1、BSI Standards PublicationBS EN ISO 12460-4:2016Wood-based panels Determination offormaldehyde releasePart 4: Desiccator methodBS EN ISO 12460-4:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO12460-4:2016.The UK participation in its preparation was entru
2、sted 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 necessaryprovisions of a contract. Users are responsible for its correctapplication. The British S
3、tandards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 85571 9ICS 79.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 201
4、6.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN ISO 12460-4 February 2016 ICS 79.060.01 English Version Wood-based panels - Determination of formaldehyde release - Part 4: Desiccator method (ISO 12460-4:2016) Panneaux base de bois
5、 - Dtermination du dgagement de formaldhyde - Partie 4: Mthode au dessiccateur (ISO 12460-4:2016) Holzwerkstoffe - Bestimmung der Formaldehydabgabe - Teil 4: Exsikkator-Verfahren (ISO 12460-4:2016) This European Standard was approved by CEN on 26 December 2015. CEN members are bound to comply with t
6、he CEN/CENELEC Internal Regulations which stipulate 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 CEN-CENELEC Manageme
7、nt 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status
8、 as the official versions. CEN members are the national standards bodies of 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, Malta,
9、Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN Al
10、l rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12460-4:2016 EBS EN ISO 12460-4:2016EN ISO 12460-4:2016 (E) 3 European foreword This document (EN ISO 12460-4:2016) has been prepared by Technical Committee ISO/TC 89 “Wood-based panels
11、“ in collaboration with Technical Committee CEN/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 August 2016, and conflicting nat
12、ional standards shall be withdrawn at the latest by August 2016. 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 such patent rights. According to the CEN-
13、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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary
14、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 12460-4:2016 has been approved by CEN as EN ISO 12460-4:2016 without any
15、modification. BS EN ISO 12460-4:2016ISO 12460-4:2016(E)Foreword iv1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 26 Test pieces . 26.1 Sampling . 26.2 Dimensions . 46.3 Number of test pieces . 46.4 Number of emission tests 46.5 Conditioning 47 Procedure. 47.1 Desiccator pr
16、eparation 47.1.1 New desiccators 47.1.2 Before each determination 47.2 Test conditions 57.3 Positioning of the test pieces 57.4 Monitoring of test conditions . 57.4.1 Temperature 57.4.2 Background formaldehyde 57.5 Test duration . 57.6 Sample collection 58 Determination of formaldehyde . 58.1 Genera
17、l . 58.2 Principle 58.3 Procedure 68.4 Calibration curve . 68.4.1 General 68.4.2 Formaldehyde standard solution 68.4.3 Formaldehyde calibration solution 68.4.4 Determination of the calibration curve 78.5 Calculation of the concentration of formaldehyde in the glass crystallizing dish in the desiccat
18、or . 79 Expression of results 710 Test report . 7Bibliography 9 ISO 2016 All rights reserved iiiContents PageBS EN ISO 12460-4:2016ISO 12460-4:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
19、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 that committee. International organizations, governmental and non-government
20、al, 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 document and those intended for its further maintenance are described in the I
21、SO/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 Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibi
22、lity 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 of the document will be in the Introduction and/or on the ISO list of p
23、atent 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 specific terms and expressions related to conformity assessment, as well as in
24、formation 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.This second edition cancels and replaces the first edition (ISO 12460-4
25、:2008), which has been technically revised with the following changes:a) introduction was deleted;b) reference to JANS 16 was deleted in the scope;c) provisions for low emitting boards were added in 5.6.It also incorporates the Amendment ISO 12460-4:2008/Amd 1:2011.ISO 12460 consists of the followin
26、g parts, under the general title Wood-based panels Determination of formaldehyde release: Part 1: Formaldehyde emission by the 1-cubic-metre chamber method Part 3: Gas analysis method Part 4: Desiccator method Part 5: Extraction method (called the perforator method)iv ISO 2016 All rights reservedBS
27、EN ISO 12460-4:2016INTERNATIONAL STANDARD ISO 12460-4:2016(E)Wood-based panels Determination of formaldehyde release Part 4: Desiccator method1 ScopeThis part of ISO 12460 specifies a desiccator method for the determination of the quantity of formaldehyde emitted from particleboard, fibreboard, plyw
28、ood, oriented strand board (OSB) and wooden laminated flooring.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the
29、latest edition of the referenced document (including any amendments) applies.ISO 16999, Wood-based panels Sampling and cutting of test pieces3 PrincipleEmission of formaldehyde is determined by placing test pieces of known surface area in a desiccator at a controlled temperature and measuring the qu
30、antity of emitted formaldehyde absorbed in a specified volume of water during 24 h.4 ReagentsUse only reagents of recognized analytical grade, unless otherwise specified, and distilled or demineralized water or water of equivalent purity.4.1 Acetylacetone-ammonium acetate solution.Dissolve 150 g amm
31、onium acetate (C2H3O2NH4) in 800 ml water in a 1 000 ml one-mark volumetric flask (5.9). Add 3 ml glacial acetic acid (C2H4O2) and 2 ml acetylacetone (pentane-2,4-dione, C5H8O2) and mix thoroughly into the solution. Make up to the mark with water. During storage, protect the solution from light. Dis
32、card the solution 3 days after preparation.4.2 Iodine standard solution, c(l2) = 0,05 mol/l.Standardize the solution before use.4.3 Sodium thiosulfate standard solution, c(Na2S2O3) = 0,1 mol/l.Standardize the solution before use.4.4 Sodium hydroxide standard solution, c(NaOH) = 1 mol/l.Standardize t
33、he solution before use. ISO 2016 All rights reserved 1BS EN ISO 12460-4:2016ISO 12460-4:2016(E)4.5 Sulfuric acid standard solution, c(H2SO4) = 1 mol/l.Standardize the solution before use.4.6 Starch solution, 1 % mass fraction.5 ApparatusThe usual laboratory apparatus and, in particular, the followin
34、g:5.1 Glass desiccators, with an enclosed volume of (11 2) l capable of enclosing a support (5.2).5.2 Wire grid or support, of diameter (240 15) mm of stainless steel wire such that the distance between parallel pieces of wire is not less than 15 mm (see Figure 1).5.3 Glass crystallizing dish, circu
35、lar of inside diameter (115 1) mm and depth (60 2) mm.5.4 Sample holder, of stainless steel wire, to hold the test pieces upright in the desiccator (see Figure 2).5.5 Temperature-measuring device, e.g. a thermocouple, capable of measuring temperature with an error limit of 0,1 C, placed inside a des
36、iccator (5.1) located adjacent to the desiccator(s) containing the test pieces.5.6 Spectrophotometer, capable of measuring absorbance at 412 nm. The use of cells of pathlength at least 50 mm is recommended and is required for low emitting boards. Fluorometric determination can also be used to gain m
37、ore sensitivity.5.7 Water bath, capable of maintaining a temperature of (65 2) C.5.8 Volumetric flasks, six, of capacity 100 ml.5.9 Volumetric flasks, two, of capacity 1 000 ml.5.10 Bulb pipettes, of capacities 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 50 ml, and 100 ml or suitable auto pipette.5.11 Microbu
38、rette or auto dispenser.5.12 Flasks with stoppers, of capacity 100 ml.5.13 Balance, capable of measuring to 0,001 g.6 Test pieces6.1 SamplingSampling and cutting of the test pieces shall be carried out in accordance with ISO 16999.2 ISO 2016 All rights reservedBS EN ISO 12460-4:2016ISO 12460-4:2016(
39、E)Dimensions in millimetreFigure 1 Stainless steel wire grid for supporting the test pieces in the desiccatorKey1 supporting metal2 test piecesFigure 2 Example of wire sample holder to hold the test pieces in the desiccator ISO 2016 All rights reserved 3BS EN ISO 12460-4:2016ISO 12460-4:2016(E)6.2 D
40、imensionsThe test pieces, of thickness, , in millimetres, shall be of length (150 1,0) mm and of width (50 1,0) mm.6.3 Number of test piecesThe number of test pieces shall be determined by their total surface area. The sum of the areas of the ends, sides and faces shall be as close as possible to 1
41、800 cm2.6.4 Number of emission testsThe emission tests shall be carried out in duplicate.NOTE For internal routine control, a single emission test might be sufficient.The differences between emissions of the two tests shall be within 20 % of their arithmetic average, otherwise a third emission test
42、shall be carried out.6.5 ConditioningCondition the test pieces for 7 days or to constant mass in an atmosphere with a mean relative humidity of (65 5) % and a temperature of (20 2) C.Constant mass is considered to have been reached when the results of two successive weighing operations, carried out
43、at an interval of 24 h, do not differ by more than 0,1 % of the mass of the test piece.The test pieces to be conditioned shall be separated by at least 25 mm and positioned so that air can circulate freely over all surfaces.Test pieces containing low levels of formaldehyde will absorb formaldehyde f
44、rom the atmosphere when background levels of formaldehyde are high. Care should be taken to avoid such conditions during storage and conditioning by use of a formaldehyde removal system or by maintaining low volumes of test pieces in the room. The background level is measured by exposing a glass cry
45、stallizing dish (5.3) containing 300 ml water to the conditioning atmosphere for 24 h, and analysing the resulting solution. The maximum background level shall be less than the nominal emission level of the test pieces (e.g. for test pieces from a sample with expected emissions of 0,3 mg/l, the back
46、ground levels should be less than 0,3 mg/l).7 Procedure7.1 Desiccator preparation7.1.1 New desiccatorsThoroughly clean new desiccators and those previously used for purposes other than the determination of formaldehyde.7.1.2 Before each determinationRinse the desiccator (5.1) and the glass dish (5.3
47、) with water and dry them before each determination. Place (300 1) ml of water at (20 1) C in the glass dish (5.3), and locate it centrally at the bottom of the desiccator. Position the wire mesh support (5.2) above the glass dish within the desiccator.4 ISO 2016 All rights reservedBS EN ISO 12460-4
48、:2016ISO 12460-4:2016(E)7.2 Test conditionsPlace the desiccator on a vibration-free surface in an environment capable of maintaining the air temperature inside the desiccator at (20 0,5) C.7.3 Positioning of the test piecesInsert the test pieces, free of any loose particles, into the wire sample hol
49、der (5.4) before placing it inside the desiccator. Position the sample holder containing the test pieces inside the desiccator at the centre of the wire mesh support so that it is located directly above the glass dish.7.4 Monitoring of test conditions7.4.1 TemperaturePrepare a control desiccator (5.1) as specified in 7.1.2 but containing no test pieces, and fit it with a temperature-measuring device (5.5). Monitor the temperature inside the desiccator continuously, or at intervals not exceeding 15 min, and re
