Abstract The states of borate and phosphate in borophosphate glasses have been studied by several researchers (1–4). K. Takahashi (5) described that these glasses have relatively good chemical durability and comparatively high transformation temperatures owing to the presence of BPO 4 groups. In Na 2OB 2O 3P 2O 5 glass system P. Beekenkamp et al (6) showed the existence of BPO 4 in the glass by means of NMR experiments. In the present experiments physical properties, i.e. density, hardness, thermal expansion and Raman spectra, were measured on the glass series of the formula 30R 2OxB 2O 3(70−x)P 2O 5, where R 2O is Li 2O and Na 2O; and the electrical conductivity were also measured on the glass series of the formulae 30R 2OxB 2O 3(70−x)P 2O 5, 40R 2OxB 2O 3(60−x)P 2O 5 and xB 2O 3yV 2O 5(100−x−y)P 2O 5. The behavior of these properties were considered in connection with the existence of BPO 4 and BO 4 in the glasses (7).