In order to reduce the material loss caused by the material flying in the process of mixing insulation materials and reduce the material pollution to the environment, considering that the low melting point feed bag can be mixed with raw materials and has no significant effect on the properties of the rubber compound mix and vulcanized rubber within a certain range of use. The effect of low melting point feed bag on the mechanics, ablation and vulcanization properties of EPDM insulation layer was studied. The results show that with the increase of the EVA or POE dosage, the torque difference and vulcanization rate index of the insulation layer decrease gradually, the positive vulcanization time of the process increases, and EVA or POE dose not participate in the peroxide vulcanization reaction. With the increase of the amount of POE, the tensile strength and elongation at break of insulation layer increase obviously, but the amount of EVA has no obvious effect on the mechanical properties of the insulation layer. With the increase of the amount of POE or EVA, the ablation performance of the insulation layer has no obvious change.