1、BRITISH STANDARD AEROSPACE SERIES Carbon fibre preimpregnates - Determination of the volatile content STD-BSI BS EN 2558-ENGL L997 Lb24bbS Ob2015b L4b BS EN 2558 : 1997 The European standard EN 2558 : 1997 has the status of a British Standard ICs 49.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS
2、 PERMITTED BY COPYRIGHT LAW 81 STD-BSI BS EN 2558-ENGL 1977 R 1b24bb7 Ob20157 O82 Ama No. BS EN 2668 : 1997 Date Text affected This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effe
3、ct on 15 June 1997 O BSI 1997 The following BSI references relate to the work on this Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/, Aerospace structurai reinforced plastics, upon which the following bodies were re
4、presented British Plastics Federaion Ministry of Defence Society of British Aerospace Companies Committee reference ACWM Draft for comment 8W342 DC ISBN O 580 26684 2 1 STD-BSI BS EN 2558-ENGL 1997 Lb24bb7 Ob20158 T19 = BS EN 2558 : 1997 Contents Committees responsible Nationai foreword page inside
5、front cover ii Foreword Specification 1 Scope 2 Normative references 3 Principle 4 4P- 5 Specimens 6 Procedure 7 Expressionofresults 8 Heaith and safety requirements 9 Testreport 2 3 3 3 3 3 6 7 7 7 Figures 1 2 Example of positioning of specimens on woven carbon fibre fabrics sample across the width
6、 4 Example of positioning of specimens on woven carbon fibre fabric sample along an axis inclined at an angle as close as possible to the weft direction 5 Example of positioning of specimens on carbon fibre unidirectional sheet or tape sample 5 3 O BSI 1997 1 STD-BSI BS EN 2558-ENGL 1997 lb24bb9 Ob2
7、0157 755 M BS EN 2668 : 1997 I National foreword This British Standard has been prepared by Technid Committee ACW64 and is the English ianguage version of EN 2558 : 1997 Amspace series - Carbon fibre prernpreputes - DetemLinutm of the uolate content, published by the European Committee for Standardi
8、zation (CEN). EN 2558 : 1997 was produced as a result of intedonal discussions in which the United Kingdom took an active part. Cross-references The British Standards corresponding to the European Standards referred to in the text are identical in number and title with those given in clause 2. Compl
9、iance 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, the EN titie page, pages 2 to 8, an inside back cover and a back cover. ii O BSI 1997 STD.BSI BS EN 2550-ENGL 1777 W
10、 lb2Ybb7 Db201b0 b77 D EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2558 January 1997 ICs 49.040.10 Descriptors: aircraft industry, preimpregnated product, carbon fibre, chemical analysis, determination of content, volatile matter English version Aerospace series - Carbon fibre preimpregnate
11、s - Determination of the volatile content SCrie arospatiale - Primprgds de fibres de carbone - DCtermination de la teneur en mstikes volatiles Luft- vd Raunfahrt - Kohlenstoffaser-Prepregs - Bestinnrng des Anteils an flkhtigcn Eestandtei Len This European Standard was approved by CEN on 1996-08-04.
12、CEN Wrs are bound to conply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on appli
13、cation to the Central Secretariat or to any CEN nrniber. The European Standards exist in three official versions (English, French, German). A version in any other lawge made by translation mder the responsibility of a CEN member into its om language and notified to the Central Secretariat has the en
14、e status as the official versions. CEN nieiakrs are the national standards bodies of Austria, Belgiun, Drnerk, Finland, France, Germmy, Greece, Iceld, Ireland, Italy, Luxanbourg, Netherlands, Norway, Portugal, Spain, Sueden, Switzerland and United Kingdoai. CEN European Ccnnnittee for Standardizatio
15、n Comite Europen de Normalisation Europisches Komitee fr Normng Central Secretariat: rue de Stasaart,3 8-1050 Bruln 0 1997 Copyright reserved to CEN inembers Ref. No. EN 2558:1W7 E Page 2 EN 2558: 1997 Foreword This European Standard has been prepared by the European Association of Aerospace Manufac
16、turers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be g
17、iven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 1997, and conflicting national standards shall be withdrawn at the latest by July 1997. According to the CENKENELEC Internal Regulations, the national standards organizations o
18、f the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. STD*BSI BS EN 2558-ENGL 1997 9 Lb24bb7 Ob201b2
19、q4T 9 Page 3 EN 2558:1997 1 Scope This standard specifies a method for determining the volatile content in carbon fibre preimpregnates for aerospace use. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative refer
20、ences are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the
21、latest edition of the publication referred to applies. EN 2743 Aerospace series - Reinforced plastics - Standard procedures for conditioning prior to testing 1) 3 Principle Measurement of the loss in mass due to exposure of a specimen to an elevated temperature for a specified time. This loss is exp
22、ressed as a percentage of the initial mass. 4.1 Balance with an accuracy of 0,l mg * G-J * 4.2 Template of standard specimen 4.3 Ancillary items such as a sharp knife and tweezers 4.4 may drip during the test. Specimen support (tray) of suitable material, e.g. metal or ceramic, to retain any resin t
23、hat 4.5 Air circulating oven capable of maintaining a temperature to an accuracy of k 5 OC. 4.6 phosphorus pentoxide). Dessiccator containing a suitable drying agent (for example, silica gel, calcium chloride, 5 Specimens 5.1 Shape and dimensions The specimen shall be square and have sides of (100 f
24、 1) mm. Other specimens may be used, subject to agreement between the user and manufacturer on condition that they have an area of 100 cm2 with a tolerance of f 2 %. 1) Published as AECMA Prestandard at the date of publication this standard STD-BSI BS EN 2558-ENGL 1997 Lb24bb9 Ob20Lb3 38b Page 4 EN
25、2558:1997 5.2 Number and distribution A minimum of three specimens shall be used. They shall : - be evenly distributed across the width of the sample ; - have their centres positioned along a straight line. See figure 1 for wide woven fabrics, figure 2 for narrow woven fabrics and figure 3 for unidi
26、rectional sheet or tape. Dimensions in millimetres I I Wett yarn I I direction - - I I I I I I I 1 I I I I Width of woven fabric Figure 1 Example of positioning of specimens on woven carbon fibre fabrics sample across the width * I m 2 50 - Page 5 EN 2558:1997 k 5c - Dimensions in millimetres I I We
27、ft varn I direciion I A- I 2 l Figure 2 Example of positioning of specimens on woven carbon fibre fabric sample along an axis inclined at an angle as close as possible to the weft direction Figure 3 Example of positioning of Specimens on carbon fibre unidirectional sheet or tape sample Page 6 EN 255
28、8:1997 6 Procedure 6.1 Conditioning 6.1.1 The amount of preimpregnate required for testing shall be sampled and then conditioned in the test atmosphere (see 6.2) for a minimum of 2 h, unless otherwise specified. Preimpregnates stored at ambient temperature 6.1.2 The preimpregnate, suitably packed in
29、 an airtight and solvent resistant bag to prevent moisture pick- up, shall be allowed to reach ambient temperature over a period of time depending on its mass. This time shall not be less than 8 h. Preimpregnates stored below ambient temperature When the material has reached ambient temperature, the
30、 amount required for testing shall be sampled and then conditioned in the test atmosphere (see 6.2) for a minimum of 2 h, unless otherwise specified. 6.2 Atmosphere for testing EN 2743, condition class B. 6.3 After conditioning, the sample shall be maintained in the test atmosphere. Unless otherwise
31、 specified, tests shall be carried out within 6 h. Time interval between conditioning and testing 6.4 Tests 6.4.1 Cut the specimens. 6.4.2 the nearest milligram. Weigh the tray (m3) after bringing it to constant mass by successive heating operations, to 6.4.3 Remove the protective films from the spe
32、cimen. 6.4.4 Weigh the specimen with its tray to the nearest milligram (m,). 6.4.5 material standard and ensure that the hot air circulates well around the specimen. Place the specimen with its tray in the oven maintained at the temperature specified in the 6.4.6 oven. After the time specified in th
33、e material standard remove the specimen and tray from the 6.4.7 Allow it to cooi-down to room temperature in the desiccator. 6.4.8 Weigh the specimen with its tray to the nearest milligram (+l. STD*BSI BS EN 2550-ENGL 1777 D LbZLibb7 Ob20Lbb 075 Page 7 EN 2558:1997 7 Expression of results where : V
34、ml m2 m3 is the volatile content expressed as a percentage of the initial mass ; is the initial mass of the specimen and its tray, in grams ; is the mass of the specimen and its tray, after heating, in grams ; is the mass of the tray, in grams. 8 Health and safety requirements It is the responsibili
35、ty of the user of this standard to adopt appropriate health and safety precautions. It shall include the following : - number of this standard ; - all data ensuring the traceability of the material (trade mark, identification marking, date of receipt etc.) ; - all information regarding the sampling
36、procedure ; - form and dimensions of specimens ; - period of conditioning ; - test atmosphere, for example temperature, relative humidity if these differ from 6.2 ; - time interval between conditioning and testing (see 6.3) ; - temperature and time of exposure in the oven if they differ from the mat
37、erial standard ; - individual values and arithmetic mean of the volatile content, - any incident which may have affected the results. STD-BSI BS EN 2558-ENGL 1797 = Lb24bb9 Ob20Lb7 T2L BS EN 2558 : 1997 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independe
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