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CoorsTek Porous Ware easily incorporates into many chemical processing, pharmaceutical, mechanical, and electronic applications. Its reliability results from years of experience, advancement, and refinement of manufacturing techniques.
In chemical filtration, CoorsTek Porous Ware can separate solid particles from liquid or gaseous suspensions. Stream flow is not obstructed by the filtering action.
For gross particle filtration, clarification, polishing, and sterilization of serums, vaccines, antitoxins, and other biochemical solutions in the pharmaceutical environment, CoorsTek Porous Ware is ideal.
Mechanical and Earth Science uses include filtration, diffusion, pressure studies, and underground containment studies. CoorsTek Porous Ware is consiered an excellent divider for electrolytic cells.
Maximum operating temperatures range from 900° to 1400°C depending upon ceramic composition selected. Variation in temperature will not affect porosity characteristics within their working temperature range.
COORSTEK POROUS CERAMICS PROPERTIES
*All listed values considered typical, not exact. Additional information regarding porous ceramics available upon request
Definitions and Test Methods (ASTM E 128)
Bubbling Pressure (or Air Entry Value):
These terms are used interchangeably. This figure (expressed in pounds per square inch) represents th air (or other gas) pressure required to displace liquid (usually water, but alcohol or other liquids can be used) from the pores of a saturated porous membrane. A saturated disc of measured diameter and thickness is placed in a fixture that allows the entire face of the disk to be expsed undre measured pressure. The opposing side of the disc is held slightly submerged and observed closely as the gas pressure is raised slowly. At some pressure one or two bubbles will appear. The pressure is noted and the pressure increased until bubbles appear substantially over the face of the disc. The first pressure represents the largest pore and the second someht near the average pore size. The pressure can be converted to pore diameter in microns by the relation:
D = 30γ ⁄ ρ
D = Pore diameter in microns (1 μm = 1x10-4
ρ = Pressure in millimeters of mercury (51.71 mm mercury = 1 psi = 27.70 inches of water)
γ = Surface tension of immersion liquid in dynes per centimeter at 20° C (Water at 20° C has approximately 72 dynes/cm surface tension, alcohol approximately 22 dynes/cm)
The volume relation of pore volume to total volume:
% Apparent Porosity = (Pore Volume ⁄ Total Volume) x 100
The weight relation between the saturated pore weight to the dry weight of the piece:
% Absorption = ((Saturated Wt. - Dry Wt.) ⁄ Dry Wt) x 100
Porous Ceramics are ideal for laboratory filtration, along with many new applications in the chemical processing, pharmaceutical, mechanical, and electronic industries.