UNE-EN ISO 12629:2023

This International Standard specifies the equipment and procedure for determining the water vapourtransmission properties in the steady state under specified test conditions for test specimens ofpreformed pipe insulation. It is applicable to thermal insulating products.It is intended to be used for homogeneous materials (see Note below) and for products which may haveintegral skins or adhered facings of some different material.NOTE A material is considered to be homogeneous in terms of mass distribution if its density is approximatelythe same throughout, i.e. if the measured density values are close to its mean density.The water vapour transmission rate and permeance values are specific to the test specimen (i.e. theproduct) thickness tested. For homogeneous products, the water vapour permeability is a property of thematerial.If the pipe insulation is cut from a flat product, then the water vapour transmission properties can beobtained from tests carried out on the flat product with similar properties in accordance with ISO 12572.