Dow Filmtec RO membrane

Reverse osmosis membrane of Dow Chemical, USA

Membranes under the tradename FILMTEC ™ produced US FilmTec Corporation, subsidiary of The Dow Chemical Company ("Dow"). These elements are designed to reverse osmosis systems; separation process uses pressurized fluid, wherein the clean water passes through the membrane, leaving the dissolved salts and other contaminants from the outside of the membrane film.

   FILMTEC membranes consist of one or more membrane envelopes of thin helically wound on a hollow shaft with perforations. A film of each membrane envelope consists of three layers: ultrathin polyamide barrier layer (about 0.2 mm), a substrate layer of polyester and polysulfone. The thickness of the entire film is about 160 microns (for comparison, a standard A4 sheet of paper has a thickness of about 100 microns.) The barrier layer of polyamide allows water molecules easily penetrate the envelope, at the same time not passing impurities and solutes. Polysulfone and polyester layers provide structural support to the barrier layer. The technical name for this type of membranes - thin-film composite (THIN-FILM COMPOSITE) or TFC. Envelopes membrane (one or several) are wound on a hollow plastic tube into a spiral through a special layer mesh - spacer. This coil of a tube in the center is called the membrane element, the performance called SPIRAL WOUND.

The system of reverse osmosis membrane elements are placed in a cylindrical container that can withstand the required pressure.

  The membrane FILMTEC elements used in reverse osmosis systems for water treatment in hospitals, research laboratories, car wash, restaurants, factories for the production and bottling of water and drink vending machines water, catering, residential houses and apartments, various industries, municipal facilities water treatment and other industries and facilities that require water with low salinity. Membrane FILMTEC elements are also used in household reverse osmosis filter.

  Domestic Standard segment of the membrane used in 1812 (1.8 inch diameter, 12-inch length of the rod).

  The barrier layer of polyamide membrane elements destroyed by chlorine, therefore, a prerequisite for operation of FILMTEC ™ membrane is the presence of dechlorinated filters before the water in the reverse osmosis membrane.

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