EN 120-1992 en Wood Based Panels - Determination of Formaldehyde Content - Extraction Method Called the Perforator Method《木基板 甲醛含量的测定 称为钻孔法的萃取法》.pdf
《EN 120-1992 en Wood Based Panels - Determination of Formaldehyde Content - Extraction Method Called the Perforator Method《木基板 甲醛含量的测定 称为钻孔法的萃取法》.pdf》由会员分享,可在线阅读,更多相关《EN 120-1992 en Wood Based Panels - Determination of Formaldehyde Content - Extraction Method Called the Perforator Method《木基板 甲醛含量的测定 称为钻孔法的萃取法》.pdf(13页珍藏版)》请在麦多课文档分享上搜索。
1、CEN EN*L20 92 3404589 003LOb9 362 = EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 120:1992 July 1992 UDC 674.81 5: 620.1 : 543.242.3: 547.281 1 Supersedes EN 120:1984 Descriptors: Wooden boards, particle bbards, fibre boards, plywood, chemical analysis, determination of content, gxtraction me
2、thods, perforators English version Wood based panels - Determination of formaldehyde content - Extraction. method called the perforator method Panneaux base de bois - Dtermination de la teneur en formaldhyde - Mthode dextraction dite dthcde au perforateur Holzwerkstoffe - Bestimmung des Formaldehydg
3、ehalts - Extrationsverfahren genannt Perforatorrnethode This European Standard was approved by CEN on 1992-07-01. 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 a
4、lteration. 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. The European Standards exist in three official versions (English, French, German). A version in any other language made by tra
5、nslation 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 of Austria, Belgium, Denmark, Finiad, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
6、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdm. CEN European Cornnittee for Standardization Comit Europen de Normalisation Europisches Kanitee fr Nomng Central Secretariat: rue de Slassart,3 8-1050 Emssels o 1992 Copyright reserved to CEN members Ref. No. EN 120:1992
7、 E Page 2 EN 120:1992 - CEN ENJL20 92 = 3404589 003L070 U84 M Contents list Page scope . Normative references Principle . Reagents Apparatus :. . Test pieces . Procedure . Expression of results . Test report . 4 4 4 4- 4 5 6 9 9 - I CEN EN*lIZCI 92 3404589 003L07 T10 = This European (Secretariat : (
8、Secretariat : Page 3 EN 120:1992 Foreword -. - 4 Standard was prepared by Working Group 5 “Formaldehyde“ . Germany) of Technical Committee CEN/TC 112 “Wood-based panels“ Germany). This European Standard is based on the October 1984 edition. To that times the work was the responsibility of CEN/TC 91
9、Particleboards - Formaldehyde“ and it was only intented for determining the formaldehyde content of particleboards. The basis was an extraction method developed by the European Federation of Associations of Particleboard Manufacturers, FESYP, and known as the “Perforator Method“. This method was int
10、ented for testing particularly particleboards at the manufacturing stage, and was later adapted for testing all wood-based panels. For this European standard a mandate “Timber Structures“ has been given to CEN and EFTA in the framework of the Directive on the approximation of laws, regulations and a
11、dministrative provisions of the Member States relating to construction products (89/106/EEC). National Standards identicalto this European Standard shall be published at the latest by 93-01-31 and conflicting national standards shall be withdrawn at the lbtest by 93-01-31. In accordance with the Com
12、mon CEN/CENELEC Rules 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. Introduction The “perforat
13、or value“ as determined by the method laid down in this standard is considered to be the “formaldehyde content“ of the tested board. The test results shall be considered in relation to the specific board conditions at the time of testing. The emission of formaldehyde from wood-based panels (e.g. par
14、ticleboard, plywood, fibreboard) is a complex process. For a given board, the test result depends upon the age, ageing conditions, moisture content etc., at the time of testing. In addition, the correlation between the perforator value and the formaldehyde emission of the board depends on the type o
15、f board. CEN EN*l120 92 0 3404589 0033072 957 Page 4 EN 120:1992 1 Scope This European Standard specifies an extraction method, known as the “Perforator Method“. It is used for the determination of the formaldehyde content of unlaminated and uncoated wood-based panels. 2 Normative references This Eu
16、ropean Standard incorporates by dated or undated reference, provision from-other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated reference, subsequent amendments to or revisions of any Of these publications
17、 apply to this European Standard only when incorPoratGd .in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 322 Wood-based panels - Determination of moisture content 3 Principle The formaldehyde is extracted from test pieces by means
18、of boiling toluene and then transferred into distilled or demineralized water. The formaldehyde content of this aqueous solution is determined photo- metrically by the acetylacetone method. 4 Reagents For the analysis, only reagents of analytical quality and distilled or demineralized water shall be
19、 used. 4.1 Toluene, which is free from water and from impurities which may interfere with the test. 4.2 Acetylacetone of analytical grade 4.3 Ammonium acetate of analytical grade NOTE: valent result. Commercially prepared solutions may be used, provided it can be shown that they give an equi- .5 App
20、aratus 5.1 Precision balance, scale interval 0,001 g. 5.2 Well ventilated drying oven, capable of maintaining a temperature of (103 f 2) *C 5.3 Spectrophotometer 5.4 Extraction apparatus The apparatus consists of: - Spiral Condenser, total length approximately 400 mm, cone 45/40, socket 29/32 (item
21、reference 2) - Conical adaptor, socket 45/40, cone 71/51 (item reference 3) - Filter insert, porosity P 160 (100 pm to 160 vm), bowl and filter diameter 60 mm - Perforator attachment 1000 ml with stopcock (4 mm bore), socket 71/51, cone 29/32 - Conical adaptor, socket 29/32, cone 45/40 (item referen
22、ce 8) - 1000 ml round-bottomed flask, socket 45/40 (item reference 9) i tem reference (item reference CEN EN*lt20 72 E 3404589 0031373 893 E Page 5 EN 120:1992 - (Double) bulbed tube, cone 29/32 (length approximately 380 mm), external diameter approximately 10 mm, bulb diameter approximately 50 mm,
23、distance between bulb and bottom end of tube approximately 200 mm (distance between the bulbs approximately 50 mm) (item reference 6) - Absorption bulb (e. g. conical flask 250 mi) (item reference 7). NOTE: The-item references are given in figure 1. 5.5 Laboratory equipment . - Volumetric flask 2000
24、 ml, calibi.ated:_at. 20 *C - Conical flask, 250 ml - Precision burette, 50 ml, calibrated at 20 *C - Watch glass with diameter of about 120 mm - Two volumetric flasks, 1000 ml, calibrated at 20 C - Six volumetric flasks, 700 ml, calibrated at 20 *C - Bulb pipette, 100 ml, calibrated at 20 *C - Bulb
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