Density measurements of foamed (!f) and unfoamed (!u) samples were performed using Alfa Mirage Electronic Densimeter (MD-300S) in which distilled water was used as the reference fluid. For each sample in order to minimize the error density measurement was conducted at least five times and average values were taken. In order to determine the density reduction or void fraction (Vf) Equation(1) was used while Equation(2) was used to determine the volume expansion ratio (") [3, 5, 6, 10]: