Abstract Synthesis of rice husk nanosilica was carried out using hydrothermal methods at various temperatures and times their characteristics. The stages synthesis include sample preparation, synthesis, reaction temperature variations used are 120°C, 150°C, 180°C, the time is 2 hours, 4 6 hours then titrated sulfuric acid until it reaches pH 7-8. XRF analysis results showed silica (SiO2) conten...