Сидоров С. С.  (15 ноября 2011 г.)  /   all FAQ

TEHFOM is vapor permeable. What is the water vapor permeability? Is this an advantage or a disadvantage?

The vapor permeability is a material's ability to skip or to delay the steam as a result of the difference of vapor partial pressure of water vapor on both sides of the material layer at equal atmospheric pressure, characterized by the coefficient of water vapor permeability or resistance to permeability when exposed to water vapor. As a rule, materials with good water vapor permeability are referred to as "breathing." What does this mean? The fact that the material is able to pass through itself both air and steam. In the case of TEHFOM, this is due to the finely porous structure of the material. Good vapor permeability is more a material advantage rather than the lack of it. Let's see why. Steam, as a result of human activity (his breathing, cooking, water treatment, etc.), unless there is no effective ventilation system, creates a high humidity in the house that can be seen visually in the form of condensate, for example, on iron pipes with cold water. Excessive moisture, in its turn, is fraught with various troubles in the home, from the fungus on the walls and the ceiling to the allergic reaction until the asthma. If the walls of the house have a high water vapor permeability, the indoor climate improves, the levels of moisture decline, the likelihood of fungus or mold minimizes, it is easier to breathe.