Ultrafiltration film is a film filtering between micro- filtering and nanometer-filter, which is applied to separation concentration and purification of substance. Its token is that withhold amount of molecule while it is used. It is mainly used to separate macromolecule, colloid and micro molecule substance such as mote solvent in liquor, which make macromolecule, colloid and mote etc withhold on the film surface cycle to flow to form concentration liquid and reach the aim of separation, concentration and purification of substance. The field applied of ultrafiltration film is food, drink, biology and medicine, industry of the chemicals and treatment and reclaim to used of waste water.
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