Additionally, the composites filled with FSi
give greater thermal aging resistance due to the higher
volume fraction and greater reinforcing ability of FSi. The
results also show that MS30 samples give lower tensile
retention than M30 samples. As reported elsewhere, Si-69
containing approximately 3.8% sulfur could give additional
polysulfidic crosslinking in MS30 samples leading to
the lower thermal aging resistance [14,23].