EWP (0.5 g) was put into centrifuge tube, successive to add water, stirring with glass rod. Sufficiently dissolve
EWP until performing saturation when no water was separated out. The solution was centrifuged (3,000 r/min) for
20 min and discarded supernatant. Add water again when supernatant could not be observed. Calculate the quality of
abstracted water of EWP which was EWP hydratability,showed as formula (2).