Boro-phosphate glasses combine the property of phosphate glass as excellent host for rareearth oxides with those of borate glass with good mechanical strength, thermal shock and chemical attack resistance as well as water stability. Bulk boro-phosphate glasses doped with rare-earth ions, 4.5 mol% dysprosium oxide Dy2O3 and 4.5 mol% therbium oxide Tb2O3 were designed and prepared by wet preparation route of raw materials followed by melting/quenching/annealing [1]. The glass composition include also vitreous network modifiers and stabilizers namely Li2O, Al2O3 and ZnO. Differential scanning calorimetry measurements at four heating rates, from room temperature up to 950 oC using synthetic air have revealed that no significant mass change occurs during the heat treatment, as normally expected for glass samples. The step changes in heat flow signals are associated with the presence of three important effects: the first one corresponds to the glass transition effect (Tg) and is followed by two exothermic peaks, first of them more pronounced, associated with the first crystallization process (Tp1), while the second one, lower in intensity corresponds to the second crystallization (Tp2) process. The processing of the nonisothermal data was performed using the advanced thermokinetics software package. The kinetic parameters (activation energies and pre-exponential factors) were determined using both Friedman (FR) and Flynn-Wall-Ozawa (FWO) methods [2] and many other different kinetic models were used for model-fitting crystallization data analysis. Crystalline phases formed during the thermal treatment of the glass were identified by X-ray diffraction. The mechanical parameters, hardness (H), Young’s Modulus (E) and fracture toughness (KIC) of doped boro-phosphate glasses, evaluated by micro- and nanoindentation techniques, demonstrated mostly higher values in comparison with those for other phosphate glasses [3].