EN 717-1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.RãþDQMHHolzwerkstoffe - Bestimmung der Formaldehydabgabe - Teil 1: Formaldehydabgabe nach der Prüfkammer-MethodePanneaux a base de bois - Détermination du dégagement de formaldéhyde - Partie 1 : Emission de for-maldéhyde par la méthode a la chambreWood-based panels - Determination of formaldehyde release - Part 1: Formaldehyde emission by the chamber method79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 717-1:2004SIST EN 717-1:2005en01-januar-2005SIST EN 717-1:2005SLOVENSKI
STANDARDSIST ENV 717-1:20001DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 717-1October 2004ICS 79.060.01Supersedes ENV 717-1:1998
English versionWood-based panels - Determination of formaldehyde release -Part 1: Formaldehyde emission by the chamber methodPanneaux à base de bois - Détermination du dégagementde formaldéhyde - Partie 1 : Emission de for-maldéhydepar la méthode à la chambreHolzwerkstoffe - Bestimmung der Formaldehydabgabe -Teil 1: Formaldehydabgabe nach der Prüfkammer-MethodeThis European Standard was approved by CEN on 16 August 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 717-1:2004: ESIST EN 717-1:2005

Test chambers.17 Annex B (normative)
Determination of air exchange rate.24 Annex C (normative)
Determination of the steady-state emission value.26 Annex D (informative)
Analytical procedure for the fluorimetric determination of formaldehyde
content.29 Bibliography.31
results, it is recommended to participate in a round-robin test for calibration at least once a year. SIST EN 717-1:2005

panels. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 326-1, Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test pieces and expression of test results. 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 volume of the chamber total air volume of the unloaded chamber, including recirculating ventilation ducts, expressed in cubic metres (m3) 3.2 loading factor ratio of the total surface area of the test piece, excluding the area of the edges, to the volume of the chamber, ex-pressed in square metres per cubic metre (m2/m3) 3.3 air exchange rate quotient of air volume passing through the chamber per hour (m3/h) and the chamber volume (m3) 3.4 air velocity velocity of the air near the surface of test pieces in the chamber in metres per second (m/s) 3.5 steady-state state when the formaldehyde emission of the wood-based panels is quasi constant under the test conditions, this means that the formaldehyde concentration in the chamber remains constant NOTE In practice, a true steady-state is not achievable because formaldehyde is emitted irreversibly. This standard defines a steady-state condition for the purpose of the test (see Clause 10). SIST EN 717-1:2005

1 ppm (parts per million) = 1,24 mg/m3
1 mg/m³ = 0,81 ppm (parts per million) 4 Principle Test pieces of known surface area, are placed in a chamber, in which the temperature, relative humidity, air velo-city and exchange rate are controlled at defined values. Formaldehyde emitted from the test pieces mixes with the air in the chamber. The air in the chamber is sampled periodically. The formaldehyde concentration is determined by drawing air from the chamber through gas washing bottles containing water, which absorbs the formaldehyde. The formaldehyde concentration in the water is determined. The concentration of formaldehyde in the chamber at-mosphere is calculated from the concentration in the water in the gas washing bottles and the volume of the sam-pled air. It is expressed in milligrams per cubic metre (mg/m3). Sampling is periodically continued until the formal-dehyde concentration in the chamber has reached a steady-state. NOTE The influences of temperature, relative humidity, loading factor and air exchange rate on the formaldehyde concen-tration in the chamber atmosphere can be described by formulas (e.g. Andersen formula). An interrelation between the structure of the test pieces, especially of their surfaces and the air velocity is also apparent but cannot be exactly described by a formula. 5 Reagents 5.1 General Reagents and water of recognised analytical purity shall be used for the analysis. 5.2 Acetylacetone solution 4 ml acetylacetone are added to a 1 000 ml volumetric flask and made up to the mark with water. 5.3 Ammonium acetate solution 200 g ammonium acetate are dissolved in water in a 1 000 ml volumetric flask and made up to the mark. NOTE Commercially prepared solutions may be used. 5.4 Formaldehyde standard solution Standard iodine solution c(l2) = 0,05 mol/l Standard sodium thiosulphate solution c(Na2S2O3) = 0,1 mol/l Standard sodium hydroxide solution c(NaOH) = 1 mol/l Standard sulphuric acid solution c(H2SO4) = 1 mol/l SIST EN 717-1:2005

The positions of the measuring points depend upon the volume of chamber and the type of air flow. Air velocity shall be measured at a minimum of 4 positions in large chambers (≥ 12 m3) and at a minimum of 2 positions in small chambers (1 m³ or 0,225 m³). 8.2.6 Performance of the chamber The performance of the test chamber can be tested by a procedure described by [7]. 8.3 Chamber preparation Set the chamber to the conditions given in 8.1. The determination (see 8.6) of the formaldehyde concentration in the empty chamber (“background-level”) shall be carried out not less than 1 h after establishing the test conditions according to 8.1. SIST EN 717-1:2005

8.4.2 Large chambers (see A.1) Edge sealing shall not be done for the 1 m × 2 m test pieces tested in large chambers (≥ 12 m3). The perimeter, i. e the length of open (unsealed) edges U for 1 m × 2 m pieces is 6 m and the surface area A is 4 m2. Thus the ratio of U/A is 1,5 m/m2. 8.4.3 Small chambers (see A.2 and A.3) In order to obtain the same ratio of U/A = 1,5 m/m2 for smaller test pieces in small chambers, partial edge sealing is necessary. This sealing should be done using self-adhesive aluminium tape. NOTE The length of edges to be sealed is given in A.2.3 for 1 m3 chambers and in A.3.3 for 0,225 m3 chambers. 8.5 Loading and starting procedure Place the test pieces in the test chamber. They shall be vertical and approximately in the centre of the chamber, with their surfaces parallel to the direction of the air flow, and separated by not less than 200 mm (see Figures A.1 to A.5 and A.7). The first air sampling shall be made not less than 3 h after loading the chamber and starting the test procedure. 8.6 Air sampling and analysis Add at least 25 ml of water to each of the two gas washing bottles and connect them to the apparatus (see 6.2 and Figure 1). Sample the air from the chamber periodically by passing a minimum of 120 l, at a rate of approximately 2 l/min, through the gas washing bottles. Pipette 10 ml of each of the absorption solutions into a 50 ml flask and add 10 ml acetylacetone solution (see 5.2) and 10 ml of ammonium acetate solution (see 5.3). Stopper the flasks and determine the formaldehyde content of the solutions according to Clause 9. NOTE The volume of air to be sampled depends on its formaldehyde concentration. With photometric determination the procedure described above is suitable for concentrations higher than 0,005 mg/m3. For determination of lower concentrations, the volume of the sampled air should be increased and/or the volume of the air sample solution reduced. The sensitivity of the analysis can also be increased by using a fluorimetric determination of the reaction product (diacetyldihydrolutidine) instead of a photometric determination.
...