This European Standard specifies the equipment and procedures for determining the water vapour transmission rate, water vapour permeance and water vapour permeability of test specimens in the steady state under different sets of specified test conditions. It is applicable to thermal insulating products. It is intended to be used for homogeneous materials (see note 1) and for products which may contain integral skins or facings of different material(s). The water vapour transmission rate and permeance values are specific to the test specimen (i. e. the product) thickness tested. For homogenous products, the water vapour permeability is a property of the material.
Registration number (WIID)
35275
Scope
This European Standard specifies the equipment and procedures for determining the water vapour transmission rate, water vapour permeance and water vapour permeability of test specimens in the steady state under different sets of specified test conditions. It is applicable to thermal insulating products. It is intended to be used for homogeneous materials (see note 1) and for products which may contain integral skins or facings of different material(s). The water vapour transmission rate and permeance values are specific to the test specimen (i. e. the product) thickness tested. For homogenous products, the water vapour permeability is a property of the material.
