1、September 2016 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 79.060.01!%$l“2560173www.din.d
2、eDIN EN ISO 12460-4Wood-based panels Determination of formaldehyde release Part 4: Desiccator method (ISO 12460-4:2016);English version EN ISO 12460-4:2016,English translation of DIN EN ISO 12460-4:2016-09Holzwerkstoffe Bestimmung der Formaldehydabgabe Teil 4: Exsikkator-Verfahren (ISO 12460-4:2016)
3、;Englische Fassung EN ISO 12460-4:2016,Englische bersetzung von DIN EN ISO 12460-4:2016-09Panneaux base de bois Dtermination du dgagement de formaldhyde Partie 4: Mthode au dessiccateur (ISO 12460-4:2016);Version anglaise EN ISO 12460-4:2016,Traduction anglaise de DIN EN ISO 12460-4:2016-09www.beuth
4、.deDocument comprises 15 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.08.16 DIN EN ISO 12460-4:2016-09 2 A comma is used as the decimal marker. National foreword This document (EN ISO 12460-4:2016) has been prepared by Techn
5、ical Committee ISO/TC 89 “Wood-based panels” in collaboration with Technical Committee CEN/TC 112 “Wood-based panels” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Holzwirtschaft und Mbel (DIN Standards Committee Timber and Furniture), W
6、orking Committee NA 042-02-15 AA Holzwerkstoffe Spiegelausschuss zu CEN/TC 112 und ISO/TC 89. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 16999 DIN EN 326-1 National Annex NA (informative) Bibliography DIN EN 326-1, Wood-based panels S
7、ampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12460-4 February 2016 ICS 79.060.01 English Version Wood-based panels - Determination of formaldehyde release - Part 4: Desiccator metho
8、d (ISO 12460-4:2016) Panneaux base de bois - 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 20
9、15. 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-to-date lists and bibliographical references concerning such national standards may be obtained
10、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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CEN
11、ELEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Ita
12、ly, Latvia, Lithuania, Luxembourg, Malta, 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: Ave
13、nue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12460-4:2016 EForeword 41 Scope .52 Normative references 53 Principle 54 Reagents 55 Apparatus .66 Test pieces .66.1 Sampling .66.2 Dimensions
14、.86.3 Number of test pieces .86.4 Number of emission tests 86.5 Conditioning 87 Procedure.87.1 Desiccator preparation 87.1.1 New desiccators87.1.2 Before each determination87.2 Test conditions 97.3 Positioning of the test pieces 97.4 Monitoring of test conditions .97.4.1 Temperature 97.4.2 Backgroun
15、d formaldehyde 97.5 Test duration .97.6 Sample collection 98 Determination of formaldehyde .98.1 General .98.2 Principle 98.3 Procedure .108.4 Calibration curve 108.4.1 General.108.4.2 Formaldehyde standard solution .108.4.3 Formaldehyde calibration solution .108.4.4 Determination of the calibration
16、 curve .118.5 Calculation of the concentration of formaldehyde in the glass crystallizing dish in the desiccator 119 Expression of results .1110 Test report 11Bibliography .13Contents PageEN ISO 12460-4:2016 (E) DIN EN ISO 12460-4:2016-09 2European foreword .3European foreword This document (EN ISO
17、12460-4:2016) 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 which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an
18、identical text or by endorsement, at the latest by August 2016, and conflicting national 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 he
19、ld responsible for identifying any or all such 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, Estoni
20、a, 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, Switzerland, Turkey and the United Kingdom. Endorsement notice The te
21、xt of ISO 12460-4:2016 has been approved by CEN as EN ISO 12460-4:2016 without any modification. EN ISO 12460-4:2016 (E) DIN EN ISO 12460-4:2016-09 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
22、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
23、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
24、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
25、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
26、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
27、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
28、: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
29、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)EN ISO 12460-4:2016 (E) DIN EN ISO
30、 12460-4:2016-09 4 1 ScopeThis part of ISO 12460 specifies a desiccator method for the determination of the quantity of formaldehyde emitted from particleboard, fibreboard, plywood, oriented strand board (OSB) and wooden laminated flooring.2 Normative referencesThe following documents, in whole or i
31、n 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 latest edition of the referenced document (including any amendments) applies.ISO 16999, Wood-based panels Sampling and cutt
32、ing 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 quantity of emitted formaldehyde absorbed in a specified volume of water during 24 h.4 ReagentsUse only reagents of recognize
33、d analytical grade, unless otherwise specified, and distilled or demineralized water or water of equivalent purity.4.1 Acetylacetone-ammonium acetate solution.Dissolve 150 g ammonium acetate (C2H3O2NH4) in 800 ml water in a 1 000 ml one-mark volumetric flask (5.9). Add 3 ml glacial acetic acid (C2H4
34、O2) 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. Discard the solution 3 days after preparation.4.2 Iodine standard solution, c(l2) = 0,05 mol/l.Standardize the solution before
35、 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 the solution before use.EN ISO 12460-4:2016 (E) DIN EN ISO 12460-4:2016-09 5 4.5 Sulfuric acid standard solution, c(H2SO4) =
36、 1 mol/l.Standardize the solution before use.4.6 Starch solution, 1 % mass fraction.5 ApparatusThe usual laboratory apparatus and, in particular, the following: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 1
37、5) 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, circular 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 desic
38、cator (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 desiccator (5.1) located adjacent to the desiccator(s) containing the test pieces.5.6 Spectrophotometer, capable of measuring absorbance at 412 n
39、m. 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 more 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
40、 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 Microburette 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 SamplingS
41、ampling and cutting of the test pieces shall be carried out in accordance with ISO 16999.EN ISO 12460-4:2016 (E) DIN EN ISO 12460-4:2016-09 6 Dimensions in millimetreFigure 1 Stainless steel wire grid for supporting the test pieces in the desiccatorKey1 supporting metal2 test piecesFigure 2 Example
42、of wire sample holder to hold the test pieces in the desiccatorEN ISO 12460-4:2016 (E) DIN EN ISO 12460-4:2016-09 7 6.2 DimensionsThe 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 dete
43、rmined by their total surface area. The sum of the areas of the ends, sides and faces shall be as close as possible to 1 800 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 differen
44、ces between emissions of the two tests shall be within 20 % of their arithmetic average, otherwise a third emission test 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
45、) C.Constant mass is considered to have been reached when the results of two successive weighing operations, carried out 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 tha
46、t air can circulate freely over all surfaces.Test pieces containing low levels of formaldehyde will absorb formaldehyde from 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
47、system or by maintaining low volumes of test pieces in the room. The background level is measured by exposing a glass crystallizing 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 no
48、minal emission level of the test pieces (e.g. for test pieces from a sample with expected emissions of 0,3 mg/l, the background 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 Befo
