Sitohang, T.U.S. et al. 2025. Study of the Chemical Composition of Flash Pyrolysis Products of Off-grade Rubber with Ni/Ga-SBA-15 Catalyst . Akta Kimia Indonesia. 10, 2 (Dec. 2025), 140–161. DOI:https://doi.org/10.12962/aki.v10i2.8912.