Scope:

For the test ASTM C866, there is a linear relationship between the filter printing time and the square of the paste layer thickness. Also known as hydraulic permeability in some spheres, the test uses the water test to determine the permeability of the clay paste. They are used in several industries like material development, railway, Fire safety, Design, Electrical equipment, mechanical and cement industry. 

Procedure:

ASTM C866 uses a range of measures for the test. The filtration rate is directly related to white goods processes such as filter pressing, slip casting, and dish drying. The water permeability through a clay water paste is the control mechanism. For the test ASTM C866, the filtration rate is directly related to the pressure of the filter press and the void fraction of the pasta layer and is inversely proportional to the square of the pasta layer. The surface of the clay, the ratio of solids to liquid in slip, and the viscosity of the water at the test temperature are noted. The clay is subjected to various tests like this wherein the end data is amalgamated to know the clay’s filtration rate. 

Video 01: Ceramic Water Filter

Specimen Size: 

ASTM C866 uses a specimen of clay whose diameter varies from 0.05 up to 10 µm. 

Data: 

The filtration rate data is stated in metric units that are to be regarded as the standard. For the test ASTM C866, the filtration rate is directly related to the pressure of the filter press and the void fraction of the pasta layer and is inversely proportional to the square of the pasta layer.

Conclusion:

The test ASTM C866 determines the rate of speed with which a water-clay-paste layer is formed from a clay-water slip under pressure filtration.