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1、CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat rue de Stassart 36 B 1050 Brussels 1996 Copyright reserved to CEN members Ref No EN 717 3 1996 E EUROPEAN STANDARDEN 717 3 NORME EUROPE ENNE EUROPA ISCHE NORM March 199
2、6 ICS 79 060 20 Descriptors Wood products wooden boards determination emission formaldehyde analysis methods English version Wood based panels Determination of formaldehyde release Part3 Formaldehyde release by the flask method Panneaux a base de bois De termination du de gagement de formalde hyde P
3、artie 3 De gagement de formalde hyde par la me thode au bocal Holzwerkstoffe Bestimmung der Formaldehydabgabe Teil 3 Formaldehydabgabe nach der Flaschen Methode This European Standard was approved by CEN on 1995 12 22 CEN members are bound to comply with the CEN CENELEC Internal Regulations which st
4、ipulate 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 application to the Central Secretariat or to any CEN member This European Standard e
5、xists in three official versions English French German A version in any other language made by translation under the 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
6、 of Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland and United Kingdom Page 2 EN 717 3 1996 BSI 1996 1 At present at the draft stage Foreword This European Standard has been prepared by Technical Committee CE
7、N TC 112 Wood based panels the Secretariat of which is held by DIN 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of an identical text or by endorsement at the latest by September 1996 and conflicting national standards shall be withdrawn at the latest
8、by September 1996 This standard is one of a series which specifies methods for determining formaldehyde potential in or formaldehyde release from wood based panels The other standards in this series are EN 120Wood based panels Determination of formaldehyde content Extraction method called the perfor
9、ator method EN 717 1Wood based panels Determination of formaldehyde release Part 1 Formaldehyde release by the chamber method1 EN 717 2Wood based panels Determination of formaldehyde release Part 2 Formaldehyde release by the gas analysis method No existing European Standard is superseded According
10、to the CEN CENELEC Internal Regulations the national standards organizations of 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 Un
11、ited Kingdom Contents Page 1Scope3 2Normative references3 3Principle3 4Reagents3 5Apparatus3 6Test pieces4 7Procedure5 8Expression of results7 9Test report7 Page 3 EN 717 3 1996 BSI 1996 Introduction The principle of the flask method for measuring the formaldehyde release has been published by Wilhe
12、lm Klauditz Institute Roffael 1975 Thereafter the method has been modified in different ways by many authors in several countries After consideration of published work focusing on the method and its reliability a temperature of 40 C and a period of 3 h have been selected for this standard 1 Scope Th
13、is European Standard specifies a method known as the flask method for determination of formaldehyde release from uncoated wood based panels 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications These normative references are cited
14、 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 latest edition of
15、the publication referred to applies EN 322Wood based panels Determination of moisture content EN 323Wood based panels Determination of density EN 326 1Wood based panels Sampling cutting and inspection Part 1 Sampling and cutting of test pieces and expression of test results 3 Principle Formaldehyde
16、release is determined by suspending test pieces of known mass over water in a closed container maintained at a constant temperature Formaldehyde released from the test pieces during a defined period of time is absorbed by the water The formaldehyde content of the water is determined photometrically by the acetylacetone method and the result is expressed in milligrams formaldehyde per kilogram of dry board 4 Reagents 4 1 General Reagents of recognized analytical purity and distilled or deminerali
