prEN 717-2 rev

SLOVENSKI STANDARD
01-januar-2012
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Wood-based panels - Determination of formaldehyde release - Part 2: Gas analysis
method
Holzwerkstoffe - Bestimmung der Formaldehydabgabe - Teil 2: Formaldehydabgabe
nach der Gasanalyse-Methode
Panneaux à base de bois - Détermination du dégagement de formaldéhyde - Partie 2:
Méthode d'analyse de gaz
Ta slovenski standard je istoveten z: prEN 717-2 rev
ICS:
79.060.01 /HVQHSORãþHQDVSORãQR Wood-based panels in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2011
ICS 79.060.01 Will supersede EN 717-2:1994
English Version
Wood-based panels - Determination of formaldehyde release -
Part 2: Gas analysis method
Panneaux à base de bois - Détermination du dégagement Holzwerkstoffe - Bestimmung der Formaldehydabgabe -
de formaldéhyde - Partie 2: Méthode d'analyse de gaz Teil 2: Formaldehydabgabe nach der Gasanalyse-Methode
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 112.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 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, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 717-2 rev:2011: E
worldwide for CEN national Members.

prEN 717-2:2011 (E)
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Principle .4
4 Reagents .4
4.1 General .4
4.2 Acetylacetone solution .4
4.3 Ammonium acetate solution .5
4.4 Formaldehyde solution .5
4.5 Standard iodine solution .5
4.6 Standard sodium thiosulphate solution .5
4.7 Standard sodium hydroxide solution .5
4.8 Standard sulphuric acid solution .5
4.9 Starch solution .5
5 Apparatus .5
5.1 The test apparatus (see Figure 1) comprises the following main components: .5
5.2 Laboratory equipment .6
6 Sampling and preparation of test pieces .6
6.1 Preparation of test pieces .6
6.2 Selection of test pieces for factory production control .6
6.3 Selection of test pieces for other purposes (not covered by 6.2 and 6.4) .7
6.4 Selection of test pieces in case of dispute .7
7 Procedure .7
7.1 Number of determinations .7
7.2 Determination of formaldehyde release .7
7.3 Determination of formaldehyde content of the aqueous solutions .8
7.3.1 General .8
7.3.2 Principle .8
7.3.3 Analytical Procedure .8
7.3.4 Calibration curve.9
8 Expression of results . 10
8.1 Gas analysis value . 10
8.2 Calculation of results . 10
8.2.1 Calculation of results of test pieces . 10
8.2.2 Calculation of emission report value . 11
9 Test report . 11
Bibliography . 14

prEN 717-2:2011 (E)
Foreword
This document (prEN 717-2:2011) has been prepared by Technical Committee CEN/TC 112 “Wood-based
panels”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 717-2:1994.
The objective of the revision was to improve the detection limit and the reproducibility of the
method with regard to low boards with low formaldehyde content.
Compared to EN 717-2:1994 the following modifications have been made:
a) in 6.1 preparation of test pieces described more in detail;
b) in 6.2 provision of maximum time 72 h after sampling for formaldehyde determination added;
c) in 6.4 conditioning for sampling and testing in case of dispute added;
d) in 7.1 and 8.2.2 procedure and evaluation of third determination modified;
e) provisions for determination of moisture content deleted;
f) in 7.2 use of smaller gas wash bottles and volumetric flasks to improve the sensitivity included as an
option;
g) in 7.3.3 higher amounts of aqueous solution to improve the sensitivity included as an option;
h) in 7.3.3 temperature of water bath increased to 60 °C and cooling procedure modified;
i) in 7.3.4.1 minimum interval of check of the calibration curve extended to once a month;
j) in clause 9 age and treatment of the sample included in the test report;
k) in Figure 2 calibration curve modified;

prEN 717-2:2011 (E)
1 Scope
This European Standard specifies a procedure for determination of accelerated formaldehyde release from
wood-based panels using the gas analysis method. The procedure is also suitable for the testing of other
materials (e.g. edge bands, floor coverings, foams, foils, laminated wood products).
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 322, Wood-based panels — Determination of moisture content
EN 326-1, Wood-based panels — Sampling and cutting of test pieces.
3 Principle
A 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 through gas wash bottles,
containing water, which absorbs the released formaldehyde. At the end of the test, the formaldehyde
concentration is determined photometrically. The formaldehyde release is calculated from this concentration,
the sampling time and the exposed area of the test pieces and is expressed in milligrams per square meter
and hour (mg/m h).
4 Reagents
4.1 General
Reagents of recognized analytical purity and distilled or demineralised water (referred throughout the following
text as distilled water) shall be used for the analysis.
4.2 Acetylacetone solution
4 ml acetylacetone are added to a 1 000 ml volumetric flask and made up to the mark with distilled water.
prEN 717-2:2011 (E)
4.3 Ammonium acetate solution
200 g ammonium acetate are dissolved with distilled water in a 1 000 ml volumetric flask and made up to the
mark.
NOTE Optionally, a premixed reagent of acetylacetone and ammonium acetate as described in ISO 12460-4:2008,
4.1 may be used.
4.4 Formaldehyde solution
Commercially available formaldehyde solution (concentration typically between 35 % to 40 %)
4.5 Standard iodine solution
c(l ) = 0,05 mol/l
4.6 Standard sodium thiosulphate solution
c(Na S O ) = 0,1 mol/l
2 2 3
4.7 Standard sodium hydroxide solution
c(NaOH) = 1 mol/l
4.8 Standard sulphuric acid solution
c(H SO ) = 1 mol/l
2 4
4.9 Starch solution
1 % by mass
5 Apparatus
5.1 The test apparatus (see Figure 1) comprises the following main components:
5.1.1 Air filter (1).
5.1.2 Wash bottle, 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 volume 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).
prEN 717-2:2011 (E)
5.1.11 4 pairs of gas wash bottles, 100 ml or optionally 4 pairs of gas wash bottles, 30 ml (21).
5.1.12 Pressure monitor (22).
5.1.13 Temperature monitor (23).
NOTE The test apparatus described in Figure 1 is based on a waterborne heating system. A test apparatus with an
electrical heating system can be used optionally.
5.2 Laboratory equipment
5.2.1 Ventilated oven, as described in EN 322.
5.2.2 Spectrophotometer with cells of 50 mm optical path 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 6 volumetric flasks, 100 ml (calibrated at 20 °C).
5.2.6 4 volumetric flasks, 250 ml, or optionally 4 volumetric flasks, 100 ml (calibrated at 20 °C).
5.2.7 2 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 6 flasks, 50 ml, (with stoppers).
5.2.10 Microburette.
5.2.11 Burette, 50 ml, graduated (calibrated at 20 °C).
5.2.12 Balance, capable of measuring to 0,001 g.
6 Sampling and preparation of test pieces
6.1 Preparation of test pieces
Three test pieces, each with the dimensions of (400 ± 1) mm × (50 ± 1) mm x board thickness shall be
prepared for the determination of formal
...