Abstract
Settling method (temporarily named) for determing the clay content in moulding sand was investigated and compared with the standard method. A) The settling method : Utilizing the difference of settling velocity in water, clay and sand grain are divided in two layers. The clay content is represented in volume percentage. B) The standard method : After boiled in 0.025% NaOH solution, the sand test sample is placed in a jar. Filling the jar with distilled water, the contents are well stirred and then clay is siphoned off. Clay is determined in percentage terms of the original sampl weight. I found that the settling method had a conversible relation with the standard method under the careful measurement.
