Good afternoon, silica gel is much better than PVC, because PVC has an upper limit of heat resistance and the tg value is too low. It will cause thermal deformation after long-term use, while silica gel will not reach normal temperatures unless it is thrown into a fire and burned violently. It has no impact on its physical properties, and its flame retardant effect is much stronger than that of PVC, please refer to it as appropriate. PVC is suitable for low temperature environments below 100 degrees, and silicone can withstand temperatures between 200 and 500 degrees.