The production of rubber leaf biobriquettes was carried out with variations in activation time and adhesive type, and characterized based on the SNI 01-6235-2000 standard. The rubber leaves were carbonized using a pyrolysis reactor at a temperature range of 300–600°C for 2 hours, then ground and sieved using a 60-mesh sieve. Activation was carried out using sulfuric acid solution with time v…