1、BSI Standards PublicationBS EN ISO 12460-5:2015W o o d - b a s e d p a n e l s Determination offormaldehyde releasePart 5: Extraction method (called theperforator method)BS EN ISO 12460-5:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 12460-5:2015.It s
2、upersedes BS EN 120:1992 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/541, Wood based panels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the neces
3、saryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84140 8ICS 79.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was p
4、ublished under the authority of theStandards Policy and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12460-5 December 2015 ICS 79.060.01 Supersedes EN 120:1992English Version
5、Wood-based panels - Determination of formaldehyde release - Part 5: Extraction method (called the perforator method) (ISO 12460-5:2015) Panneaux base de bois - Dtermination du dgagement de formaldhyde - Partie 5 : Mthode dextraction (dite mthode au perforateur) (ISO 12460-5:2015) Holzwerkstoffe - Be
6、stimmung der Formaldehyabgabe -Teil 5: Extraktionsverfahren (genannt Perforatormethode) (ISO 12460-5:2015) This European Standard was approved by CEN on 29 August 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S
7、tandard 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (Eng
8、lish, 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,
9、 Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerlan
10、d, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Memb
11、ers. Ref. No. EN ISO 12460-5:2015 EBS EN ISO 12460-5:2015EN ISO 12460-5:2015 (E) 3 European foreword This document (EN ISO 12460-5:2015) has been prepared by Technical Committee ISO/TC 89 “Wood-based panels” in collaboration with Technical Committee CEN/TC 112 “Wood-based panels” the secretariat of
12、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 June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibi
13、lity 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 such patent rights. This document supersedes EN 120:1992. According to the CEN-CENELEC Internal Regulations, the national standards organiz
14、ations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma
15、lta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 12460-5:2015 has been approved by CEN as EN ISO 12460-5:2015 without any modification. BS EN ISO 12460-5:2015ISO 12460-5:2015(E)Forew
16、ord ivIntroduction vi1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 16 Test pieces . 36.1 General . 36.2 Sampling . 36.3 Sampling for factory production control 36.4 Sampling for other purposes 37 Procedure. 37.1 Number of extractions 37.2 Determination of moisture content
17、 37.3 Extraction in the perforator . 47.4 Blank test . 47.5 Determination of formaldehyde in the extract 47.5.1 General 47.5.2 Principle 57.5.3 Reagents 57.5.4 Analytical procedure 57.5.5 Calibration curve . 57.6 Quality assurance 68 Expression of results 78.1 Moisture content . 78.2 Perforator valu
18、e . 79 Test report . 8Annex A (normative) Perforator extraction efficiency test Calibration of the perforator method .13Bibliography .14 ISO 2015 All rights reserved iiiContents PageBS EN ISO 12460-5:2015ISO 12460-5:2015(E)ForewordISO (the International Organization for Standardization) is a worldwi
19、de federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on tha
20、t committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this docum
21、ent and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directive
22、s, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development
23、 of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specifi
24、c terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 89, Wood-based panels.
25、This second edition cancels and replaces the first edition (ISO 12460-5:2011), which has been technically revised.The objective of the revision was to improve the detection limit and the reproducibility of the method with regard to boards with low formaldehyde content.Compared to ISO 12460-5:2011, t
26、he following modifications have been made:a) in 5.3 recommendation of cell length for low emitting samples is added;b) in 6.4 relative humidity for conditioning climate is increased to (65 5) %;c) in 7.1 and 8.2 procedure and evaluation of third extraction are modified;d) in 7.3 accuracy of weighing
27、 of test pieces enhanced and higher mass of the test pieces is added as an option for low emitting boards;e) in 7.4 precision of blank test is improved;f) in 7.5.1 fluorimetric determination of formaldehyde is added an option;g) in 7.5.4 temperature of water bath is increased to 60 C;h) in 8.2 modif
28、ication factors for moisture content is included;i) in Figure 4 calibration curve is modified;j) Annex A for calibration and quality assurance is added.ISO 12460 consists of the following parts, under the general title Wood-based panels Determination of formaldehyde release: Part 1: Formaldehyde emi
29、ssion by the 1-cubic-metre chamber methodiv ISO 2015 All rights reservedBS EN ISO 12460-5:2015ISO 12460-5:2015(E) Part 3: Gas analysis method Part 4: Desiccator method Part 5: Extraction method (called the perforator method)Additional parts dealing with small-scale chamber method is planned. ISO 201
30、5 All rights reserved vBS EN ISO 12460-5:2015ISO 12460-5:2015(E)IntroductionThe “perforator value” as determined by the method laid down in this part of ISO 12460 is considered to be the “formaldehyde content” of the tested board.The test results are dependent on the specific board conditions at the
31、 time of testing.The emission of formaldehyde from wood-based panels (e.g. particleboard, plywood, fibreboard, OSB) 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 th
32、e perforator value and the formaldehyde emission of the board depends on the type of board.vi ISO 2015 All rights reservedBS EN ISO 12460-5:2015INTERNATIONAL STANDARD ISO 12460-5:2015(E)Wood-based panels Determination of formaldehyde release Part 5: Extraction method (called the perforator method)1
33、ScopeThis part of ISO 12460 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 referencesThe following documents, in whole or in part, are normatively referenced in th
34、is document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 16979, Wood-based panels Determination of moisture contentISO 16999, Wood-based pa
35、nels Sampling and cutting of test pieces3 PrincipleThe formaldehyde is extracted from test pieces by means of boiling toluene and then transferred into distilled or demineralized water. The formaldehyde content of this aqueous solution is determined photometrically by the acetylacetone method.4 Reag
36、entsFor the analysis, only reagents of analytical quality and distilled or demineralized water shall be 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.4.4 Formaldehyde s
37、olution.Commercially available formaldehyde solution (concentration typically between 35 % mass fraction to 40 % mass fraction).5 Apparatus5.1 Precision balance, with 0,01 g scale intervals.5.2 Well-ventilated oven, capable of maintaining a temperature of (103 2) C. ISO 2015 All rights reserved 1BS
38、EN ISO 12460-5:2015ISO 12460-5:2015(E)5.3 Spectrophotometer, capable of measuring absorbance at 412 nm. A cell of 50 mm path length is recommended, especially for low emitting samples.5.4 Extraction apparatus.The apparatus consists of the following: spiral condenser (Dimroth cooler), total length: a
39、pproximately 400 mm, cone 45/40, socket 29/32 (item reference 2); conical adaptor, socket 45/40, cone 71/51 (item reference 3); filter insert, porosity P 160 (100 pm to 160 pm), bowl and filter diameters: 60 mm (item reference 4); perforator attachment, 1 000 ml, with stopcock (4 mm bore), socket 71
40、/51, cone 29/32 (item reference 5); conical adaptor, socket 29/32, cone 45/40 (item reference 8); 1 000 ml round bottom flask, socket 45/40 (item reference 9); (double) bulbed tube, cone 29/32 (length: approximately 380 mm), external diameter: approximately 10 mm, bulb diameter: approximately 50 mm,
41、 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 ml) (item reference 7); heating mantle (item reference 10).The item references are given in Figure 1. Details of the appar
42、atus are shown in Figure 2 and Figure 3.Permanent PTFE seals should be used rather than paraffin or silicone grease sealants.5.5 Laboratory equipment.The apparatus consists of the following: volumetric flask, 2 000 ml, calibrated at 20 C; conical flask, 250 ml; precision burette, 50 ml, calibrated a
43、t 20 C; watch glass, with diameter of about 120 mm; two volumetric flasks, 1 000 ml, calibrated at 20 C; six volumetric flasks, 100 ml, calibrated at 20 C; volumetric pipette, 100 ml, calibrated at 20 C; volumetric pipette, 25 ml, calibrated at 20 C; volumetric pipettes (calibrated at 20 C), 1 ml, 2
44、 ml, 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 50 ml, 100 ml; three volumetric pipettes, 10 ml, calibrated at 20 C; stoppered flasks, each 50 ml; two volumetric cylinders, 250 ml; water bath, capable of maintaining a temperature of (60 1) C; water bath, capable of maintaining a temperature in the range of 2
45、0 C to 25 C;2 ISO 2015 All rights reservedBS EN ISO 12460-5:2015ISO 12460-5:2015(E) desiccator.6 Test pieces6.1 GeneralSampling and cutting are done in accordance with ISO 16999.6.2 Sampling6.2.1 The test pieces are to be taken and evenly distributed over the width of the (cooled) board, but excludi
46、ng a 250 mm wide strip from the end of each board.6.2.2 Take 12 test pieces of 25 mm 25 mm thickness of the board for the determination of the moisture content and a sufficient number of test pieces of the same dimensions to obtain approximately 500 g of the board for the extraction by perforator.6.
47、3 Sampling for factory production controlIf this method is used for production control, the board selected for sampling is immediately cut up after cooling. The test pieces taken from the board are to be stored hermetically sealed at room temperature.The formaldehyde determination should be carried
48、out not more than 72 h after sampling.6.4 Sampling for other purposesIf this method is used for other purposes, e.g. for boards already installed, the method chosen for sampling, preparation of test pieces, and conditioning, all which influence the final result, shall be agreed between the parties a
49、nd indicated in the test report.Unless otherwise agreed, the test pieces shall be conditioned to constant mass at a temperature of (20 2) C and a relative humidity of (65 5) %.Constant mass is considered to have been reached when the results of two successive weighings carried out at intervals of not less than 24 h do not differ by more than 0,1 % of the mass of the test pieces.Contamination of test pieces from other sources of formaldehyde during conditioning shall be avoided.7 Procedu
