The hydrostatic and uni-axial pressures, and the temperature-dependence of elastic properties of a 53ZrF(4)-20BaF(2)-4LaF(3)-3AlF(3)-20NaF (ZBLAN) glass were determined by ultrasonic pulse-echo techniques. The experimental results are used to obtain elastic constants of the glass. The normal behavior of negative temperature-dependence and positive pressure-dependence of the ultrasonic velocities were observed for this glass. The pressure-derivative of shear modulus and bulk modulus, and the longitudinal and shear acoustic mode Gruneisen parameters are all positive (partial derivativeS/partial derivativeP = 0.92, partial derivativeB/partial derivativeP = 5.30, gamma(11) = 1.89 and gamma(44) = 0.83). (C) 2002 Elsevier Science B.V. All rights reserved.