ISO 12460-3:2008
(Main)Wood-based panels — Determination of formaldehyde release — Part 3: Gas analysis method
Wood-based panels — Determination of formaldehyde release — Part 3: Gas analysis method
ISO 12460-3:2008 specifies a procedure for determination of accelerated formaldehyde release from wood-based panels using the gas analysis method.
Panneaux à base de bois — Détermination du dégagement de formaldéhyde — Partie 3: Méthode d'analyse des gaz
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12460-3
First edition
2008-04-15
Wood-based panels — Determination of
formaldehyde release —
Part 3:
Gas analysis method
Panneaux à base de bois — Détermination du dégagement de
formaldéhyde —
Partie 3: Méthode d'analyse des gaz
Reference number
ISO 12460-3:2008(E)
©
ISO 2008
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ISO 12460-3:2008(E)
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ISO 12460-3:2008(E)
Foreword
ISO (the International 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
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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
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ISO 12460-3 was prepared by Technical Committee ISO/TC 89, Wood-based panels.
ISO 12460 consists of the following parts, under the general title Wood-based panels — Determination of
formaldehyde release:
⎯ Part 1: Formaldehyde emission by the 1-cubic-metre chamber method
⎯ Part 2: Small-scale chamber method
⎯ Part 3: Gas analysis method
⎯ Part 4: Desiccator method
The extraction (or perforation) method will form the subject of a future Part 5.
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ISO 12460-3:2008(E)
Introduction
ISO 12460-1 specifies the 1-cubic-metre chamber reference method for the determination of formaldehyde
release. Derived test methods specified in ISO 12460-2, ISO 12460-3 and ISO 12460-4 are intended for
factory production control.
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INTERNATIONAL STANDARD ISO 12460-3:2008(E)
Wood-based panels — Determination of formaldehyde
release —
Part 3:
Gas analysis method
1 Scope
This part of ISO 12460 specifies a procedure for determination of accelerated formaldehyde release from
wood-based panels using the gas analysis method.
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.
ISO 16979, Wood-based panels — Determination of moisture content
ISO 16999, 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, air flow
and pressure are controlled to defined values. Formaldehyde released from the test piece 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 piece, and is expressed in milligrams per square meter hour.
4 Reagents
Use only reagents of recognized analytical grade, unless otherwise specified, and distilled or demineralized
water or water of equivalent purity.
4.1 Acetylacetone solution.
Add 4 ml acetylacetone (pentane-2,4-dione, C H O ) to a 1 000 ml volumetric flask (5.2.6) and make up to
5 8 2
the mark with water.
4.2 Ammonium acetate solution.
Dissolve 200 g ammonium acetate (C H O NH ) in water in a 1 000 ml volumetric flask (5.2.6) and make up
2 3 2 4
to the mark with water.
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ISO 12460-3:2008(E)
Commercially prepared solutions may be used, provided they can be shown to give results equivalent to those
obtained with solutions prepared in the laboratory.
4.3 Iodine standard solution, c(l ) = 0,05 mol/l.
2
Standardize the solution before use.
4.4 Sodium thiosulfate standard solution, c(Na S O ) = 0,1 mol/l.
2 2 3
Standardize the solution before use.
4.5 Sodium hydroxide standard solution, c(NaOH) = 1 mol/l.
Standardize the solution before use.
4.6 Sulfuric acid standard solution, c(H SO ) = 1 mol/l.
2 4
Standardize the solution before use.
4.7 Starch solution, 1 % mass fraction.
5 Apparatus
5.1 Test apparatus
The set-up (see Figure 1) comprises the following main components.
5.1.1 Air filter.
5.1.2 Wash bottle, of capacity 500 ml, containing about 400 ml distilled water.
5.1.3 Desiccator, of capacity 500 ml, containing silica gel.
5.1.4 Air pump.
5.1.5 Needle valve.
5.1.6 Air flow meter.
5.1.7 Test chamber, of diameter 90 mm to 100 mm and of such a length as to give an internal volume of
(4 000 ± 200) ml, with double casing of stainless steel, glass or other suitable inert material.
5.1.8 Air-heating equipment, e.g. copper coil inside double casing.
5.1.9 Thermostat.
5.1.10 Magnetic valves.
5.1.11 Wash bottles, each of capacity 100 ml, four pairs.
5.1.12 Pressure gauge.
5.1.13 Thermometer.
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ISO 12460-3:2008(E)
Key
1 air filter 7 test chamber 13 test air outlet 19 magnetic purging valve
2 wash bottle 8 air-heating coil 14 heating medium inlet 20 connection tube
3 desiccator 9 thermostat 15 insulation 21 wash bottles (pair)
4 air pump 10 magnetic valves 16 test chamber door 22 pressure gauge
5 needle valve 11 test chamber air inlet 17 double casing 23 thermometer
6 air flow meter 12 heating medium outlet 18 heating coil air inlet
Figure 1 — Gas analysis test apparatus
5.2 Laboratory equipment
Usual laboratory equipment and in particular the following.
5.2.1 Ventilated oven, as specified in ISO 16979.
5.2.2 Spectrophotometer, with cells of optical pathlength 50 mm, capable of measuring absorbance at
412 nm.
5.2.3 Water bath, capable of maintaining a temperature of (60 ± 1) °C.
5.2.4 Volumetric flasks, six, each of capacity 100 ml.
5.2.5 Volumetric flasks, four, each of capacity 250 ml.
5.2.6 Volumetric flasks, two, each of capacity 1 000 ml.
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ISO 12460-3:2008(E)
5.2.7 Wash bottles, eight, each of capacity 100 ml.
5.2.8 Bulb pipettes, of capacities 5 ml, 10 ml, 15 ml, 20 ml, 25 ml, 50 ml, and 100 ml.
5.2.9 Flasks with stoppers, six, each of capacity 50 ml.
5.2.10 Microburette.
5.2.11 Burette, of capacity 50 ml.
5.2.12 Balance, capable of measuring to 0,001 g.
6 Test pieces
6.1 Selection of test pieces for production control
Sampling and cutting of the test pieces shall be in accordance with ISO 16999.
All test pieces have to be placed in a hermetically sealed container immediately after cutting and stored at
room temperature.
Test pieces are taken uniformly distributed over the width of the (cooled) board, but excluding a 500 mm wide
strip at each end of the board.
6.1.1 For the determination of formaldehyde release, three test pieces of dimensions 400 mm × 50 mm × d,
where d is the board thickness.
6.1.2 For the determination of moisture content, five or six test pieces of dimensions 25 mm × 25 mm × d.
6.2 Selection of test pieces for other purposes
The procedure of taking test pieces (e.g. from boards already inst
...
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