Viscosity of several phosphate glasses has been measured under pure shear deformation mode using a sensitive optical technique in the temperature range from room temperature up to the glass transition. Two different mechanical relaxations were superposed in glasses containing molecular chains, while a single relaxation was observed in glasses without the chain. The relaxation times for the mechanical relaxation of the glasses were 10(-4)-10(-2) st the glass transition. The thermal conductivity, thermal diffusivity, and heat capacity of glasses have been determined simultaneously during the annealing or stabilization process below the glass transition using a hot-wire method. The relaxation time for the stabilization process was around 100 s at the glass transition for all phosphate glasses. Calorimetric data were also used to estimate the relaxation time at the glass transition.