- The document examines the effect of adding silicon carbide and calcium sulfate filler materials to epoxy composites reinforced with E-glass fibers. - Composites were fabricated using hand layup with varying amounts of silicon carbide and calcium sulfate. Testing showed that calcium sulfate improved mechanical properties but reduced thermal properties, while the combination of fillers improved fire resistance. - Specifically, composites with both silicon carbide and calcium sulfate exhibited lower thermal expansion, longer ignition times, shorter flame propagation times, and lower mass loss rates during burning compared to composites with only one filler type.