DIN EN ISO 12460-5:2016-05

This standard specifies an extraction method known as the "perforator method". It is used for the determination of the formaldehyde content of unlaminated and uncoated wood-based panels. The perforator method is used for factory production control of the formaldehyde release of wood-based materials. The formaldehyde is extracted from test pieces by means of boiling toluene and then transferred into distilled or demineralized water. The formaldehyde content of this aqueous solution is determined photometrically by the acetylacetone method. The objective of the revision was to improve the detection limit and the reproducibility of the method with regard to boards with low formaldehyde content. Compared with DIN EN 120:1992-08, recommendation of cell length for low emitting samples were added, the relative humidity for conditioning climate is increased to (50 ± 5) %, the procedure and evaluation of third extraction were modified, the accuracy of weighing of test pieces enhanced and higher mass of the test pieces is added as an option for low emitting boards, the precision of blank test was improved, the fluorimetric determination of formaldehyde was added an option, the temperature of water bath is increased to 60 °C, modification factors for moisture content were included, the calibration curve is modified and a new Annex A for calibration and quality assurance was added. By applying a parallel enquiry at ISO and CEN according to the Vienna Agreement, the specifications of EN 120 and ISO 12460-5 are combined in prEN ISO 12460-5. The responsible committee is NA 042-02-15 AA "Holzwerkstoffe - Spiegelausschuss zu CEN/TC 112 und ISO/TC 89" ("Wood-based panels - Mirror Committee of CEN/TC 112 and ISO/TC 89").