greatly decreased with the crosslink density. This will lead to a decrease in glass rigidity. Density and molar volume increase with the addition of PbO in (PbO)x(P2O5)1x glass system [22]. The veloc ities (Vl and Vt) and elastic moduli longitudinal, shear, bulk, and Young’s show gradually increasing trend as PbO is being added into the lead phosphate glass network while Poisson’s ratio remains almost constant. The hardness of the glasses decreases from 3.35 to 2.42 and from 2.84 to 1.77 for glass A and glass B respectively as the content ofPbOis increased.Althoughtheglassesbecomesofter,itis denser as the density increase in value. The present PbO–ZnO–P2O5 glass is in the range Young’s modulus represented the stiffness of mate rials, which is related to the bonding strength between the greater the modulus, the stiffer is the material.