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 ohm-cm at 20 C (68 F)
Specific Heat: 0.558 calories/gram at 20 C (68 F)
Thickness: approximately 50 m


Retention and Flow Rates


Pore Typical Flow Rates Typical Operating Size(a) Water(b) Air(c) Bubble Temperature(e) Point(d) m 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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