The influence of silicone resin on the mechanical properties,thermal stability,and ablation resistance of EPDM insu-lation materials was investigated through SEM,TG,DSC,tensile testing,and oxygen-acetylene ablation testing.Additionally,the ce-ramization mechanism of the carbonized layer in silicone resin/EPDM insulation materials was analyzed during the ablation process.The results show that with the increase of the silicone resin content,tensile strength and elongation at break of EPDM insulation de-crease;When the content of silicone resin is 35 phr,the thermal stability and ablation resistance of the insulation are the best,the re-sidual carbon rate can reach about 30%,and the minimum line ablation rate is 0.048 mm/s.The morphology observation shows that the char layer formed after the ablation of silicone insulation is more compact and hard,with smaller holes and better erosion resist-ance.The addition of silicone resin can effectively improve the ablative resistance of EPDM insulation.The action mechanism is main-ly the formation of silicone carbide by carbothermal reduction reaction at high temperature and the adhesion of molten state after de-composition to form a kind of ceramic structure.
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