The Effect of Silica Filler Source on the Mechanical Properties of Composite RubberIsrenna Ratu Rezky Suci, Anisa Ur Rahmah, Eni Budiyati and Herry PurnamaE3S Web of Conf., 517 (2024) 12006DOI: https://doi.org/10.1051/e3sconf/202451712006