1、BRITISH STANDARD AEROSPACE SERIES BS PL 8:2005 Fibrous polyamide material for use as an explosion suppressant and as a baffle material in aircraft fuel tanks Specification ICS 49.025.40; 83.120 BS PL 8:2005 This British Standard was published under the authority of the Standards Policy and Strategy
2、Committee on 10 June 2005 BSI 10 June 2005 The following BSI references relate to the work on this standard: Committee reference ACE/65 Draft for comment 04/30115934 DC ISBN 0 580 45903 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Techn
3、ical Committee ACE/65, Inspection and testing requirements for non-metallic materials, upon which the following bodies were represented: British Hydromechanics Research Group British Plastics Federation Society of British Aerospace Companies Ltd. Co-opted members The following bodies were also repre
4、sented in the drafting of this standard, through panel ACE/65/-/64, Structural reinforced plastic: Defence Science and Technology Laboratory Co-opted members Amendments issued since publication Amd. No. Date Text affectedBS PL 8:2005 BSI 10 June 2005 i Contents Page Committees responsible Inside fro
5、nt cover Foreword ii 1S c o p e 1 2 Normative references 1 3 Terms and definitions 1 4 Material 1 5 Properties 1 6 Quality of material 2 7 Marking, labelling and packaging 3 Table 1 Properties of the material 2 Table 2 Sheet density 2 Table 3 Physical and mechanical properties 2 Table 4 Fuel retenti
6、on 2BS PL 8:2005 ii BSI 10 June 2005 Foreword This British Standard has been prepared under the direction of ACE/64/-65. With BS PL 9, this document supersedes DTD 5627, April 1982, which was declared obsolescent by the Ministry of Defence from 1st April 1999. Test methods associated with this speci
7、fication are published separately as BS PL 9. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health
8、 and safety at any stage. 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 page
9、s This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS PL 8:2005 BSI 10 June 2005 1 1 Scope This British Standard specifies requirements for polya
10、mide fibrous material intended for suppression of explosions in aircraft fuel tanks. The material may be supplied as flat sheets or preformed shapes. NOTE The material is intended for use in integral, rigid or flexible aircraft fuel tanks containing such fuels as Avtur, Avcat and Avtag at temperatur
11、es up to 110 C with intermittent peaks up to 130 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced document (includi
12、ng any amendments) applies. BS PL 9, Fibrous polyamide material for use as an explosion suppressant and as a baffle material in aircraft fuel tanks Test methods. 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply. 3.1 melding process in which
13、 bonds are formed between fibres in contact with each other by raising their temperature to a point where the polymer forming the surface layer softens sufficiently for bonding to occur. 4 Material The sheet material or preformed shapes shall be manufactured to issue-controlled documents, which shal
14、l form part of the contract between purchaser and manufacturer. Changes to the manufacturing process shall not be made without due consideration being given that the modified material meets all the requirements of the standard. 5 Properties 5.1 General The sheet material shall consist of fibrous pol
15、yamide material bonded together by a melding process without the use of adhesive. The fibre incorporated in the sheet material shall be white in colour, and the sheet material shall have a minimum polyimide content of 99 %. The material shall lie substantially flat on both of the main surfaces. The
16、material shall not chemically interact with nor cause physical damage to rigid or flexible fuel tanks and sealants used in these tanks. The standard size of sheet shall be 480 480 120 mm with the main fibre orientation being in the 480 mm direction and density gradient in the 120 mm direction, or as
17、 otherwise agreed between the purchaser and manufacturer. Material supplied in sheet form shall be free from surface imperfections or any other defect that would impair satisfactory performance. Surface imperfections can be supplied in material that is preformed prior to installation provided such i
18、mperfections are identified by their nature and level of incidence for the purchaser to accept.BS PL 8:2005 2 BSI 10 June 2005 5.2 Properties of the material The material shall meet the requirements of Table 1 when tested in accordance with BS PL 9. Extract test samples from sheet submitted for test
19、 in accordance with Figure A1 of BS PL 9. Table 1 Properties of the material 6 Quality of material Each sheet of material manufactured when tested in accordance with BS PL 9 shall meet the requirements of Table 2. Table 2 Sheet density A representative sheet of each manufactured batch of material wh
20、en tested in accordance with BS PL 9 shall meet the requirements of Table 3. Table 3 Physical and mechanical properties A representative sheet from every twentieth batch of material when tested in accordance with BS PL 9 shall meet the requirements of Table 4. Table 4 Fuel retention Property Require
21、ment a) Density, g/l 8.5 1 b) Density gradient (maximum) 1.25 c) Fibre diameter, 4m 41.5 3 d) Grab strength, N (minimum) 400 e) Initial 50 % compression force, N (minimum) 5 f) Loss of compression force after five cycles to 50 % compression, % (maximum) 4 g) Compression set, % (maximum) 2 h) Contami
22、nants (extractable), % (maximum) 0.2 j) Fuel retention, % (maximum) 4.5 k) Flammability Self-extinguishing Property Requirement Sheet density, g/l 8.5 2 Property Requirement a) Density, g/l 8.5 1 b) Density gradient, (maximum) 1.5 c) Grab strength, N (minimum) 300 d) Initial 50 % compression force,
23、N (minimum) 2.5 e) Loss of compression force after five cycles to 50 % compression, % (maximum) 5 f) Compression set, % (maximum) 3 g) Contaminants (extractable), % (maximum) 0.2 Property Requirement Fuel retention, % maximum 4.5BS PL 8:2005 BSI 10 June 2005 3 7 Marking, labelling and packaging 1) T
24、he labelling of the material shall consist of the following details in the following order: a) the number and date of this standard, i.e. BS PL 8:2005; b) the manufacturers name or trade mark, e.g. AB and Co.; c) the date of manufacture; d) the batch number. Each sheet of material shall be enclosed
25、in a heat sealed polyethylene film envelope and a label shall be securely attached to the film stating the requirements above and the sheet number. 1) Marking BS PL 8:2005 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufac
26、turer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity.BS PL 8:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Instituti
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