Loading Silica for Supporting Carbon Black Filler to Prevent Degradation Natural Rubber Caused DMEAsep Handaya Saputra, Tuti Indah Sari, Dadi R. Maspanger and Setijo BismoMATEC Web Conf., 333 (2021) 13001DOI: https://doi.org/10.1051/matecconf/202133313001