EN 2781-1998 en Aerospace Series - Non-Metallic Materials - Structural Adhesives - Test Methods - Determination of the Primer Thickness《非金属材料 结构胶粘剂的试验方法 初始厚度的测定》.pdf

1、BRITISH STANDARD AEROSPACE SERIES Non-metallic materials - Structural adhesives - Test methods - Determination of the primer thickness The European Standard EN 2781:1998 has the status of a British standard ICs 49.025.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 27

2、81:1998 - STD-BSI BS EN 2783-ENGL 3998 W 3b2ilbb9 0723255 T37 BS EN 2781:1998 National foreword This British Standard is the English language version of EN 2781: 1998. The UK participation in its preparation was entrusted to Technical Committee ACW63, Aerospace sb-uctural adhesives, which has the re

3、sponsibility to: - aid enquirers to understand the text; - present to the responsible inte - embedded in a synthetic resin compound according to a procedure adapted to the material avoiding any reaction with the primer and ensuring a sufficient contrast to it; - ground and polished until any distort

4、ion or damage to the primer due to sampling has been eliminated. The direction of grinding shall be from the primer to the base material. 5.4 Measurement The thickness shall be measured with a magnification of at least 500 times by means of an optical microscope using incident light, the cross secti

5、on surface being perpendicular to the optical axis. The ocular micrometer shall be calibrated before measurement. The calibration factor shall be recorded. Five measurements shall be made at various points of the cross section. 5.5 Assessment The primer thickness corresponds to the arithmetical mean

6、 of the five measurements. 5.6 Test report It shall include the following: - designation of the method: EN 2781A, - designation of the primer; - identification of the test pieces, .e. number and position on the component; - position of the five measurement points; - calibration factor of the ocular

7、micrometer; - thickness in micrometers (individual values and the mean value); - deviations from this standard. Page 5 EN 2781 :1998 6 Method B 6.1 Principle Determination of the average thickness based on the ratio: mass per unit area/density of the primer. 6.2 Apparatus Balance with a sufficient a

8、ccuracy to meet the requirements of 6.3. 6.3 Measurements The coating surface of the test panel shall be measured to 1 mmz. The mass of the test panel shall be determined to 0,001 g before applying the primer and immediately after curing. 6.4 Calculation of thickness The average thickness is calcula

9、ted as follows: where: S G Go F Y is the average primer thickness, in micrometres; is the mass of test panel with cured primer, in grams; is the mass of test panel before application of primer, in grams; is the coating surface, in square millimetres; is the density of cured primer, in grams per cubi

10、c centimetre. 6.5 Test report It shall include the following: - designation of the method: EN 27818; - designation of primer; - density of cured primer; - identification of the test panel; - calculated average primer thickness; - deviations from this standard. STD-ES1 ES EN 2781-ENGL 1998 162Ybb9 07

11、212bL 230 Page 6 EN 2781:1998 7 Method C 7.1 Principle See IS0 2360. 7.2 Definitions See IS0 2360 and IS0 2064. 7.3 Apparatus See IS0 2360. 7.4 Factors affecting the measurement See IS0 2360. 7.5 Adjustment See IS0 2360. 7.6 Determining the primer thickness See IS0 2360. 7.7 Assessment For every ref

12、erence area, the local primer thickness is the arithmetical mean of three individual measurements. The thickness on the significant surface of the measured object is the arithmetical mean of local thicknesses. 7.8 Test report It shall include the following: - designation of the method: EN 2781C; - d

13、esignation of primer; - type and designation of the measured object; - measurement equipment or installations; - test conditions; - type of adjustment, and type of reference test piece; - position of the significant surfaces; - position and number of the selected reference areas; - individual values

14、 of the thickness measured on the reference areas, local thicknesses; - calculated mean value for the significant surface; - deviations from this standard. BS EN 2781:1998 BSI 389 Chiswick High Road London w4 4AL - STD-BSI BS EN 2783-ENGL 1998 D 1624bb9 0723262 377 D BSI - British Standards Institut

15、ion 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 shoul

16、d 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 senrices. We would be grateful if anyone finding an inaccuracy or ambiguiSr while using this British Standard would inform the Secretary of the technical committe

17、e responsible, the identity of which can be found on the inside front cover. Tel O181 996 9OOO. Fax: 0181 996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI

18、, international and foreign standards publications should be addressed to Customer SeMces. Tel O181 996 7000. Fax O181 996 7001. in response to orders for intemationai standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwis

19、e requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are rus0 available which give details on all its products and

20、services. Contact the Information Centre. Tel: O181 996 7111. Fax: O181 996 7W. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Adminkhh on. Tel

21、 O181 996 7002. Fax: 0181 996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the intemational standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, store

22、d in a retrieval system or tmnmitk d in any form or by any means - electronic, photocopying, recording or otherwise - without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary detaiis such as symbols, and size, type or gr

23、ae designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is gmnted, the tem may include royalty payments or a licensing agreement De& and avice can be obtained from the Copynght Manager. Tel O181 996 7070.