Activated Alumina is a high capacity adsorbent with a high aluminum oxide content. Its outstanding surface area and pore volume result in superior equilibrium adsorption, offering extended service life with minimal hydrothermal aging. Each tiny bead packs up to 415 square meters of internal surface area per gram. That enormous surface area works like a sponge, trapping water vapor... https://medaad.com/activated-alumina-desiccant/