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The glass prepared from sustainable raw materials yields interesting properties, besides the low cost and environmentally friendly. Two series of glass compositions based on B 2 O 3-P 2 O 5-Na 2 O-CaO added with bagasse (BG) and cassava rhizome (CR) were fabricated by melt-quenching technique, and their physical, mechanical and structural properties were studied. The physical properties such as density and molar volume were calculated and discussed. The elastic moduli, Poisson's ratio, Debye temperature, acoustical impedance and microhardness have been estimated based on pressure-controlled ultrasonic technique at 4 MHz frequency with normal and angle probes. It was found that the addition of bagasse and cassava rhizome leads to an increase of elastic constants, Debye temperature and microhardness of the prepared glass. Vickers hardness tester was also applied to determine microhardness of the glass using an applied load of 0.98 N. The values of microhardness obtained from both techniques were compared and a good correlation was observed. Moreover, the internal structural units of the glass samples have been estimated by FTIR. XRD spectroscopy was applied to confirm the amorphous nature in the glasses.

Glasses of system 90RWG – 10Na2O - x CrO3 (RWG stands for recycled window glass and x = 0, 0.001, 0.01, 0.1, 1 mol %) have been prepared using the melt-quenching technique. The Archimedes principle was used to measure density of the glass samples, and then these data were used to calculate their molar volumes. Ultrasonic velocities at room temperature were measured using the ultrasonic contact technique at 4 MHz frequency. Elastic moduli have been calculated. The obtained results were compared with theoretical values which were calculated from the Makishima-Mackenzie model. The glass samples were gamma irradiated using a 60Co gamma cell at the total gamma dose of 1,000 Gy. Then the effects of gamma ray on structural properties of the glasses were investigated by means of their elastic moduli. FTIR spectra were also recorded to support the result from ultrasonic contact technique. The results show that there are significant changes in number of NBO in the structural glass due to an addition of the chromium oxide and gamma irradiation.

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