Rothoblaas - Tapes, Sealants and Membranes Page 248
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MONOLITHIC AND MICROPOROUS The family of synthetic breathable membranes and vapour control layers and barriers (that is, membranes made of materials deriving from polymers) offer different properties as a function of the production technologies and raw materials used in processing. MICROPOROUS MEMBRANES MONOLITHIC MEMBRANES Polymeric chain Polymer Micropores Water vapour molecule CHARACTERISTICS Water vapour molecule CHARACTERISTICS Thermal stability Thermal stability Durability and stability with ageing Durability and stability with ageing UV stability UV stability Chemical stability Chemical stability Low reaction to fire Low reaction to fire Breathability (water vapour) Breathability (water vapour) Watertightness Watertightness Airtightness Airtightness Resistance to heavy rain Resistance to heavy rain Mechanical resistance Mechanical resistance Slipping resistance Slipping resistance Resistance to pollutants Resistance to pollutants Membrane with functional microporous layer, obtained through mechanical processing during the production. Permeability to water vapour is entrusted to the capillary principle: the water molecule passes through the micropores in the functional film, enclosed in one or two protective layers. Rothoblaas offers:TRASPIR 110, TRASPIR 150, TRASPIR 200. Membranes with a homogeneous and continuous functional layer. The permeance of monolithic membranes is provided by the ability of the polymer of which they are composed to make a chemical interaction with water molecules. Some polymers, in fact, are able to activate a chemical interaction with water molecules and therefore to be crossed through, thus becoming breathable. Rothoblaas offers: TRASPIR EVO 160, TRASPIR EVO 220, TRASPIR EVO 300. Microscope image of a microporous membrane section. Upper part: microporous film. Lower part: support and protection fibre filaments. 248 | MONOLITHIC AND MICROPOROUS | MEMBRANES Microscope image of a monolithic membrane section. Upper part: monolithic film. Lower part: support and protection fibre filaments.
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