1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 2757:2011Aerospace series Structuraladhesives system Testmethod Determinationof the drying and ignitionresidues of primersBS EN 2757:2011 BRITISH STANDARDNational forewordT
2、his British Standard is the UK implementation of EN 2757:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65, Non-metallic materials for aerospace purposes(excluding textiles).A list of organizations represented on this committee can beobtained on request to its s
3、ecretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73657 5ICS 49.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publish
4、ed under the authority of theStandards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate Text affectedBS EN 2757:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2757 May 2011 ICS 49.040 English Version Aerospace series - Structural adhesives system - Test
5、method -Determination of the drying and ignition residues of primers Srie arospatiale - Systme dadhsifs structuraux - Mthode dessai - Dtermination des rsidus de schage et de calcination des primaires Luft- und Raumfahrt - Strukturelle Klebstoffsysteme - Prfverfahren - Bestimmung des Trocknungs- und
6、Glhrckstandes von Haftgrundmitteln This European Standard was approved by CEN on 12 February 2011. 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-t
7、o-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by transla
8、tion under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,
9、 France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMIT
10、EE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2757:2011: EBS EN 2757:2011EN 2757:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Defini
11、tions and abbreviations 44 Health and safety .45 Principle/Technique .45.1 Method A .45.2 Method B .46 Resources .56.1 Apparatus/facilities/calibration 56.2 Materials/reagents .57 Test samples 58 Testing procedure58.1 Drying residue 58.2 Residue after ignition 59 Expression of results 610 Designatio
12、n 611 Test report 6BS EN 2757:2011EN 2757:2011 (E) 3 Foreword This document (EN 2757:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standa
13、rd has received the approval of the National Associations and the Official Services of the member countries of ASD, 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, at the latest b
14、y November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all suc
15、h patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
16、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 2757:2011EN 2757:2011 (E) 4 1 Scope This European Standard defines the general requirements for the determinati
17、on of drying residues (solid content) (Method A) and residues after ignition (corrosion inhibitor content) (Method B) of primers for aerospace applications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only th
18、e edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2642, Aerospace series Structural adhesive systems Adhesive film Technical specification1)3 Definitions and abbreviations See EN 2642. 4 Health and safety This standa
19、rd does not necessarily include all health and safety requirements, if any, associated with its use. Persons using this standard shall be familiar with normal laboratory/test house practices. It is the responsibility of the user to establish satisfactory health and safety practices and to ensure con
20、formity with any European, National and/or local laws or regulations. 5 Principle/Technique 5.1 Method A The drying residue (or solid content) is determined by weighing before and after a drying process, and is expressed as a percentage of initial weight. The drying residue contains the proportions
21、of all non volatile components of the primer, i.e. polymers and, in the case of corrosion inhibiting primers, inhibitors. 5.2 Method B The residue after ignition of corrosion inhibiting primers (corrosion inhibitor content) is determined by weighing the drying residue before and after a glowing proc
22、ess, and is expressed as a percentage of the drying residue. 1) Published as AECMA Prestandard at the date of publication of this standard BS EN 2757:2011EN 2757:2011 (E) 5 6 Resources 6.1 Apparatus/facilities/calibration Heat resistant crucible or container, resistant to the constituents of the pri
23、mer; Oven capable of maintaining a temperature of (200 5) C, with air circulation; Oven capable of maintaining a temperature of (595 15) C; Balance, with an accuracy of 1 mg; Dessicator. 6.2 Materials/reagents Drying agent: silica gel, phosphorus pentoxyde, 7 Test samples Primers which are stored at
24、 temperature below ambient shall be brought to this temperature in their original tightly closed containers. Shake or mix the primer in its original container before taking a sample. Three samples, approx. 5 grams to 10 grams are required for each determination of drying residue and residue after ig
25、nition. 8 Testing procedure Heat up the crucible to the constant mass point at a temperature 10 C higher than the drying temperature in 8.1.3 for drying residue determination, or than the ignition temperature in 8.2.1 if the residue after ignition is to be determined. Then cool the crucible to ambie
26、nt temperature in the dessicator fitted with the suitable drying agent. 8.1 Drying residue NOTE Use appropriate air extraction. 8.1.1 Weigh the crucible to the nearest milligram (m1). 8.1.2 Place the sample of primer in the crucible and weigh simultaneously to the nearest milligram (m2). 8.1.3 Dry t
27、he sample of primer to the constant mass point at the processing temperature defined in the relevant material standard. Care shall be taken during heat up to avoid boiling of the sample. 8.1.4 Cool the crucible and sample to ambient temperature in the dessicator, and weigh to the nearest milligram (
28、m3). 8.2 Residue after ignition Use the residue obtained in 8.1 for the determination of residue after ignition. BS EN 2757:2011EN 2757:2011 (E) 6 8.2.1 Heat the crucible and drying residue to the constant mass point at (595 15) C. 8.2.2 Cool to ambient temperature in the dessicator, and weigh to th
29、e nearest milligram (m4). 9 Expression of results 9.1 The drying residue of each sample is calculated according to the formula: 100%) (in residue drying2131=mmmm9.2 residue after ignition of each sample is calculated according to the formula: 100%) (in ignition after residue3141=mmmm10 Designation I
30、f necessary, the designation shall be as follows: EN 2757 A or B Number of this standard Method A (see 5.1) Method B (see 5.2) 11 Test report It shall include: reference to the test method standard; identification and traceability of the primer, in accordance with the technical specification; identi
31、fication and traceability of test samples; expression of results (individual and mean values); traceability of individual performing the test work; any incident which may have affected the results; any deviation from the test method standard; date of test. This page deliberately left blankBSI is the
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