High-quality silica gel uses physical adsorption. It has a strong moisture absorption capacity and both chemical and physical stability. It is also non-corrosive, non-toxic, and harmless. The silica gel can be reused after being reactivated. Normally, the silica gel particle size is 2-4mm. And silica gel has transparent white gel (white gel type A, white gel type B) and indicating silica gel. Indicating silica gel has an indicating function. The state of moisture absorption can be judged by the change of colors. At 25°C, Rh20%, the silica gel will start to change color after absorbing moisture and completely changes color after absorbing moisture under the condition of RH50%-60%. Based on different types of indicating silica gel, the color can be changed from blue to red, orange to light green, orange to dark green, or orange to white. The reusable silica gel beads desiccant dehumidifier can be reactivated by placing into the oven for 0.5h-3 hours at 200°F-250°F (do not over 250°F). Depending on silica gel beads condition, they may take shorter than the recommended time. Please check the silica gel beads color.