and loop strength. BS 2010, Method for determination of the linear density of yarns from packages. BS 2085, Method of test for determination of twist in yarns, direct counting method. BS 2087, Preservative treatments for textiles. BS 2087-1, Specification for treatments. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 58:1990 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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