The piezoelectric ultrasonic composite oscillator technique (PUCOT) was used to measure dynamic Young’s modulus, damping, strain amplitude, and the strain-amplitude dependence of damping on three reaction-formed silicon carbide (RFSC) specimens. The data were compared with results found on NC 203 SiC. The temperatures used to conduct the tests ranged from 595-1049 degrees C, and this information complemented data collected earlier. The main results are as follows : the modulus for RFSC specimens decreases with increasing temperature over a range of approximately 350-260 GPa from room temperature to 1049 degrees C, the modulus for NC203 ranges from 450-415 GPa over the same temperature range, and damping of RFSCs is independent of strain amplitude and has little temperature dependence.