The ability of molded products to absorb water was measured according to ASTM D-570 (1995). The samples were conditioned in an oven for 24 h at 50±3 °C, then cooled in a desiccator and weighed to the nearest 0.001 g. The samples were immersed in distilled water for 2 h at 23 °C and immediately weighed to determine the absorbed water. Ten specimens were used for each sample.