Puspitasari, S. and Cifriadi, A. 2022. Carbon Black and Lignin Hybrid Filler in Designing NR Based Cushion Gum Composite Formulation. Journal of Engineering and Technological Sciences. 54, 2 (Mar. 2022), 220213. DOI:https://doi.org/10.5614/j.eng.technol.sci.2022.54.2.13.