1、BSI Standards PublicationBS EN ISO 12460-3:2015Wood-based panels Determination offormaldehyde releasePart 3: Gas analysis methodBS EN ISO 12460-3:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 12460-3:2015. It supersedes BS EN 717-2:1995 which is withd
2、rawn.The UK participation in its preparation was entrusted to Technical Committee B/541, Wood based panels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users
3、are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84139 2 ICS 79.060.01 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of
4、the Standards Policy and Strategy Committee on 30 November 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 12460-3 November 2015 ICS 79.060.01 Supersedes EN 717-2:1994English Version Wood-based panels - Determina
5、tion of formaldehyde release - Part 3: Gas analysis method (ISO 12460-3:2015)Panneaux base de bois - Dtermination du dgagement de formaldhyde - Partie 3: Mthode danalyse de gaz (ISO 12460-3:2015) Holzwerkstoffe - Bestimmung der Formaldehydabgabe - Teil 3: Gasanalyse-Verfahren (ISO 12460-3:2015) This
6、 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 Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referenc
7、es 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 (English, French, German). A version in any other language made by translation under the responsibility of a CEN me
8、mber 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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, F
9、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, 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
10、 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 Members. Ref. No. EN ISO 12460-3:2015 EBS EN ISO 12460-3:2015EN ISO 12460-3:2015 (E) 3 European foreword This docu
11、ment (EN ISO 12460-3:2015) has been prepared by Technical Committee ISO/TC 89 “Wood-based panels” in collaboration with Technical Committee CEN/TC 112 “Wood-based panels” thesecretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by public
12、ation of anidentical text or by endorsement, at the latest by May 2016, and conflicting national standards shall bewithdrawn at the latest by May 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CEN and/or CENELEC shall not be
13、 held responsible for identifying any or all such patentrights. This document supersedes EN 717-2:1994. According to the CEN-CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,Croatia,
14、 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, Switzerland,Turkey and the Unit
15、ed Kingdom.Endorsement notice The text of ISO 12460-3:2015 has been approved by CEN as EN ISO 12460-3:2015 without anymodification. BS EN ISO 12460-3:2015ISO 12460-3:2015(E)Foreword iv1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 25.1 Main composites of test apparatus (se
16、e Figure 1) . 25.2 Laboratory equipment . 26 Sampling and preparation of test pieces . 36.1 Preparation of test pieces 36.2 Selection of test pieces for factory production control 36.3 Selection of test pieces for other purposes 46.4 Selection of test pieces in case of dispute 47 Procedure. 47.1 Num
17、ber of determinations . 47.2 Determination of moisture content 47.3 Determination of formaldehyde release . 47.4 Determination of formaldehyde content of the aqueous solutions . 57.4.1 General 57.4.2 Principle 57.4.3 Analytical Procedure 57.4.4 Calibration curve . 58 Expression of results 78.1 Gas a
18、nalysis value . 78.2 Calculation of results . 78.2.1 Calculation of results of test pieces . 78.2.2 Calculation of emission report value 88.3 Moisture content . 89 Test report . 8Bibliography .11 ISO 2015 All rights reserved iiiContents PageBS EN ISO 12460-3:2015ISO 12460-3:2015(E)ForewordISO (the I
19、nternational Organization for Standardization) is a worldwide 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
20、has been established has the right to be represented on that 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 electrotechnica
21、l standardization.The procedures used to develop this document 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 a
22、ccordance with the editorial rules of the ISO/IEC Directives, 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. Det
23、ails of any patent rights identified during the development 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 e
24、ndorsement.For an explanation on the meaning of ISO specific 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 res
25、ponsible for this document is ISO/TC 89, Wood-based panels.This second edition cancels and replaces the first edition (ISO 12460-3:2008), 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 wi
26、th low formaldehyde content.Compared to ISO 12460-3:2008, the following modifications have been made:a) in 6.1 preparation of test pieces is described more in detail;b) in 6.2 recommendation of maximum time 72 h after sampling for formaldehyde determination is added;c) in 6.4 conditioning for sampli
27、ng and testing in case of dispute is added;d) in 7.1 and 8.2.2 procedure and evaluation of third determination are modified;e) in 7.3 use of smaller gas wash bottles and volumetric flasks to improve the sensitivity is included as an option;f) in 7.4.3 the use of a mixed reagent is included as an opt
28、ion to reduce the amounts of aqueous solution and hence improve the sensitivity;g) in 7.4.3 temperature of water bath increased to 60 C and cooling procedure is modified;h) in 7.4.4.1 minimum interval of check of the calibration curve is extended to once a month;i) in Clause 9 age and treatment of t
29、he sample are included in the test report;j) in Figure 2 calibration curve is modified.ISO 12460 consists of the following parts, under the general title Wood-based panels Determination of formaldehyde release:iv ISO 2015 All rights reservedBS EN ISO 12460-3:2015ISO 12460-3:2015(E) Part 1: Formaldeh
30、yde 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)Additional parts dealing with small-scale chamber method is planned. ISO 2015 All rights reserved vBS EN ISO 12460-3:2015BS EN ISO 12460-3:20
31、15Wood-based panels Determination of formaldehyde release Part 3: Gas analysis method1 ScopeThis part of ISO 12460 specifies a procedure for determination of accelerated formaldehyde release from uncoated and coated wood-based panels using the gas analysis method. The procedure is also suitable for
32、the testing of other materials (e.g. edge bands, floor coverings, foams, foils, laminated wood products, veneered wood products, coated wood products).2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applica
33、tion. 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 panels Sampling and cutting of test pieces3 Princip
34、leA test piece of known surface area is placed in a closed chamber in which the temperature, humidity, airflow, and pressure are controlled to defined values. Formaldehyde released from the test pieces mixes with the air in the chamber. This air is continually drawn from the chamber and passes throu
35、gh gas wash bottles, containing water, which absorbs the released formaldehyde. At the end of the test, the formaldehyde concentration is determined photometrically or fluorimetrically. The formaldehyde release is calculated from this concentration, the sampling time, and the exposed area of the tes
36、t pieces and is expressed in milligrams per square meter and hour (mg/m2h).4 ReagentsReagents of recognized analytical purity and distilled or demineralised water (referred throughout the following text as distilled water) shall be used for the analysis.4.1 4 ml Acetylacetone solution are added to a
37、 1 000 ml volumetric flask and made up to the mark with distilled water.4.2 200 g ammonium acetate solution are dissolved with distilled water in a 1 000 ml volumetric flask and made up to the mark. Optionally, a premixed reagent of acetylacetone and ammonium acetate as described in ISO 12460-4 can
38、be used.4.3 Formaldehyde solution commercially available (concentration typically between 35 % mass fraction to 40 % mass fraction).INTERNATIONAL STANDARD ISO 12460-3:2015(E) ISO 2015 All rights reserved 1BS EN ISO 12460-3:2015ISO 12460-3:2015(E)4.4 Standard iodine solution c(l2) = 0,05 mol/l4.5 Sta
39、ndard sodium thiosulphate solution c(Na2S2O3) = 0,1 mol/l4.6 Standard sodium hydroxide solution c(NaOH) = 1 mol/l4.7 Standard sulphuric acid solution c(H2SO4) = 1 mol/l4.8 Starch solution 1 % by mass5 Apparatus5.1 Main composites of test apparatus (see Figure 1)5.1.1 Air filter (1).5.1.2 Wash bottle
40、, 500 ml, containing ca. 400 ml distilled water (2).5.1.3 Desiccator, 500 ml, containing silica gel (3).5.1.4 Air pump (4).5.1.5 Needle valve (5).5.1.6 Equipment for measuring rate of air flow through apparatus (6).5.1.7 Test chamber (diameter: 90 mm to 100 mm with a length which gives an internal v
41、olume of (4 000 200) ml with double casing of stainless steel or glass (7).5.1.8 Heating equipment for air (e.g. copper coil inside the double casing) (8).5.1.9 Thermostat (9).5.1.10 Magnetic valves (10).5.1.11 4 pairs of gas wash bottles, 100 ml or optionally, 4 pairs of gas wash bottles, 30 ml (21
42、).5.1.12 Pressure monitor (22).5.1.13 Temperature monitor (23).5.1.14 Test piece holder, constructed as a shelf with three rods made from stainless steel or another inert material (24).NOTE The test apparatus described in Figure 1 is based on a waterborne heating system. A test apparatus with an ele
43、ctrical heating system can be used optionally.5.2 Laboratory equipment5.2.1 Ventilated oven, as described in ISO 16979 for determination of moisture content (if requested).2 ISO 2015 All rights reservedBS EN ISO 12460-3:2015ISO 12460-3:2015(E)5.2.2 Spectrophotometer, with cells of 50 mm optical path
44、 length and capable of measuring absorbance at 412 mm.5.2.3 Water bath, capable of maintaining a temperature of (60 1) C.5.2.4 Water bath, capable of maintaining a temperature in the range of 20 C to 25 C.5.2.5 Six volumetric flasks, 100 ml (calibrated at 20 C).5.2.6 Four volumetric flasks, 250 ml o
45、r optionally, four volumetric flasks, 100 ml (calibrated at 20 C).5.2.7 two volumetric flasks, 1 000 ml (calibrated at 20 C).5.2.8 Volumetric pipettes (calibrated at 20 C), 1 ml, 2 ml, 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 50 ml, 100 ml.5.2.9 Six flasks, 50 ml (with stoppers).5.2.10 Microburette.5.2.11
46、Burette, 50 ml, graduated (calibrated at 20 C).5.2.12 Balance, capable of measuring to 0,00 1 g.6 Sampling and preparation of test pieces6.1 Preparation of test piecesThree test pieces, each with the dimensions of (400 1) mm (50 1) mm board thickness, shall be prepared for the determination of forma
47、ldehyde release giving a total emitting surface area of 0,04 m2.If the sample available does not allow the preparation of test pieces of the specified dimension, then the combined emitting surface area of the test pieces(s) should be as close as possible to 0,04 m2.For testing layer glued materials
48、(e.g. plywood, veneered particleboard), specimens shall be cut from the respective panel with the fibre direction of the faces perpendicular to the longitudinal axis of the specimen.Each test piece has to be hermetically wrapped immediately after cutting and stored at ambient temperature.Before test
49、ing, each test piece shall be stored hermetically wrapped at least one day at ambient temperature in order to improve the repeatability. For factory production control with hot test pieces, a valid correlation has to be established.For testing, the test pieces shall be edge sealed with temperature resistant (i.e. 60 C) self-adhesive aluminium tape or an alternative sealing method if equivalence has been demonstrated. The emitting (unsealed) surface area of the sealed test piece has to be measured and calculated in square
