BS EN 717-1:2004 pdf free.Wood-based panels — Determination of formaldehyde release — Formaldehyde emission by the chamber method.
BS EN 717-1 This European Standard specifies a chamber method with three options of test chambers for the dete rmination of the formaldehyde emission from wood-based panels in terms of the steady-state concentration in a clmate chamber under defined conditions, which relate to typical conditions in real-life.This chamber method can also be applied to the estimation of for maldehyde concentrations under various conditions in practice, by the use of mathe-matical models.
This standard can also be used for the testing of formaldehyde emissions of products other than wood-basedpanels.
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 (ircluding any amendments) applies.
EN 326-1, Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test piecesand expression of test results.
For the purposes of this European Standard, the following terms and definitions apply.volume of the chamber total air volume of the unloaded chamber, including recirculating ventilation ducts, expressed in cubic metres(m)
Test pieces of known surface area, are placed in a chamber, in which the temperature, relative humidity, air velocity and exchange rate are controlled at defined values.Formal dehyde emitted from the test pieces mixes with theair in the chamber. The air in the chamber is sampled periodically.The formaldehyde concentration is determinedby drawing air from the chamber through gas washing bottles containing water, which absorbs the formaldehyde.The formaidehyde concentration in the water is determined.The concentration of formaldehyde in the chamber atmosphere is calculated from the concentration in the water in the gas washing bottles and the volume of the sarpled air. lt is expressed in miligrams per cubic metre (mg/m’). Sampling is periodically continued until the formadehyde concentration in the chamber has reached a steadystate.
NOTE The influences of temperature, relative humidity, loading factor and air exchange rate on the formaldehyde concetration in the chamber atmosphere can be described by formulas (e.g.Andersen formula). An interrelation between the structuof the test pieces, especially of their surfaces and the air velocity is also apparent but cannot be exactly described by a formula.BS EN 717-1 pdf download.