SPI Silver Membrane Filters

Physical Properties/Retention and flow rates

Physical Properties

Coefficient of thermal expansion: 18.8 x 10-6 per °C.
Resistivity: 1.59 µohm-cm at 20° C (68° F)
Specific Heat: 0.558 calories/gram at 20° C (68° F)
Thickness: approximately 50 µm


Retention and Flow Rates



Pore             Typical Flow           Rates      Typical       Operating
Size(a)            Water(b)               Air(c)      Bubble      Temperature(e)
                                                    Point(d)          
   µm              mL/min/cm2          L/min/cm2     psi          ° C /° F
---------       ----------------    -------------   ----         ---------
 
   5.0               870                 5.2          2            427/800
   3.0               690                 2.9          3            427/800
   1.2               460                 2.0          5            204/400
   0.8               340                 1.4          7            204/400
   0.45               40                 0.67         9            204/400
   0.2                17                 0.35        13            204/400



(a)  Absolute retention; measured by bubble point pressure.
(b)  Water flow rates are initial flow rates in mL/min/cm2 using prefiltered
     water at 10 psi differential pressure.
(c)  Air flow rates initial flow rates in liters/min/cu2 using prefiltered
     air at 10 psi differential pressure.
(d)  Bubble point values are for alcohol.
(e)  SPI Silver Membrane filters provide excellent filtration performance at
     temperatures up to 550° C /1022° F.


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