1、BRITISH STANDARD AEROSPACE SERIES BS EN 2781:1998 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 49.025.50BSEN2781:1998 This British Standard, having been prepared under the di
2、rectionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes into effect on 15 October 1998 BSI 05-1999 ISBN 0 580 30549 X National foreword This British Standard is the English language version of EN2781:1998. The UK participation in its preparation was e
3、ntrusted to Technical CommitteeACE/63, Aerospace structural adhesives, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UKinterests informed; m
4、onitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this d
5、ocument may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users o
6、f 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, theEN title page, pages 2 to 4 and a back co
7、ver. 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. Amendments issued since publication Amd. No. Date CommentsBSEN2781:1998 BSI 05-1999 i Contents Page National foreword Inside fro
8、nt cover Foreword 2 Text of EN 2781 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2781 July 1998 ICS 49.025.50 Descriptors: Aircraft industry, adhesives, tests, determination, thickness, microscopic analysis, gravimetric methods, eddy current tests English version Aerospace series No
9、n-metallic materials Structural adhesives Test methods Determination of the primer thickness Srie arospatiale Matriaux non-mtalliques Adhsifs structuraux Mthodes dessai Dtermination de lpaisseur de primaire Luft- und Raumfahrt Nichtmetallische Werkstoffe Strukturelle Klebstoffe Prfverfahren Bestimmu
10、ng der Haftgrundmittel-Schichtdicke This European Standard was approved by CEN on 15 May 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-da
11、te lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the
12、 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg
13、, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any
14、 means reserved worldwide for CEN national Members. Ref. No. EN 2781:1998 EEN2781:1998 BSI 05-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Associatio
15、n, 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 given the status of a national standard, either by publication of an identical text or by endorsement,
16、 at the latest by January1999, and conflicting national standards shall be withdrawn at the latest by January1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech
17、Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Application of methods 3 4 Values for measurement uncertainty 3 5 M
18、ethod A 3 6 Method B 3 7 Method C 4EN2781:1998 BSI 05-1999 3 1 Scope This standard defines the test methods for the determination of the primer thickness for structural adhesives. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publicati
19、ons. These normative references 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. F
20、or undated references the latest edition of the publication referred to applies. ISO 2064, Metallic and other non-organic coatings Definitions and conventions concerning the measurement of the thickness. ISO 2360, Non-conductive coatings on non-magnetic basis metals Measurement of coating thickness
21、Eddy current method. ISO 3543, Metallic and non-metallic coatings Measurement of thickness Beta back-scatter method. 3 Application of methods Method A: Microscopic measurement: This destructive method is of general use. It is alsousedto determine reference values for the non-destructive methods. Met
22、hod B: Gravimetric determination: This non-destructive method is particularly suitable for determination of the primer thickness on test panels. Method C: Eddy current method: This non-destructive method is used for the measurement ofthe thickness of non-conductive primers on non-ferromagnetic metal
23、lic components. For special applications (e.g.automated production), other methods may be suitable (e.g.thebeta backscatter method to ISO 3543). 4 Values for measurement uncertainty Method A: 0,84m Method B: 1 4m Method C: 1,54m 5 Method A 5.1 Principle The primer thickness is measured on a cross se
24、ction by means of an optical microscope. 5.2 Apparatus Basic metallographic equipment for the preparation of microscopic sections. Optical microscope capable of a magnification of at least 500 times, fitted with an ocular micrometer. 5.3 Test pieces They shall be: cut in the direction from the prime
25、r to the base material and perpendicularly to the coating surface; 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 distortion or damage to the primer
26、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 least500times by means of an optical microscope using incident light, the cross section surface being perpendicular
27、 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 of the five measurements. 5.6
28、 Test report It shall include the following: designation of the method: EN 2781A; designation of the primer; identification of the test pieces, i.e.number and position on the component; position of the five measurement points; calibration factor of the ocular micrometer; thickness in micrometers (in
29、dividual values and the mean value); deviations from this standard. 6 Method B 6.1 Principle Determination of the average thickness based on the ratio: mass per unit area/density of the primer.EN2781:1998 4 BSI 05-1999 6.2 Apparatus Balance with a sufficient accuracy to meet the requirements of6.3.
30、6.3 Measurements The coating surface of the test panel shall be measured to1mm 2 . The mass of the test panel shall be determined to0,001g before applying the primer and immediately after curing. 6.4 Calculation of thickness The average thickness is calculated as follows: where: 6.5 Test report It s
31、hall include the following: designation of the method: EN 2781B; designation of primer; density of cured primer; identification of the test panel; calculated average primer thickness; deviations from this standard. 7 Method C 7.1 Principle See ISO 2360. 7.2 Definitions See ISO 2360 and ISO 2064. 7.3
32、 Apparatus See ISO 2360. 7.4 Factors affecting the measurement See ISO 2360. 7.5 Adjustment See ISO 2360. 7.6 Determining the primer thickness See ISO 2360. 7.7 Assessment For every reference area, the local primer thickness is the arithmetical mean of three individual measurements. The thickness on
33、 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; designation of primer; type and designation of the measured object; measurement equipment or installations; test conditi
34、ons; type of adjustment, and type of reference test piece; position of the significant surfaces; position and number of the selected reference areas; individual values of the thickness measured on the reference areas, local thicknesses; calculated mean value for the significant surface; deviations f
35、rom this standard. S is the average primer thickness, in micrometres; G is the mass of test panel with cured primer, in grams; G 0 is the mass of test panel before application of primer, in grams; F is the coating surface, in square millimetres; is the density of cured primer, in grams per cubic cen
36、timetre. S GG 0 F . * -10 6 =blankBS EN 2781:1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated
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