Type A silica gel, also known as fine-pore silica gel, appears as transparent or semi-transparent particles. It is categorized into spherical and irregular block forms. Its primary component is SiO?·nH?O, which is insoluble in water and inorganic acids but soluble in strong acids and alkalis. It exhibits high mechanical strength and excellent wear resistance. Its internal structure features a pore volume of 0.35–0.5 ml/g, pore diameter of 20–40 ?, and a specific surface area of ≥600 m2/g.

This product is an important adsorbent suitable for drying various industrial gases such as air, oxygen, hydrogen, and organic gases. It is also used for moisture protection in instruments, electrical appliances, textiles, food, clothing, footwear, containers, and various packaging materials. Additionally, it is applied in the dehydration and purification of organic products, air humidity regulation, and the adsorption of flammable and explosive gases like acetylene from compressed air.