BS EN 17333-2:2020 pdf free.Characterisation of one component foam,Expansion characteristics.
BS EN 17333-2 This document specifies test methods for the evaluation of the expansion properties for moisture curing，self-curing activatable or water drying foams dispensed from single pressurized foam containers.This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.The following test methods are described:Method 1 – Dimensional stability: This test method describes how to determine the dimensional stability (shrinkage or expansion) of cured foam under typical and extreme conditions.一Method 2 – Curing pressure: This method describes how to determine the generation of pressure during the curing process of an OCF.Method 3 – Post expansion: This method describes how to measure the expansion of a dispensed froth during the curing phase.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 312, Particleboards – Specifications EN 923, Adhesives – Terms and definitions EN 15006, Metal aerosol containers – Aluminium containers . Dimensions of the 25,4 mm aperture EN 14847, Aerosol containers – Tinplate containers – Dimensions of the 25,4 mm aperture.The foam is dispensed in the gap between two particle boards. When foam is fully cured, the dimensional stability of the foam is determined by measurement of the distance between the panels over several days and weeks. NOTE  Typically 0CFs tend to shrink within the first few days after curing due to gas release from the closed cells. The vanishing propellant leaves an under-pressure in the cells resulting in a shrinking of cell size, therefore the whole foam shrinks. This effect is usually compensated over several days by the slower permeation of air. Shrinking foam can affect the sealing of joints by separation from the surfaces or deformation of the joints. The degree of shrinkage depends not only on the OCF formulation, but also on the environmental conditions e.g. humidity and/or temperature.BS EN 17333-2 pdf downlaod.