Effect of Activation Time on the Quality of Microwave-Activated Sago Trunk Charcoal Briquettes (Metroxylon Sagu Rottb) L. Lestari, I. N. Sudiana, S. Raharjo, L. O. M. Salam, I. W. Sutapa International Journal of Acta Material Vol. 1 No. 1 2024 DOI 10.62749/ijactmat.v1i1.9