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Ultrason - The Material of Choice for Membranes (Filtration)

 

Ultrason® provides excellent product performance due to its outstanding qualities

 

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    Outstanding mechanical properties between -50°C and 220°C (it outperforms most other commercially available thermoplastics between 150°C and 220°C)
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    High dimensional stability with:
    • a low co-efficient of thermal expansion (CTE)
    • no warpage, owing to the absence of crystallization
    • low creep, even at high temperatures
  •  
    Excellent long-term heat aging properties (RTI, UL 746B at 155°C and 180°C, PSU and PESU respectively)
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    Short-term temperature resistance up to 180° and 220°C respectively
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    Excellent chemical resistance (e.g. to water, acids, bases, fuel, oil, grease, fluorine, NaOCl solution, even at high temperatures)
  •  
    Can be used over a wide pH range (0-13) (PESU is superior to PSU in terms of temperature resistance and extreme pH values)
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    Repeated sterilization possible with superheated steam at 121°C or 134°C, (ethylene oxide, radiation)
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    Transparent (if compact) with low tendency to pick up color from food ingredients
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    Complies with FDA and European standards for food contact (repeated use)
  •  
    Good pore size control
  •  
    Soluble in solvents commonly used for membrane production

 

Enhanced Features

 

Whereas Ultrason® E (PESU) is characterized by an inherently low quantity of oligomers, polysulfone (PSU) tends to contain somewhat higher concentrations of these (mainly cyclic) components. Especially the cyclic dimer due to its tendency to form crystals in the spinning solution causes problems in the membrane spinning process.

 

Ultrason® S products 3010, 6010 are optimized in this respect and have a low cyclic oligomer content, as a result of which they improve the following:

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    The spinning or casting solution stability (reduced maintenance costs of the spinning facility)
  •  
    The stability of the membrane production process
  •  
    The defect rate on the membrane surface

 

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