DIN EN ISO 15234-2011 Paints and varnishes - Testing of formaldehyde-emitting coatings and melamine foams - Determination of the steady-state concentration of formaldehyde in a sma.pdf

1、February 2011 Translation by DIN-Sprachendienst.English price group 11No 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).I

2、CS 87.040!$my,“1748609www.din.deDDIN EN ISO 15234Paints and varnishes Testing of formaldehyde-emitting coatings and melamine foams Determination of the steady-state concentration of formaldehyde in asmall test chamber (ISO 15234:1999)English translation of DIN EN ISO 15234:2011-02Beschichtungsstoffe

3、 Prfung von Formaldehyd emittierenden Beschichtungen und Melaminschaumstoffen Bestimmung der Ausgleichskonzentration an Formaldehyd in einem kleinen Prfraum(ISO 15234:1999)Englische bersetzung von DIN EN ISO 15234:2011-02Peintures et vernis Essais des revtements et mousses mlamines qui mettent du fo

4、rmaldhyde Dtermination de la concentration lquilibre du formaldhyde dans une petite chambredessai (ISO 15234:1999)Traduction anglaise de DIN EN ISO 15234:2011-02SupersedesDIN 55666:1995-04www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authorita

5、tive.1703.11 DIN EN ISO 15234:2011-02 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes”, Subcommittee SC 10 “Test methods for binders for paints and varnishes” (Secretariat: DIN, Germany) in collaboratio

6、n with Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und The DIN Standards corresponding to the International Standards referred to in this document are as follows

7、: ISO 3270 DIN EN 23270 ISO 3696 DIN ISO 3696 Amendments This standard differs from DIN 55666:1995-04 as follows: a) the status of the standard has been changed to that of a European Standard; b) textiles have been deleted from the scope; c) the standard has been editorially revised. Previous editio

8、ns DIN 55666: 1995-04 National Annex NA (informative) Bibliography DIN EN 23270, Paints, varnishes and their raw materials Temperatures and humidities for conditioning and testing DIN ISO 3696, Water for analytical laboratory use Specification and test methods Beschichtungen (Coatings and Coating Ma

9、terials Standards Committee), Working Committee NA 002-00-07 AA Allgemeine Prfverfahren fr Beschichtungsstoffe und Beschichtungen. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15234 November 2010 ICS 87.040 English Version Paints and varnishes - Testing of formaldehyde-emitting coatings

10、and melamine foams - Determination of the steady-state concentration of formaldehyde in a small test chamber (ISO 15234:1999) Peintures et vernis - Essais des revtements et mousses mlamines qui mettent du formaldhyde - Dtermination de la concentration lquilibre du formaldhyde dans une petite chambre

11、 dessai (ISO 15234:1999) Beschichtungsstoffe - Prfung von Formaldehyd emittierenden Beschichtungen und Melaminschaumstoffen - Bestimmung der Ausgleichskonzentration an Formaldehyd in einem kleinen Prfraum (ISO 15234:1999)This European Standard was approved by CEN on 16 October 2010. CEN members are

12、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 on application to th

13、e 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-CENELEC Management Cent

14、re 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw

15、ay, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form

16、and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 15234:2010: EContents DIN EN ISO 15234:2011-02 EN ISO 15234:2010 (E) 2 Page Foreword3 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Principle6 5 Choice of method for determination of formaldehyde.6 6 Apparatus .6 7

17、Reagents.8 8 Preparation of specimens.8 9 Procedure .9 10 Expression of results 10 11 Precision.11 12 Test report 11 Annex A (normative) Preparation of specimens from paints, varnishes and similar coating materials .12 Annex B (normative) Preparation of specimens from melamine foams .13 Annex C (inf

18、ormative) Explanatory notes.14 Foreword The text of ISO 15234:1999 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 15234:2010 by Technical Committee CEN/TC 139 “Paints and varnishe

19、s” 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 May 2011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is

20、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/CENELEC Internal Regulations, the national standards organizations of the foll

21、owing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slov

22、akia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 15234:1999 has been approved by CEN as a EN ISO 15234:2010 without any modification. DIN EN ISO 15234:2011-02 EN ISO 15234:2010 (E) 3 1 ScopeThis International Standard specifies a test method for d

23、etermining the equilibrium concentration of formaldehydefrom formaldehyde-emitting coatings and melamine foams in a small test chamber.It describes the determination of the equilibrium concentration of formaldehyde that is established in air at 23 C and50 % relative humidity. The test closely simula

24、tes practical conditions and can be performed on a laboratory scale.Good correlation is obtained with values obtained on samples of the same material in a 40 m3test chamber. Themethod, which is simple to perform, is therefore suitable for the preliminary determination of limits that have to beadhere

25、d to.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subject torevision, and parties to agreements based on th

26、is International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.ISO 3270:1984, Paints and varnishes and their raw materials Temperatures a

27、nd humidities for conditioning andtesting.ISO 3696:1987, Water for analytical laboratory use Specification and test method.3 DefinitionsFor the purposes of this International Standard, the following definitions apply.3.1equilibrium concentrationceqlthe concentration of formaldehyde in the air in the

28、 test chamber that is reached when several successive values ofthe concentration determined at one-hour intervals differ by less than 0,02 mg/m3DIN EN ISO 15234:2011-02 EN ISO 15234:2010 (E) 4 3.2air-replacement ratenthe number of air changes per hour in the test chamber, given byn=VtVtwhereVtis the

29、 volume, in cubic metres, of air passed through the test chamber during the test;t is the duration, in hours, of the test;V is the volume, in cubic metres, of the test chamber3.3relative specimen areaathe area of formaldehyde-emitting surface per unit volume of the test chamber, given, in square met

30、res per cubicmetre (i.e. m1), bya=AVwhereA is the area of the specimen, in square metres (see annexes A and B);V is the volume, in cubic metres, of the test chamber3.4steady-state ration/athe ratio of the air-replacement rate n to the relative specimen area a, given, in metres per hour, byn/a =VtAtw

31、hereVtis the volume, in cubic metres, of air passed through the test chamber during the test;t is the duration, in hours, of the test;A is the area, in square metres, of the specimen3.5formaldehyde concentrationcthe concentration, in milligrams per cubic metre, of formaldehyde at a given steady-stat

32、e ratio n/a over the periodof time concerned, given byc=mVtwherem is the mass, in milligrams, of formaldehyde;Vtis the volume, in cubic metres, of air passed through the test chamber during the testNOTE The value determined for c can be converted into ppm by dividing by the density of formaldehyde,

33、i.e. by 1,22 g/l ata temperature of 23 C and an atmospheric pressure of 101,3 kPa.DIN EN ISO 15234:2011-02 EN ISO 15234:2010 (E) 5 4 PrincipleTest specimens are conditioned at (23 1) C and (50 3) % relative humidity and exposed under specifiedconditions in a small test chamber (desiccator).The desic

34、cator is set up in an air-conditioned room so that air from the room can be passed first through thedesiccator and then into a water trap where formaldehyde (HCHO) is absorbed. The water in the water trap ischanged at regular intervals, and the formaldehyde concentration c is determined photometrica

35、lly by theacetylacetone method or another suitable method. The test is continued until the value measured for c no longerchanges (see 3.1). The equilibrium concentration ceqlin the air in the test chamber is then considered to beattained.5 Choice of method for determination of formaldehydeThe acetyl

36、acetone method has been chosen as the preferred method. Other methods of determination, e.g. afluorimetric method, may be used instead of the photometric method with acetylacetone, provided they can beshown to give equivalent results. (See also annex C, clause C.7.)6 ApparatusOrdinary laboratory app

37、aratus and glassware, together with the following:6.1 Air-conditioned room or similar facility, maintained at a temperature of (23 1) C and a relative humidity of(50 3) %.6.2 Apparatus (see figure 1) consisting of two gas-metering pumps, rate of pumping at least 100 l/h, pressure head dependent on p

38、ressure requirements, bubble counter;1 000 ml bottle with modified wash-bottle insert; test chamber, volume 20 l, such as a desiccator, with lid containing a wire cage for the specimens; hygrometer; two 30 ml wash-bottles with Muenke fitting, or other suitable absorption vessels; 500 ml wash-bottle

39、filled with silica gel to act as a drying tower; flowmeter, measuring range 0 l/h to 100 l/h; with fine-control valve; integrating flowmeter, operating range 1 l/h to 220 l/h.DIN EN ISO 15234:2011-02 EN ISO 15234:2010 (E) 6 Key1 Gas-metering pumps2 Bottle containing saturated calcium nitrate solutio

40、n to bring the air to (50 2) % relative humidity3 Vent tube with bubble counter4 Test chamber5 Specimens6 Hygrometer7 Wash-bottles/absorption vessels8 Wash-bottle containing silica gel (drying tower)9 Valve10 Flowmeter11 Integrating flowmeterFigure 1 Apparatus (schematic diagram)If necessary, two bo

41、ttles (2) may be connected in tandem. In this case, however, only the second bottle shall be fitted with avent tube (3).Checks shall be made to ensure that there are no leaks in the apparatus during the test.Connecting tubing shall be as short as possible.6.3 Spectrophotometer or filter photometer w

42、ith a 412 nm filter.6.4 50 mm spectrophotometer cell.6.5 100 ml, 500 ml and 1 000 ml volumetric flasks.6.6 10 ml microburette.6.7 1 ml volumetric pipette.6.8 Water bath, capable of being maintained at (60 2) C.6.9 Analytical balance, capable of weighing to an accuracy of 0,1 mg.DIN EN ISO 15234:2011

43、-02 EN ISO 15234:2010 (E) 7 7 ReagentsDuring the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity asdefined in ISO 3696.7.1 Colour-developer solution.Weigh 75,0 g of ammonium acetate into a 500 ml volumetric flask and dissolve in water. Add 1,5 ml

44、of concentratedacetic acid (96 % minimum) and 1,0 ml of acetylacetone. Make up to the mark with water and mix well.The solution is not stable. It may not be kept for more than 14 days at room temperature (temperature no higherthan 28 C).7.2 Formaldehyde, standard stock solution containing about 1 g/

45、l of formaldehyde.Weigh about 3 g of 30 % formaldehyde solution into a 100 ml beaker and dilute with water. Transfer the dilutedsolution into a 1 000 ml volumetric flask, make up to the mark with water and mix well.Determine the formaldehyde content of this solution as follows:To 20 ml of the formal

46、dehyde stock solution add 25 ml of iodine solution c(I2) = 0,05 mol/l, corresponding to12,69 g/l of I2 and 10 ml of sodium hydroxide solution c(NaOH) = 1 mol/l, corresponding to 40,00 g/l of NaOH.After five minutes, add 11 ml of hydrochloric acid c(HCl) = 1 mol/l, corresponding to 36,46 g/l of HCl a

47、nd a fewdrops of starch solution (1 % soluble, Zulkovsky). Titrate the excess iodine solution with sodium thiosulfate solutionc(Na2S2O3) = 0,1 mol/l, corresponding to 15,81 g/l of Na2S2O3.Calculate the formaldehyde content using the following equation:wV(CH O)0,001 5 (25 ) 1 000202=wherew(CH2O) is t

48、he formaldehyde content, in grams per litre, of the standard stock solution;V is the volume, in millilitres, of sodium thiosulfate solution used.7.3 Standard formaldehyde solution (8 mg/l formaldehyde).Run from the microburette (6.6) a volume of standard stock solution (7.2) containing 8 mg of forma

49、ldehyde into a1 000 ml volumetric flask, make up to the mark with water and mix well.1 ml of this standard solution contains 8 g of formaldehyde.7.4 Saturated calcium nitrate solution, prepared by dissolving calcium nitrate tetrahydrate, Ca(NO3)2 4H2O,(reagent grade) in water.8 Preparation of specimensThe required area A of the specimens can be calculated from the air-replacement rate n and the volume V of thetest chamber. For instance, if the number of air changes per ho