Hysol GR510-HP | Black Epoxy Mold Compound

Under inert nitrogen, GR-510HP shows remarkable thermal stability, with decomposition beginning at T₅% ≈ 475 °C. The DTG peak (Tₘₐₓ) at 419 °C marks the temperature of maximum mass-loss rate (≈ 0.00115 % / °C). The total mass loss is limited to 8.13 wt %, leaving a high carbonaceous char yield of 91.87 % at 800 °C, indicating an extensively cross-linked epoxy–silica network and high filler content. The gradual, single-stage degradation profile with minimal DTG amplitude suggests a uniform decomposition mechanism dominated by the scission of epoxy backbone and filler-resin interface bonds without secondary oxidation.

In the oxidative environment, the degradation profile shifts slightly toward higher temperatures, with T₅% = 540 °C and T₁₀% = 668 °C, while the Tₘₐₓ (DTG) occurs at 428 °C with a slower mass-loss rate (≈ 0.000835 % / °C). This counter-intuitive rise in onset temperature is characteristic of systems where oxidative crosslinking or char consolidation temporarily delays volatile evolution. However, total mass loss increases to 11.91 wt %, and the residual ash yield decreases to 88.09 %, reflecting that oxidative cleavage ultimately consumes part of the carbonized structure. The result in the N2+O2 run is a more complete burnout of organic content/filler plus inorganic additives.