Rectangular specimens having 5.0 cm length, 1.0 cm breadth, and 0.66 cm thickness were cut from the composite sheets. Initially, samples were weighed and immersed in water bath containing distilled water for a duration of 0–150 h. The temperature of water was maintained at 70°C, and loss of water due to evaporation was compensated by continuous addition of water. The specimens were removed from the distilled water at a regular interval of time, wiped with filter paper to remove water from surface, and weighed. The samples were re-immersed in distilled water to permit the continuation of the water sorption until saturation established. The studies were carried out at 27 and 70°C, respectively, for the calculation of mole of water uptake by the foamed composites. The mole of water uptake ("Q" _"t" ) by 100 g of polymer composite was plotted against square root of time. The "Q" _"t" value can be calculated using the following equation.