Narrow pore silica gel is an important adsorbent. Its inner structure is as follows: pore volume: 0. 35-0. 45ml/g, pore diameter: 20-30A, specific surface area: 600m2/g, sio2≥99%. It is widely used as a desiccant in different industrial gases, such as air, oxygen, hydrogen and organic gas, or to be used widely in the packaging field of instruments and apparatus, electric appliances, equipment, textile, foodstuff, medicine, photographic apparatus, top grade clothing, shoes and hats, containers, etc. It is also used in dehydration and purification of organic products.