Abstract: This invention discloses a method and a system for measuring mechanical properties of a solid material using standard ultrasonic wave modes characterized in the solid material which forms the wave guide encased a fluid media, particularly at high temperatures, with an ultrasonic transducer placed at one end of a wave guide and to generate multiple wave modes which travel in different path along with the length and reflected a set of corresponding sensors for detecting the amplitude and time of flights, and a processor means to analyze with the detected signals.