The reduction in average flexural modulus values of T22 specimens that were immersed in water environments are 3.7% (15.3 GPa), 44.7% (8.78 GPa) and 79.5% (3.25 GPa) at temperatures 40 C, 60 C and 80 C respectively at the end of time period (refer to Fig. 4c). Fig. 4d shows that the reduction in average flexural modulus values for T22 specimens that were immersed in artificial seawater environments are 2.9% (15.4 GPa), 44.1% (8.88 GPa) and 73.7% (4.17 GPa) at the temperatures 40 C, 60 C and 80 C, respectively at the end of the exposure period.