Type A silica gel, also known as fine-pore silica gel, consists of transparent or translucent granules and is available in spherical and blocky forms. Its main constituent is SiO2•nH2O; it is insoluble in water and inorganic acids but soluble in hydrofluoric acid and concentrated caustic soda solutions. It exhibits high mechanical strength and excellent abrasion resistance. Its internal structure features a pore volume of 0.35–0.5 mL/g, a pore size of 20–40 Å, and a specific surface area of ≥600 m²/g.

This product is an important adsorbent, suitable for drying a wide range of industrial gases, including air, oxygen, hydrogen, and organic gases. It is also used to prevent moisture in instruments and meters, electrical appliances, textiles, food, pharmaceuticals, apparel, footwear, headgear, shipping containers, and various other packaged goods; for the dehydration and purification of organic products; and for regulating air humidity. Additionally, it can adsorb flammable and explosive gases such as acetylene from compressed air.